Re: A-max vs V-max
3 or 7 grains less bullet weight is pretty radical.
Boat Tail vs Flat Base. All sorts of influences.
More radical is the increased case capacity from the shorter bullet. Results in lower pressures and lower velocity.
If it were me (IIWM), I would start fresh and work up a load for the 52's.
Fred Seaman - NRA Life Member
“Ask, Listen, Learn, Grow”
"Quit worrying about the little things, good luck and god speed"