Well my Rem 770 in 30-06 has a 1:10 twist 6 groove bore so basically at some point as I increase the velocity so will the number of revolution be imparted to the bullet and with any imperfection the cast bullet might exhibit seen or unseen that will accentuate any imbalance /stability of the bullet as it flies through the air mainly Wobble and Yaw thus making the bullet inaccurate and in some instances even causing it to fly apart as it exits the bore if the bullets alloy isnt strong enough to handle the gyroscopic forces. The only way to increase the velocity and still keep the bullet stable in a certain RPM range is to use a slower twist bore like a 1 to 12, 14 or 16 twist.RBHarter wrote:I'm curious about it not stablizing ?
It's creator designed it to be a high velocity greased and checked bullet .
Over spun maybe ? The work done did get it sub MOA at 3000 fps but it was done in 1-16" twist .
According to what I have read I really shouldn't have been able to do what I did with in my rifle with a 50/50 alloy, powder coat / quenched, gas check bullet. Accuracy should have gone south right around the 2K fps. range but I just blew that off, I mean what the worst that could have happened, bad accuracy and a leaded bore or the bullet never made it to the target.
Granted my groups were only at 50 yds. so I still have to prove I can stay at that velocity and get acceptable accuracy at 100 yds. or more but I think it's doable and I might have to harden up my alloy a bit as well, but thats the fun part of experimenting. On a side note I shot almost an identical group about quarter size with the same load using a Lee 170 gr. FN bullet. I'm still a full 3.0 grs. off the Max. charge weight I can use with this load an bullet weight so I have that to ponder as well. But if I can get this load to shoot MOA at 100 yds. I'll be happy with that.