The IMR reloading data for a 140 gn in 7x57 with IMR 4831, gives
BULLET WEIGHT140 GR. NOS BT
But when I look at the Hornady reloading manual, same cartridge, bullet weight and powder 47.4gn of powder is the max load, and starting is 40.4gn.
Which should i believe and yes will work up a load but where should I start?