View Full Version : Specific velocity for a given rate of twist
November 15, 2009, 12:37 PM A particular bullet/sabot
manufacture has "recommendations" of bullet weights for my 1:28"
twist Knight MK-85. However, just as important, it would seem
there should also be a recommended velocity range that would be
compatible with a certain bullet weight and rate of twist. I was
going over the Greenhill formula and I couldn't figure out what
I wanted.  Is there such chart anywhere? And if so, would I use
the .40 cal bullet dimension or the entire .50 cal sabot?
Thanks.  Old Grump November 15, 2009, 07:47 PM bullet length not
velocity or weight is the determining factor, go with the
manufacturers suggestion, they do not want unhappy customers and
they have already done the research.  November 16, 2009, 03:05
AM  You are correct, the velocity is a primary determining
factor in projectile stabilization.  The simplified Greenhill
formula for lead/lead-core elongated projectiles will put you in
the ballpark for twist rat