I think I'll build a 7mm Creedmoor AR.

[thefitter]

I have a 6.5mm Creedmoor AR and the more I think about it the 7mm could be better.

Less drift, drop and more punch...whats not to like?

Any thoughts, opinions or incoherent ramblings about the idea?

 

[jscandale]

I'm assuming you mean AR10, right?

JS

 

[thefitter]

I'm assuming you mean AR10, right?

JS

That's a big 10-4 rubber duck!

 

[brian427cobra]

Going down .020 to 6mm makes a great cartridge capable pushing a 105 to 3125fps with match winning accuracy, but going up .020 to .284 I doubt there is enough case capacity to a 162amax to velocities that will make it worth the trouble.

 

[holstil]

I think a good high BC 150 class bullet would make this look even better. I know those Lapua bulltes are going to break the bank. Sure wish Berger would step up the hybrid program. It would be a shot in the arm for the 7-08 and such.

 

[thefitter]

Going down .020 to 6mm makes a great cartridge capable pushing a 105 to 3125fps with match winning accuracy, but going up .020 to .284 I doubt there is enough case capacity to a 162amax to velocities that will make it worth the trouble.

Don't think I can get 3125fps out of a 22" gasser.

I'm thinking the Berger 168 @ 2600 will be easy to do and easy on the barrel. More drop yes, but less drift and 40% more energy at 1000yds

Thanks

 

[jscandale]

Is this a target rifle or varmint? I'm guessing a varmint rifle.

JS

 

[gunsandgunsmithing]

Why not a 7mm-08? I think 2600 may be a tad optimistic from the creedmore. 7mm-08 will add a couple of grains capacity, and you could gain 2-3 more from improving it. FWIW--Mike

 

[thefitter]

Target shooting

7mm -08 was the original plan but then I thought about doing something a bit different.

2600 could be a bit optimistic, but really 2500-2600 is fine.

I was even going to try the ultimate 7mm bullet- Berger 180 Hybrid and see what it does.

 

[gunsandgunsmithing]

I think the heavies will be too slow to realize the bc advantage. Heavier bullets compound capacity issues. It's close...I've considered doing a 7x47 for a while, but I'd be shooting lighter pills. Try it..I think a 7mm08 improved will clean up the chamber if it doesn't quite give the speed you're after. Not much to lose, but things like brass and dies are considerations. I know they're available, but it's hard to beat the versatility and availability of components for a .308 based round.
It may work great. Let us know, if you go that route.--Mike

 

[jscandale]

If target shooting is the purpose for a gas gun, the 6mm or .22 cal is a super way to go. Although the 7mm offers the best bc bullets and would be a great choice in the .284 Win and larger, the smaller calibers really do offer significant advantage in the way of inherent accuracy and little recoil.

I shoot across the course and some F class, but prefer to use a gas gun almost exclusively. I have used the 6mm Hagar and my own .240 Tomahawk with excellent results, but I have permanently moved to the .220 Thunderbolt, which is the .22 cal version of the 6mm Hagar. I allows you to shoot the .22 cal heavies (77, 80, 85, 90) at 3000 fps+, with mid blowing accuracy out to 1000 yds. I have also built several .240 Tomahawks ffor guys who prefer to shoot the tactical style matches engaging targets at 1200 yds. The big advantage of these cartridges is the abillity to load heavy bullets in a mag.

All can be used from a compact and reliable platform that the AR15 is so well known for. Just some food for thought. Not saying the AR10 is not a good choice, but boy, the 15 has coe a looong way baby.

JS

 

[thefitter]

If target shooting is the purpose for a gas gun, the 6mm or .22 cal is a super way to go. Although the 7mm offers the best bc bullets and would be a great choice in the .284 Win and larger, the smaller calibers really do offer significant advantage in the way of inherent accuracy and little recoil.

I shoot across the course and some F class, but prefer to use a gas gun almost exclusively. I have used the 6mm Hagar and my own .240 Tomahawk with excellent results, but I have permanently moved to the .220 Thunderbolt, which is the .22 cal version of the 6mm Hagar. I allows you to shoot the .22 cal heavies (77, 80, 85, 90) at 3000 fps+, with mid blowing accuracy out to 1000 yds. I have also built several .240 Tomahawks ffor guys who prefer to shoot the tactical style matches engaging targets at 1200 yds. The big advantage of these cartridges is the abillity to load heavy bullets in a mag.

All can be used from a compact and reliable platform that the AR15 is so well known for. Just some food for thought. Not saying the AR10 is not a good choice, but boy, the 15 has coe a looong way baby.

JS

Thanks for the info. I'll keep it in mind for next time, I already have the POF lower for a AR10.

I've been studying the case shape and capacity, as well as the various bullet possibilities and I'm starting to lean back to the 7mm-08 again. I'm going to expand some 6.5mmCM brass and see how the bullets fit in the case and magazine and then make a decision.

 

[jscandale]

In that case, don't rule out the .260 Rem. It's an excellent cartridge for the AR10. I have built several in .260 and .308 for the M110 configuration in the last year or so.

JS

 

[thefitter]

In that case, don't rule out the .260 Rem. It's an excellent cartridge for the AR10. I have built several in .260 and .308 for the M110 configuration in the last year or so.

JS

Got a JP Enterprises in 6.5mm CM. That's why I'm thinking of going up to 7mm.

Thanks

 

[jscandale]

Sounds good. Whatever you decide on, I hope it works out for you.

JS