Out of curiosity, I just ran some ball numbers through the Greenhill formula calulator that was posted in another thread.
I punched in 440 RB, 445 RB, 530 RB, 535 RB, 570 RB, 575 RB, 45 Maxi, 54 Maxi and my Lyman 54 Shocker and associated appropriate numbers into the blanks using the setting "Under 2800 fps".
Here's what I got-
440 and 445 RB needs a 1:66 twist (no difference because of diameter.)
530 RB needs a 1:79 twist (strange number- I expected 72)
535 RB needs a 1:80 twist (one turn difference because of diameter- weird compared to the above example.)
570 RB needs a 1:85 twist (thought this would be faster, too.)
575 RB needs a 1:86 twist (another off by one because of diameter.)
45 Maxi needs a 1:41 twist (faster than I thought it would be.)
54 Maxi needs a 1:49 twist (Might as well be on the money.)
54 Shocker needs a 1:45 twist (445 gr.)
I was surprised at the great difference in what the formula says they require, and what the Thompson Center factory supplied in the barrels (1:48 in the Hawken and Renegade).
I see why my 54 Renegade shoots the Maxi's so well, too.
I haven't tried the Lyman Shocker boolit yet for comparison.
Comments or thoughts?
What is the twist in your rifles, and how do the above projectiles shoot in what you have, or have you tried any of these?