Home Forums Lever Action Central Marlin Talk +P loads for 45-70

Here is the comparison of 350 grain .458 bullets shot in a 24 inch test barrel and then the 18.5 inch Guide gun.



2216 fps to 2052 fps-164 fps difference.VVN-133 W/350 Hornady-41,400 PSI

2170 fps to 2041 fps-129 fps difference.AA2015 W/350 Hornady-40,200 PSI

2235 fps to 2063 fps-172 fps differenceAA2520 W/350 Speer-42,000 PSI

2153 fps to 2025 fps-128 fps difference.H-4198 W/350 Speer-40,100 PSI



Or an average of 148 fps difference from the 24 inch barrel to the 18.5 inch barrel and all within the pressures of the .450 or 45-70.