6 PRC reloading

[406Backwoods]

26" though?

Dont shoot ELDs with it? DTACs might hold up to the revs fine?

I’ve considered trying the DTAC. I just don’t want to have to run a mono in it. I know the rpm’s will be high but a 7.5 twist with a 3,400 fps velocity is only at 1.59 SG. The 7 twist puts it at 1.82

 

[mlevimadden]

I’ve considered trying the DTAC. I just don’t want to have to run a mono in it. I know the rpm’s will be high but a 7.5 twist with a 3,400 fps velocity is only at 1.59 SG. The 7 twist puts it at 1.82

What is your concern with having a 1.59 gyro in the 7.5 twist? Both Hornady and Berger specify you’re getting fully optimized BC at 1.5 and going with a faster twist is just getting you a lower muzzle velocity at the same pressure, increasing dispersion, and increasing your chances of issues with bullet jacket separation.

 

[2buffalo]

26" though?

Dont shoot ELDs with it? DTACs might hold up to the revs fine?

20"

 

[406Backwoods]

What is your concern with having a 1.59 gyro in the 7.5 twist? Both Hornady and Berger specify you’re getting fully optimized BC at 1.5 and going with a faster twist is just getting you a lower muzzle velocity at the same pressure, increasing dispersion, and increasing your chances of issues with bullet jacket separation.

I already have a 7 twist barrel that I’m wanting to get rechambered. Also, 1.5 is the minimum for optimized bc. 1.49 is still considered “marginal”. More is gooder, right?

 

[wind gypsy]

I already have a 7 twist barrel that I’m wanting to get rechambered. Also, 1.5 is the minimum for optimized bc. 1.49 is still considered “marginal”. More is gooder, right?

I wouldn't choose a bullet just because it has higher than 1.59 SG if the bullet with the 1.59 SG had other more desirable attributes for your goals.

If a DTAC shot well out of a 26" 7 Twist 6 PRC, id be hard pressed to want to try ELDm's. Maybe 103 ELDx would be a safer choice than eldm for that application?

 

[406Backwoods]

I wouldn't choose a bullet just because it has higher than 1.59 SG if the bullet with the 1.59 SG had other more desirable attributes for your goals.

If a DTAC shot well out of a 26" 7 Twist 6 PRC, id be hard pressed to want to try ELDm's. Maybe 103 ELDx would be a safer choice than eldm for that application?

I think I’m going to reach out to Hornady and probably David Tubb and see what the max rpm’s are for some of these bullets. I just thought it was interesting that a 115 Berger Target at 3,400 fps was under a 1.5 with an 8 twist but a 7 twist would put it at nearly 330k