Originally Posted by dustybrown
Have you ruled out other factors ? I have seen a gun build preasure and with that mv increase as well. A fouled barrel can some times cause this... bullet seating closer to the lands can do the same.... increase MV.. some brass can have different capacities ie... rem vs. nosler vs. winny brass.
You didnt say how much the MV had increased ? I assume quite a bit dropping two grains...to get the same. Also dont take the chrono as gospel... did you see a POI change at longer ranges ?
?.....nope, cleaned well before shooting.
Bullet seating length
?......nope, same as before, measured with Hornady LnL OAL gauge.
?.......nope, all the same lot of WW brass, all fired the same number of times.
?.........Don't know, I started at 2 grains below where I was before with 72 grains, and once I saw the same velocity with 70 grains, I didn't go any higher, also shot it at 600 yards with 2 grains less powder and drops were right on.