Velocity with a monolithic is beneficial. Sectional density for close range is my concern. If it is above a .20 u should be good 2 go.
S.D., 80 gr. .257 TTSX is
.173.
Check this observation about the 80 gr. TTSX at 3,900+ fps out of a .257 Wby being less than effective for a cull hunt.
www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/12175458Waiting on Model70guy to respond to the question of why he considers this load to be a "POS".
I think I know the answer, but will see what he says.
DF
Edited to add, the 80 gr. 6mm TTSX/3600+ fps load that I had issues with, that bullet has an
S.D. of .194. So, maybe the
.20+ S.D. value may have terminal performance importance with small TTSX/TSX bullets pushed at very high speeds. More info needed.