02-10-2020, 11:25 PM
glk45 Wrote:I'll agree with you on the AA2520. Missed a broad side coyote at 110 yards last week. Aimed center mass complete miss. Had the gun zeroed at 200. Put up a target at 200 shot 10" low. Back to the loading bench. Developed that load last august.
Gk45:
With 2520 some documents say the velocity changes one fps per one degree F of powder (not air) change.
One minute is about 50 feet per second. So one minute is a powder temp change of 50 degrees F.
And you shot five minutes low at 200 yards. Which equals about a 250 degree difference in powder temp.
Something tells me that your shooting five minutes low at 200 was not due to changes in powder temp.
LR55