Relationship Between Twist and MV
Is see that larger bullets need a faster twist rate to perform. Is this because, for a given caliber, the larger pills have a lower MV, thus need to be spun faster to obtain the desired spin rate? Using my 243 for example, it shoots 100 gr bullets better than 70 gr. Twist is 1 revolution in 10 inches. At 2900fps this corresponds to 3480rps (revs per second). Taking the 70 gr pill at 3400 fps you get 4080rps. Some bbl makers show you should use a twist of 11 or 12 if you want to shoot a 70 grain bullet. With a twist of 12 at 3400fps you get 3400rps.
So if I want to shoot the 70gr projectiles better out of my 243 is it simply a matter of reducing the load to match the MV of the 100 gr bullets or am I looking at this like a dorky engineer who needs to get out in the woods more often. [img]/ubbthreads/images/graemlins/wink.gif[/img]
"The fear of the Lord is the beginning of wisdom, all who follow his precepts have good understanding."