There must be guys who do this instead of just shooting premium stuff all year ?
For training I shoot cheap stuff.
Difference in POI in my rifles for premium and FMJ are workable for training.
My main center fire training calibers are 308 win and 30-06. For training I shoot FMJ.
In my 30-06 difference is maybe 2 inches in POI, which I compensate by changing POA
308 win is varmint rifle, at 100 meters, almost identical POI. Also working with mil surp ammo, satisfactorily.
Next calibers I train with:
22lr, whatever cheap ammo I can find
375 H&H, on each training session few shots.
For 375 H&H chepeast ammo is PPU, soft point.
Before the hunting season, or before safari, only then I take hunting ammunition out of safe and check, and double check zero.
I dont care much about MOA accuracy on training ammo, as long as accuracy is meaningful for training. I try to keep hits within vital zone, in field positions and from stick
But I take care that I have sufficient ammo on stock for training, and for hunting.
Minimum hunting ammunition quantity for me is 120 rounds per caliber. When numbers drop below, I buy another 120 rounds, per caliber. (Check zero, re-zero, etc...)
Usual stock of training ammo, full safe 100% (I dont count)