How aboutforcing yourself to use 150grain corelokts just one more time and wait to use the 165grainers when you have had a chance to sight in with them.Just an option to consider as I have seen some guns shoot horribly with differentammo and I prefer knowing where the gun will shoot through actual experience. Dislikethe whole minute of deer/ good enough for metheory and would muchprefer tohunt with proven ammo/peace of mindespecially since it will only set you back about 13 bucks ofr a box on sale.Take care and good luck.