6GT Project/Range Report

reubenski

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Ok anyone know when the 2nd batch of Alpha brass is going to be in and will be able to buy? Hopefully they are not all already sold out through pre orders.

I figured I’m gonna try some myself and see what I find out.
I called GAP earlier last week to clarify my order. i pre-ordered on Batch 2. I was told they were finalizing batch two and it would be shipping to them "next week". So in summary, "I thought you said 5 mins, 5 mins ago?".

I ordered 200pcs of Hornady brass to hold me over until the Alpha brass becomes more available.
 

NorCal Vu

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My problem with the GT is brass. Hornady is junk after a few firings and it’s not consistent. Alpha has had all kinds of problems as well and their brass runs into pressure problems before you get desired speed.

This caliber seems to be almost the perfect combo but man we need the brass giant to pick it up.
You worry too much. We have 4 GTs online hammering away on Hornady brass. One guy ran a 115 DTAC up to 3000FPS with Stabal and the primer pocket is still solid.

68cents, single digits SD and ES, don't care if I lose a few pieces at a match, and can buy in bulk without breaking the bank.

If you really want Lapua made GT brass, just make it.
 

Darqusoull13

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Got a chance to shoot a friend's 🌈 🐯 over the weekend and I'm sold. Shot it back to back with a 6 Creed, 6 Dasher and 6 pre-Dasher (BRA). I perceived less recoil in the GT and I was able to watch the hole appear in the paper at 100 yards. Talking to the owner, the load seems to be common among many shooters as a great node.

IMG_9248.JPGIMG_9352.JPG
 

Kadams1563

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Got a chance to shoot a friend's 🌈 🐯 over the weekend and I'm sold. Shot it back to back with a 6 Creed, 6 Dasher and 6 pre-Dasher (BRA). I perceived less recoil in the GT and I was able to watch the hole appear in the paper at 100 yards. Talking to the owner, the load seems to be common among many shooters as a great node.

View attachment 7181859View attachment 7181860
What bullet?

And you say it has less recoil then a BRA???

One thing that’s keeping me away from the BRA is the bolt lift. I have compared 6Creed and 6BRA side by side and the BRA always has a little more bolt lift to it.
 

4RingShooter

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Running similar sized cases with one at a lower pressure than the other will have a perceived lower recoil, especially reducing the initial pressure spike. A smoother push will feel softer than a sharper initial spike which is what you get with higher pressure. Most people I know run the BRA at higher pressures than most other cases.
 
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Darqusoull13

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What bullet?

And you say it has less recoil then a BRA???

One thing that’s keeping me away from the BRA is the bolt lift. I have compared 6Creed and 6BRA side by side and the BRA always has a little more bolt lift to it.
Berger 105's in all. I did not notice a difference in bolt lift between any of the cartridges despite running the GT wrong handed. I've been told I'm a blunt instrument though so take that with a grain of salt.

Let me clarify my perceptions and the points raised in the above posts. My post was certainly an over simplification of everything happening in these cases as obviously pressure and gas volume, in addition to the above noted bullet weight and powder charge, affect the recoil characteristics of braked rifles.

Those complex physics aside and taking into account this is only my reported perception, as closely as things could be held consistent as far as action (Impact), stock (Foundation) and bullet, the GT reigned supreme for me. That for me is exceptionally subjective admittedly but I'm 100% sold on the GT. I don't have any outside influence toward the GT, technically the opposite might be argued, for nearly all the above information but to me it's the real deal.
 
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Darqusoull13

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I'm thinking things like total rifle weight, brake, how the stock fit you, etc. had more to do with recoil than 🌈 🐯
I hear what you're saying but actually the opposite. Same stock, similar barrels etc. The 🌈 🐯 belonged to a short, heavy lefty (Wrong-handed dwarf?) and the BRA/6 Creed were a tall lanky guy like me whose guns actually fit me.

Brake certainly had a role but either way I'm sold.
 

Niles Coyote

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Brand new bartlien from impact arrived. Fired some pairs into my bullet trap collecting velocity only.

On new Hornady brass.
20191115_132741-1.jpg

On fresh once fired
20191116_135627-1.jpg

I'll add, this hornady brass is only needing to grow .002 to .003 in the shoulder from new, unlike some new brass I've used for different calibers. That should help with first fire accuracy...
 
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47guy

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Brand new bartlien from impact arrived. Fired some pairs into my bullet trap collecting velocity only.

On new Hornady brass.
View attachment 7184284

On fresh once fired
View attachment 7184285

I'll add, this hornady brass is only needing to grow .002 to .003 in the shoulder from new, unlike some new brass I've used for different calibers. That should help with first fire accuracy...
is the hornady brass small or large primer?
 

I SHOOT

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Brand new bartlien from impact arrived. Fired some pairs into my bullet trap collecting velocity only.

On new Hornady brass.
View attachment 7184284

On fresh once fired
View attachment 7184285

I'll add, this hornady brass is only needing to grow .002 to .003 in the shoulder from new, unlike some new brass I've used for different calibers. That should help with first fire accuracy...
What are the barrel specs length and twist please
 

Niles Coyote

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@NorCal Vu your 33.5gr varget shoots well in my barrel as well, 700 yards 6 rounds 2.5" vertical.
20191118_130524-1.jpg

Working up at 200 yards, one inch dots, barrel is still settling in per my velocity swings just prior to these so I wouldn't read to much into ES. Also, lower right says 40, it should read 37 ;)
20191118_131521-1.jpg
 
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Kadams1563

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Damn GT Redding dies are expensive as shit!?

looking for a reamer and then I will be chambering up a GT on an Impact.

have quite a bit of H4350 so will be using that with 108 ELD’s most likely. Hopefully I’ll get in the second batch of Alpha brass AND it runs well.

I will be coming from a 6.5 creed so that will be interesting to see the recoil difference.
 

47guy

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Damn GT Redding dies are expensive as shit!?

looking for a reamer and then I will be chambering up a GT on an Impact.

have quite a bit of H4350 so will be using that with 108 ELD’s most likely. Hopefully I’ll get in the second batch of Alpha brass AND it runs well.

I will be coming from a 6.5 creed so that will be interesting to see the recoil difference.
youll be way happier with a 6mm.
 

Kadams1563

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Does anyone know if the GT should use the .375 Hornady headspace gauge?

that’s my best guessanyway.

Also what starting load should I start with H4350 and 108 eld’s?
 

Rthur

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Damn GT Redding dies are expensive as shit!?

looking for a reamer and then I will be chambering up a GT on an Impact.

have quite a bit of H4350 so will be using that with 108 ELD’s most likely. Hopefully I’ll get in the second batch of Alpha brass AND it runs well.

I will be coming from a 6.5 creed so that will be interesting to see the recoil difference.
Have been using the RCBS match master per Ken's recommendation.
Liking them so far.
Have many sets of Redding.
I think they are as good.

R
 

Dthomas3523

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I apologize if I missed this. Have a few questions for measurements if forming brass from lapua.

About how far back you bump shoulders.....what is the rough measurement you need to be below from base to shoulder on a bump/headspace gauge?

Then, what OAL do you cut with saw and then trim down to?

What size do you turn necks to?

Or if all these steps with measurements are somewhere, please let me know.

Thanks!
 

samb300

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I apologize if I missed this. Have a few questions for measurements if forming brass from lapua.

About how far back you bump shoulders.....what is the rough measurement you need to be below from base to shoulder on a bump/headspace gauge?

Then, what OAL do you cut with saw and then trim down to?

What size do you turn necks to?

Or if all these steps with measurements are somewhere, please let me know.

Thanks!
With Hornady available now, and the 2nd batch of Alpha shipping out, why would you convert Lapua brass???
 
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NorCal Vu

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I apologize if I missed this. Have a few questions for measurements if forming brass from lapua.

About how far back you bump shoulders.....what is the rough measurement you need to be below from base to shoulder on a bump/headspace gauge?

Then, what OAL do you cut with saw and then trim down to?

What size do you turn necks to?

Or if all these steps with measurements are somewhere, please let me know.

Thanks!
PM me. I can help ya out.
 
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Niles Coyote

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@reubenski my test target was a mess today, likely me but there appears to be a node in the 37.5-37.7 area, 37.6 had me doing 2948. 38 grains gave me 2977.

I also narrowed down my lower velocity node to 36.4 or 36.5. I shot 3 groups of ten 36.3, 36.4 & 36.5 and I'm pretty sure my barrel sped up at 36.4 as my ES was huge and it showed on the 700 yard plate. 36.5 settled back down with 5.75" of vertical for ten shots, see below. Velocity on that group (unfired hornady brass)
2859 sd5/18es
20191120_090119-1.jpg

Compression can be heard when loading anything above the mid 36 grain area with RL-16 and that's with a 7" drop tube. And while more prominent at 38 grains it still was seating to the same depth for all loaded rounds.

I'll be verifying both 36.4-36.6 & 37.5-37.7 at distance in the next few days.

Then I'll move on to test Stable6.5...
 
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Niles Coyote

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Data points with StaBall6.5 and Temperature stability in the 6mm GT case.

The load:
New Hornady cases, CCI 450 primers, 40.50 grains of powder, 115 Dtac's seated .030-.032" off the lands.

Procedure:
Ammo was exposed to temperature for 4.5 hours, then rapidly discharged within one minute of removal from each temperature source.

Because I was starting with a clean cold bore I discharged 5 rounds at 4 degrees, 3 rounds at 67 degrees and 3 rounds at 107 degrees. While some may call the number of rounds used into question, it still gives a baseline and I plan to follow up once I find the load I plan to use with this powder.

Results collected by magnetospeed:
4*
2937, 2951, 2923, 2951, 2939= 2940 sd11/28es
67*
2977, 2976, 2983= 2978 3/7
107*
2999, 2992, 2986= 2992 6/12

4 to 67 equal .6fps per degree.
67 to 107 equal .35fps per degree.
 

Niles Coyote

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Confirmed my low velocity node today with RL16 and 115 Dtac's as 36.6 grains for 2871 sd 4/13 es. Looking at past targets and notes would place my high node at 37.7 with a velocity between 2948 (37.6) & 2962 (37.8)
 

Skyking

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Have 300 rounds down the barrel now. Shot one local match with the gun. Liking the round so far. I have tried varget, H4350 and staball. One time out with staball gave up. Accuracy wasn't there and didn't want to mess with it too much. Shooting the Regional finale tomorrow. I have tried it get the Barnes 112 to shot but can't get them to group. 20191119_103329.jpg

My load is 37 H4350 Berger 105 cci br2 hornady brass. 3015 fps. 200 yard groups. 20191120_165214.jpg

20191120_165219.jpg
 

reubenski

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I'm still waiting on a barrel but I have everything else. I loaded a DTAC and a 105 Hybrid to George's published COALs. It looks a little better for the Hybrid than I thought it would. I've been shooting a Dasher for three years and a 6 Creed for about 18 months. This cartridge looks like the perfect size in comparison, especially for general purpose barricade matches. I hope performance matches looks.
 

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B-P-UU

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I'm still waiting on a barrel but I have everything else. I loaded a DTAC and a 105 Hybrid to George's published COALs. It looks a little better for the Hybrid than I thought it would. I've been shooting a Dasher for three years and a 6 Creed for about 18 months. This cartridge looks like the perfect size in comparison, especially for general purpose barricade matches. I hope performance matches looks.
Are those 2 different brass manufacturers as well?
 

gonzaga

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Very interesting read. I've got a defiance action that I have been looking at getting barreled into this caliber.
 

Kadams1563

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What’s a good starting load for H4350 and 108 eld’s?

also have any if you had the 108 ELD’s not shoot well down range?
 

47guy

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What’s a good starting load for H4350 and 108 eld’s?

also have any if you had the 108 ELD’s not shoot well down range?
i have...ive never had any luck with hornady bullets...the 140ELDMs shot ok in my 6.5x47 but not well enough to continue using.
 

Kadams1563

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i have...ive never had any luck with hornady bullets...the 140ELDMs shot ok in my 6.5x47 but not well enough to continue using.
i have been shooting 140 eld for 6.5 cm with great results. Never noticed anything wonky out of all the matches I have shot. Reading about the 108’s though people are reporting that they don’t shoot.

haa me worried on what Bullets to buy. I don’t enjoy spending money on Berger.
 

47guy

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i know a couple guys shooting the 140s and like them they just never shot up to my expectations...the 108ELDs i shot 30 of them and that was enough.
the only bullets ive shot the will shoot better than bergers are the 105g infinitys but at $253 bucks a box ill stick to the bergers.
you want easy to load and stupid consistent get yourself a 100 108g bergers and load them .025 off and run a charge test and ill bet around 2950 and 3050 youll buy more...smallest groups ive ever shot at distance were 108g bergers.
 

Kadams1563

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I used 37-38.4 grains of H4350 with 115's and didn't have any pressure signs. I'd feel safe using that with 108s as well. 47.6-48 looked most promising.
Uhh you don’t mean 47 grains do you? I don’t think that would fit.

I’m gonna go ahead and assume you meant 37.6-38 lol