.338 rocky mountain bullets?

[338 bruce]

wil a 1-10 twist be ok with thes bullets in 375?

[gfc91658]

Hello Travis,
Unfortunately I don’t think the 10 twist will stabilize the 325-gr bullets. To get a stability factor of 1.5 you should at least have a twist of 9 and 8 would even be better. Having a stability factor of about 1.8 really help the bullets when they go subsonic and extended ranges.

[gfc91658]

Hello Bruce,
The 10 twist will be great on the .375 bullets. They call for a 11.4 twist to get a stability factor of 1.5 so the 10 twist should stabilize good through the subsonic transition at extended ranges.

[kellyzier]

Originally Posted by dave42

Thanks George,

Couldn't be better timing for a new .375 high B.C. bullet.

My new .375AM has just arrived here in Canada and I will have my hands on it soon (Stuck at work for another week until I can go get it). I will post some pics of one of Kirby's latest creations ASAP, maby a range report as well.

I was worried about choosing this caliber due to the lack of bullets. It appears now that this might be the caliber to beat with improved ballistics over the .408 and better barrel life than the .338 Cheytac wildcats.

It seems like I made the right choice after all, now to get my hands on some of these bullets.

Dave

Dave, have you shot these bullets yet? I wonder what they group like past 1500 yards>>>

[kellyzier]

Originally Posted by gfc91658

Hello Bruce,
The 10 twist will be great on the .375 bullets. They call for a 11.4 twist to get a stability factor of 1.5 so the 10 twist should stabilize good through the subsonic transition at extended ranges.

Hey there...are we talking about the 375 cal 370 gr rbtat bullet here? If not, what is the best twist for this 370 gr bullet??

kz

[Black Diamond 408]

Kelly,
I will be testing the new design this weekend, Geo sent me some new heavier jacketed style.
They weigh right at 359.5gns
I will post the results when finished. I hope to stretch them out to 1200yds. I am going to try a slower powder burn so i can get the case full, 100% fill i am hoping for.

Dave

[kellyzier]

Originally Posted by Black Diamond 408

Kelly,
I will be testing the new design this weekend, Geo sent me some new heavier jacketed style.
They weigh right at 359.5gns
I will post the results when finished. I hope to stretch them out to 1200yds. I am going to try a slower powder burn so i can get the case full, 100% fill i am hoping for.

Dave

Dave, your header said 338 bullets...are you testing the 338 or the 375 cal this weekend??? I thought the 359 gr was the 375???