Load Book Discrepancies
glb243 Member Posts: 49 ✭✭
edited January 2011 in Perry Shooter Competition Shooting and Reloading Forum
I reload alot for my 44 mag. For the past few years I have cast all my own bullets. My current favorite is the Lyman #429244 255 grain SWC. I'm using 21.5 grains of H-110. According to my Lyman Load book, the average velocity should be around 1097 fps. with 21.8 grains. Recently I aquired a chronograph and found that my average on six strings of six shots was 1364 fps on a 30 degree day. Has anyone else noticed differences like this? And if my velocity was off this much, how far off are my pressures?