I don’t know anything about first shot velocity difference because I’ve never recorded it .
But I would like to comment in regards to any first shot POI shift .
I was listening to podcast a while ago where the very experienced shooter mentioned that he believes that any cold bore POI shift is more to do with a “ Cold shooter “ rather than a “ Cold bore “ .
He suggested that the shooter should “ dry fire “ a few times before sending that first round down range.
I’ve done this ever since , and it’s surprising how many times I’ve adjusted my natural point of aim / position before shooting that first shot .
I can honestly say that since doing this I’ve noticed very little to no POI shift from my first shot to the subsequent following shots of the group .
When I have a shot fall outside of the group no matter which shot it was in the group, the first thing I question is myself and not the load .
Sure there are times when that flyer is unexplained, but the majority of the time it had something to do with my shooting form / setup.
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