6 Creedmoor Freebore - .120" with various bullets

reubenski

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I'm having a 6 Creed chambered. My smith seated a 115 DTAC and sent it off to have a reamer made. They responded back quickly that they already had a reamer for this. It is a .120" I see a lot of misinformation on the internet about 6 Creed freebores and thought I'd post pics of all of the bullets I've measured. My smith chambered a barrel stub with the reamer and I used a split neck case to push the bullet into the case seating the bullet against the lands into the neck. When I remove the case you can see where the bullet will sit in the neck at the lands in a .120 FB. I marked the the body/ boattail junction with a thin black permanent marker. You can see it in contrast to the neck shoulder junction which I also marked. Thought it would be helpful for folks.



115 DTAC


105 HYBRID


108 ELD M


103 ELDX


107 SMK


110 SMK


95 TMK


87 VMAX


75 VMAX


95 Nosler BT


105 BTHP


108 Berger BT
 
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Geno C.

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Looks like a winner to me. Since a dtac was sent in, I assume that's what you want to be shooting. There is a big difference if you wanting to shoot light bullets
 

jpndave

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[B]reubenski[/B] Thanks for posting this up, extremely helpful information. I am looking for a reamer to chamber a custom lever rifle in 6 Creedmoor and don't want the excessive throat of SAAMI spec reamer.

There is a 0.275 neck 0.109 PT&G reamer readily available but I'm not certain I want to go that tight on both of those dimensions. I am planning Atlas brass (Loaded Diameter .271" Dia. Tolerance +/- .0005) and 108 ELD-M, hopefully. Mags are modified to accept ~2.91 max COL. What company had/has the 0.120 throat reamer you used in stock? Do you know what the neck diameter is?
 
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reubenski

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[B]reubenski[/B] Thanks for posting this up, extremely helpful information. I am looking for a reamer to chamber a custom lever rifle in 6 Creedmoor and don't want the excessive throat of SAAMI spec reamer.

There is a 0.275 neck 0.109 PT&G reamer readily available but I'm not certain I want to go that tight on both of those dimensions. I am planning Atlas brass (Loaded Diameter .271" Dia. Tolerance +/- .0005) and 108 ELD-M, hopefully. Mags are modified to accept ~2.91 max COL. What company had/has the 0.120 throat reamer you used in stock? Do you know what the neck diameter is?
After having a .120 and a .130 I think a .140 or so would be about perfect for 115 DTACs. The .109 would definitely stifle that case. BUT... you could purchase a hand-throater to go with it and throat it out as you like. As far as the neck diameter a .275 is pretty standard for these big 6's. My Dashers and BRs are at .268" on a loaded neck. My SLR and Creed are .270 loaded. I think a .275 would be good.
 

FishDr

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Excellent Post. I wish I had seen this before I had a 6 CM chambered up. WIll probably wind up running the DTAC, but I WANTED to run the 105 RDF. But maybe next year.... they still burn quickly! Great info. Thanks Reubenski
 
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jpndave

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Thanks for the clarification reubenski

I will not be shooting DTACs (hunting application). It looks like all of the other bullets would benefit from the shorter throat to place the boat tail/shoulder junction in a better place. My preference is the 108 ELD-M if the barrels likes it.

By stifling the case I suspect you mean that the DTAC is down into the powder column and compromising powder capacity especially with slower powders?
 

reubenski

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Yes. I have a hunting rifle in .120 FB. 22" Proof Carbon. I maxed out on pressure using Peterson brass and 105 class bullets at 2850 using 4831SC. I shoot 95gr TGKs at 3050 using 40.5gr H4350. 95gr Berger Classic Hunters are at 3000fps with 40.3gr. IIRC I got 2950 with Berger 108BTs using 4350. Definitely a little on the anemic side. That Peterson brass is super thick and seems to pressure fast. I also can't rule out that barrel. It is picky as hell and slow.

But yes, I would agree for light hunting bullets the shorter FB would be best. If you have any designs of shooting Vmax's you must have a very short FB or jump them two miles. Ironically I have found the 95 TGKs to be so explosive I don't think I'd need a Vmax for varmints
 
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jpndave

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I have heard that about the Peterson brass. The Alpha is supposed to be more case capacity and hopefully will allow better fill. I think Lapua is similar also. I'm really torn on this throat issue, seems to be a very large range in some of these new bullets.

I've seen the 90gr TGK and a 95gr TMK. Haven't seen a 95 TGK. So much for controlled expansion if they are that explosive.
 
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reubenski

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I have head that about the Peterson brass. The Alpha is supposed to be more case capacity and hopefully will allow better fill. I think Lapua is similar also. I'm really torn on this throat issue, seems to be a very large range in some of these new bullets.

I've seen the 90gr TGK and a 95gr TMK. Haven't seen a 95 TGK. So much for controlled expansion if they are that explosive.
You are correct. It's a 90gr bullet.

I bought 100rds of each, Peterson Lapua and Alpha. The first two were pretty similar. Alpha measured well and had more capacity. I use Alpha in my match barrel.
 
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jpndave

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Sounds like Alpha is the way to go. I'm hoping for 3000fps+ out of a 22" Bartlein 8-1/2 to 7-1/2 twist using the 108 ELD-M and RL26 in Alpha SRP brass.
 

jpndave

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That damage is insane for that bullet. What was that critter? How far/fast was the impact?

That looks awesome for varmints, not so much for bigger stuff depending on how far it penatrates.
 

reubenski

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That damage is insane for that bullet. What was that critter? How far/fast was the impact?

That looks awesome for varmints, not so much for bigger stuff depending on how far it penatrates.
It was a whitetail at about 20yds. Big doe. I hit her once walking. She ducked her head and picked up her pace so I hit her again and it knocked her off her feet and she died instantly. I think what you're seeing is the second bullet; it hit a rib. The other bullet just entered, thru, and exited. Kind of a night and day difference. Not overly impressed with the bullet but I think it really speaks to how variable bullet performance can be.