416RH, Thanks just the same, but i messed up big time, I safely ran those 600 gr Woodleighs upwards of 2465 fps with the H-4831 powder, no over pressure problems at all in my rifle.
My loads now run 2150 fps, I gotta believe that's plenty for any game animal worldwide, my 505 is relegated to the excellent iron sights that came on the gun, I'll only use it for very big animals up close, it has killed two scoped in the past.
Your chrono is most likely giving you fits from the massive gas wave from burning 145+ grains of powder, I chronoed my 505 from 25' back, works just fine, make sure your not shooting next to a structure, or under a low roof, the gas has nowhere to go but straight into the machine if confined, also check that you have a good hot battery too.
Gunner
