6XC Loads

drwood96

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What sizing die is everyone using for the 6XC II chamber? I dont see any list. Are they custom order?
 

paproctor8

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Jul 5, 2018
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Most of the 6XC dies you see for sale nowadays are appropriate for the 6XC II. I have both a Forster and a Tubb 6XC die (stock specs) and they both work perfectly for all of my 6XC II rifles using any brass (Norma, Alpha, and Peterson are what I've used so far). I also have a custom-made 6XC II die based on my reamer spec, but in retrospect that was totally unnecessary.
 

mustang-cars

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Most of the 6XC dies you see for sale nowadays are appropriate for the 6XC II. I have both a Forster and a Tubb 6XC die (stock specs) and they both work perfectly for all of my 6XC II rifles using any brass (Norma, Alpha, and Peterson are what I've used so far). I also have a custom-made 6XC II die based on my reamer spec, but in retrospect that was totally unnecessary.
Do you know your measurement for a loaded round with 6xc Alpha SRP brass? I'm asking because my gunsmith uses a reamer that has the right body diameter but the neck on the reamer is only .273 and Alpha recommends a .274-.276 neck. I would like to have at least .003 clearance for the neck in the chamber.
 

paproctor8

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My loaded necks measure 0.271 with Alpha SRP brass. I have the standard JGS 6XC II - LT reamer, which has 0.276 neck.
 

mustang-cars

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My loaded necks measure 0.271 with Alpha SRP brass. I have the standard JGS 6XC II - LT reamer, which has 0.276 neck.
How’s the Peterson SRP necks measure loaded? How’s it hold up. Is all of the Peterson 6xc SRP brass the same. I heard the first lots were soft. I see Tubb carries it as well as other places and just want to know if it’s the same quality everywhere
 

paproctor8

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Loaded necks always measure 0.2710" with either Alpha SRP or Peterson SRP (unturned necks). This is with calipers that only go to 0.0005" increments.

I bought 800 of the first lot of Peterson 6XC SRP brass from Grafs before I heard about it's issues, thinking "oh man 40 cents each what an awesome deal let me click right away and buy this!".

Despite all I have heard and read about that first batch of brass being soft, having low capacity, etc, I am actually very pleased with it. The stuff shoots 0.3 MOA groups and lets met get DTACs to 3010 fps (accuracy node for me) without any pressure signs in my 6XC II chamber. I've won several PRS matches with it. I've got five or six stout firings on all of it and not a single pocket has loosened, case separation, neck split, etc. I do anneal in between each firing though.

I weighed 100 Peterson cases and found the standard deviation was three times higher than it was for Alpha brass (and that was actually two intermixed lots of Alpha). It sure doesn't show in shooting though.
 

OLD308

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Again I ask as someone looking hard at building a 6xc. Why does it seem that so many are going against the specific recommendations of the creator of the round? I understand some items suggested bring direct money back to SSS. But that’s the least of the variations I see.

1)Suggested reamer does not cost more or less than other reamers.

2) suggested LTP Peterson brass does not cost more or less than other brass. Actually cheaper through SSS. LRP lasting just as long as SRP per the people I shoot with.

3) suggested powders and FPS recommendations not adhered too. My understanding form SSS (2950) was this was to extend barrel life with maximum accuracy

4) Neck turning when the Peterson and suggested reamer eliminate the need.

I don’t own this cartridges. I do shoot with some that do. Just trying to do my do diligence before purchase. Thanks.
 

Dthomas3523

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Again I ask as someone looking hard at building a 6xc. Why does it seem that so many are going against the specific recommendations of the creator of the round? I understand some items suggested bring direct money back to SSS. But that’s the least of the variations I see.

1)Suggested reamer does not cost more or less than other reamers.

2) suggested LTP Peterson brass does not cost more or less than other brass. Actually cheaper through SSS. LRP lasting just as long as SRP per the people I shoot with.

3) suggested powders and FPS recommendations not adhered too. My understanding form SSS (2950) was this was to extend barrel life with maximum accuracy

4) Neck turning when the Peterson and suggested reamer eliminate the need.

I don’t own this cartridges. I do shoot with some that do. Just trying to do my do diligence before purchase. Thanks.
Same questions I had and couldn’t find the answers to. At least enough to sway me.

I ordered dies and reamer from Tubb. Figured it was easier to just do everything according to his specs/recommendations.

As you said, the cost isn’t any greater than any other 6mm round. Might as well go with tubb’s recommendations.
 

OLD308

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Yea, I don't understand it. I can't find anyone out side SSS that can answer my questions or provide a critical evaluation of an alternative that holds merit. I'm not married to the idea of the 6xc, it just continually checks the most boxes with me. I would easily entertain others if I could get non fan boy imputes. So for now, Ive got the action, stock, trigger, barrels (04), DBM, and what not just collecting dust till i find a 6mm to go with. Not in a rush, but would like to get started.
 

dbenner1184

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I am very new to the 6xc however I ordered a bartlein barrel from area 419 last week and had it chambered for 6xc. When I spoke with Craig from area 419 he told me their chambers are set up for Alpha SRP with berger 105 hybrids. I ordered Alpha brass and hybrids and will have the barrel installed this friday. Craig said he had thousands of rounds down range with their barrels and chambers and actually gave me load data for it over the phone. I will update next week once I get some ammo loaded up for it.
 

OzzyO20

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I’ve tinkered with a lot of different components. Tubb had it right from the get go. H4350, Norma LRP brass, Fed 210M, 115 DTAC. 2,888 SD 5.2.
 

OLD308

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I am very new to the 6xc however I ordered a bartlein barrel from area 419 last week and had it chambered for 6xc. When I spoke with Craig from area 419 he told me their chambers are set up for Alpha SRP with berger 105 hybrids. I ordered Alpha brass and hybrids and will have the barrel installed this friday. Craig said he had thousands of rounds down range with their barrels and chambers and actually gave me load data for it over the phone. I will update next week once I get some ammo loaded up for it.
Thanks for the heads up. Can you expand on why your going against the inventors suggested reamer, brass, bullets, etc. Again just looking for information, not judging.
 

b6graham

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Thanks for the heads up. Can you expand on why your going against the inventors suggested reamer, brass, bullets, etc. Again just looking for information, not judging.
because they are just suggestions. they work. but so do dozens of other combos. Tubb is good, but he doesnt know the ONLY way to do 6XC. if he did, then why do we have a 6XC II, RBT DTACs, ATR. those are all second gen products.

also, the way Tubb comes off, it is as if there is no other way. I guess when you won what he has and build what he has, you can do that.

105 v 115. H4350 v H1000. Norma v Peterson v Alpha. They all shoot 2950-3050 with moderate loads and good barrel life
 

Hoyt7mm

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Anybody have any data on RL-23 with 110s or 115s? I saw the thread below this one, but wondering if anyone has bit more extensive experience vs just beginning to experiment?
 

dbenner1184

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Thanks for the heads up. Can you expand on why your going against the inventors suggested reamer, brass, bullets, etc. Again just looking for information, not judging.
The reason I personally went the area 419 route was that 1. They had a barrel blank in stock, and could have it to me in two weeks. 2 Craig at area 419 has had thousands of rounds through said barrels and those chambers are cut to what alpha brass suggests and knows its works. I guess I didn’t look at 6xc any differently then I would have if I was doing a 6BR or 6creed. Order a barrel get it spun up and then find a load it likes. Like I said I’m no pro of any of these cartridges I’m learning as I go as well. I’ll let you know how the barrel shoots first thing next week as soon as I get some load development done.
 

hacabrera071

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I have been using RL 16 in my 6XC all season and am very happy with the results, which are the same for three consecutive barrels now. Accuracy no worse than H4350 and H4831sc (which were both excellent), and I have not experienced any practical issues with the often-mentioned fact that the powder burns "dirtier" than others. Just clean your brake after each match and follow same barrel cleaning as with other powders.

Speed is better though. I found a node with 105 hybrids at 3160 fps (39.8 gr RL 16) that I cannot reach without mild pressure signs using H4350. I tested RL 16 up to 3230 fps just to explore where pressure would show up and had just barely flattened primers but no sticky bolt. This is with the 105s loaded so that the BT/bearing surface junction is about 1/3 of the way from the neck/shoulder junction, so keep in mind that my safe loads may be significantly higher than yours and follow appropriate safe load workup on your own rifle.

With uncoated DTACs I can push velocity to 3070-3080 before seeing pressure signs, but it shoots best at 2980 fps which is a node that I can also reach easily with H4350 or H4831sc.

My setup is:
6XC II chamber
28" Bartlein 7.4 twist
Peterson small primer brass
CCI 450s
115 DTACs (uncoated) or 105 hybrids

98Vandal I hope you find this useful.
Sir, what would you say the SD is with that load?

I got a 6xc(II) [bartlein 26" 1:7], running 105 hybrids, 38.7gr of H4350 on Alpha munitions brass and CCI 200 Large pocket primers and I get about 3050 fps on average, but my SD is about 15, which I'm not happy with... If you were on my shoes, where would you start troubleshooting the high SD number? The reason I'm doing 38.7 is because when I did ladder testing 38.7 seemed promising, but now I wonder if I should go back to ladder testing to reconfirm 38.7 is a good node....

Thanks in advance!
 

98Vandal

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My testing this last week had me comparing RL 16 and H4350. The bullets I tested were 1. 105 gr Berger Hybrid 2. 108 gr Hornady ELD-M 3. 110 gr Sierra Match King. I loaded charges from 38.2 gr to 39.6 gr (I increased charge weight by 0.2 gr per round tested and covered 8 rounds per powder with this test). All bullets were seated identically off the lands (0.010") to best represent as much control as one can during such a comparison/experiment.

Across the spectrum RL 16 proved to be the more energetic propellant when compared to identical charges of H4350; my results across the board favored RL 16 with a 1.45% to 1.91% increase in velocity (variance was greatest with lowest charge weight and least with greatest charge weight). In addition to a velocity increase, I actually observed a slight edge to the RL 16 in accuracy (I'm certainly not snapping the chalk line on this and considering it to be the final answer on accuracy but I am contributing to the conversation). I also fully recognize that the inventor of the cartridge did significant research, development, and testing in the creation of the 6 XC cartridge and his data is freely available for all to benefit from but enjoy the opportunity for we shooters to build upon an amazing cartridge in the pursuit of capturing its full potential.

Of note, I didn't get my 115 gr DTACs tested but will do so in the near future. The 115 gr DTAC appears to be the "Gold Standard" and I look forward to what that test will provide in both quantitative and qualitative data.
 

OLD308

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I would guess that DT pushes H4350 due to the temp swings here in the Lone Star state. Yes, you leave a bit of speed on the table, but you avoid pressure issues and redoing your load every weather swing. That is a big issue down here for us year long volume shooters. Not so much when I was on the east coast.
 

RoterJager

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I have been using RL 16 in my 6XC all season and am very happy with the results, which are the same for three consecutive barrels now. Accuracy no worse than H4350 and H4831sc (which were both excellent), and I have not experienced any practical issues with the often-mentioned fact that the powder burns "dirtier" than others. Just clean your brake after each match and follow same barrel cleaning as with other powders.

Speed is better though. I found a node with 105 hybrids at 3160 fps (39.8 gr RL 16) that I cannot reach without mild pressure signs using H4350. I tested RL 16 up to 3230 fps just to explore where pressure would show up and had just barely flattened primers but no sticky bolt. This is with the 105s loaded so that the BT/bearing surface junction is about 1/3 of the way from the neck/shoulder junction, so keep in mind that my safe loads may be significantly higher than yours and follow appropriate safe load workup on your own rifle.

With uncoated DTACs I can push velocity to 3070-3080 before seeing pressure signs, but it shoots best at 2980 fps which is a node that I can also reach easily with H4350 or H4831sc.

My setup is:
6XC II chamber
28" Bartlein 7.4 twist
Peterson small primer brass
CCI 450s
115 DTACs (uncoated) or 105 hybrids

98Vandal I hope you find this useful.
What powder charge are you using with the DTACs?
 

98Vandal

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I've just finished testing the 115 gr DTACs with H4350 and RL 16 and, again, RL 16 pushed them faster by 0.21% (39.0 gr) to 3.27% (38.4 gr). At 39.6 grs (the farthest that I'm willing to go at this point), RL 16 pushed the bullet at 3035 fps while H4350 achieved 2968 fps. I appreciate the work of people like paproctor8 as his insight and detail has provided me a foundation to work with. I am unlikely to try and push the bullets much faster than what many of the more seasoned members and DT recommend. I'm finding great accuracy with what I've accomplished thus far and am still doing a bit more tweaking before I settle on a final load. Regardless, I really appreciate all the dialogue/feedback this thread has generated as it prevented me from starting from zero.
 

Dthomas3523

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I would guess that DT pushes H4350 due to the temp swings here in the Lone Star state. Yes, you leave a bit of speed on the table, but you avoid pressure issues and redoing your load every weather swing. That is a big issue down here for us year long volume shooters. Not so much when I was on the east coast.
Yes and people are figuring out that you don’t need to be pushing every bullet as fast as possible.

Ask @JC Steel how fast he’s pushing his bullets.
 

JC Steel

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Yes and people are figuring out that you don’t need to be pushing every bullet as fast as possible.

Ask @JC Steel how fast he’s pushing his bullets.
I like to run SLOW!!
Stay way away from pressure, accurate, never have problems(knock on wood), and the slower the bullet the more I get to watch them fly through the air. Which in some matches is a big advantage.
 
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