Thread: Barnard Action Hunting Rifle

Why the 6mm Creedmoore over the 243?
You are building a custom rifle so you will probably be picking the same barrel, 7:1 or 8:1 twist. You are building on the same Barnard action with the same HS or AI magazine so you are limited to the same OAL of 2.86".
Is there better brass life with the different case shape?

I get it that the 6mm CM vs a factory 243 wins at long range with the heavy bullets due to being able to seat the long bullets further out and the faster twist factory barrels.

From Wiki so take with a grand of salt
243 case capacity is 52 - 54.8 gr of H2O
6mm CM capacity is 50 gr of H2O
This is a bit vague as the 6.5 CM is listed at 52.5 gr H2O.
Now the CM family does a have slightly higher case pressure but that's not relevant given both being used in the same action.
Z

Originally Posted by ZQLewis

Why the 6mm Creedmoore over the 243?
You are building a custom rifle so you will probably be picking the same barrel, 7:1 or 8:1 twist. You are building on the same Barnard action with the same HS or AI magazine so you are limited to the same OAL of 2.86".
Is there better brass life with the different case shape?

I get it that the 6mm CM vs a factory 243 wins at long range with the heavy bullets due to being able to seat the long bullets further out and the faster twist factory barrels.

From Wiki so take with a grand of salt
243 case capacity is 52 - 54.8 gr of H2O
6mm CM capacity is 50 gr of H2O
This is a bit vague as the 6.5 CM is listed at 52.5 gr H2O.
Now the CM family does a have slightly higher case pressure but that's not relevant given both being used in the same action.
Z

Yup why I went with Criterion 243 7.5”. Good Lapua brass, Foster seater etc. Now time to play, just loaded some S107gr HPBT.