Hello shotguntom,
I have a .243, and I home load my rounds for it, I use a sierra .243 round (of course) # 1560, this is a 100 grain soft point boat tail round (SBT) loaded with 36 grains of 4064 IMR powder, CAOL (cartridge actual overall length) is 2.710 maximum. this produces a muzzle velocity of about 2,850, a good all rounder in my view. This round is big enough to use on most deer species in UK, and is of course legal in Scotland, should you wish to stalk there, enjoy it. I do however recall contacting Sierra bulletsmiths in the States requesting their reccomendations for bullet size/type for shooting Red Deer in Scotland, and they suggested an 85 g bullet (SPT), they clearily did not know the minimum bullet weight for the use of deer stalking in Scotland, which is of course a 100grain bullet