Just some more considerations to ad to gotcha... If you were f/f off the shelf ammo would be good. But, you already have Lapua brass and 75 gr. bullets.

So, now you need 22.250 dies to size and load the new Lapua brass in order to f/f it. You could probably use a mild load, about 35 gr. of your IMR 4350 with the 75 gr. bullets to fire form... Check manuals to verify powder loads...

After you f/f, you will need a set of 22.250 AI dies for the formed brass... Then, you could work up loads with IMR 4350, or consider RL19 or RL22, or other powders.

Good luck... The 22.250 AI is keeper.