So, I wanted to do some drop verification with my rifle today, since the weather finally wasn't freezing. I had just cleaned it, so prior to my test, I put 10 rounds through it to get it fouled. I shot those pretty fast, like 30 seconds between shots. i went and retrieved that target and placed a new one, 300 yards out through the snow. I got myself situated and fired the 5 shots I was using for my drop test. why 5? It's what I had and didn't want 2 random rounds left after my test.
I waited 2 minutes between each shot in the test. The mirage coming off the melting snow in the 65 degree weather sucked.
Here are the conditions:
Wind variable 1-5 from 5 o'clock
Berger 155 VLD target
45.1 grains IMR4895
Lapua .308 win standard Brass
Here is the target. I counted the 2 "groups" individually when I did the target analysis, but total vertical spread of 1.052 MOA.
my first thought was stringing from the barrel being heating up, but since it does appear to be 2 discreet groups, I am not so sure. I'll freely admit that shooter error might be the problem, just looking for other explanations before the verbal self abuse begins. Any thoughts or comments would be appreciated.