450_Ackley, Actually, I suspect that all of the CZ550 magnums have long throats (I haven't checked mine though), and this may explain why I can't get my 375 to shoot the lighter projectiles accurately - they are just too far away from the rifling at the start and must misalign. The heavier (300 and 350gns) round nose shoot okay. 220gns will do 2-3 MOA @ 100 yards and the heavier ones around 1 1/4 MOA (best group 3/4 MOA @ 100 yards and 1 MOA @ 200 yards). I know 3 inches @ 100 yards is plenty of accuracy for larger game, it's just that the model 602 375H&H I had many years ago would do MOA with everything, so I had high expectations. Besides, there is no reason the larger calibres shouldn't be accurate.

And this would also explain the dramas I had with reduced loads in my CZ550 458WM (with cast projectiles). I got about 3 projectiles stuck at the start of the rifling (on different occasions of course), and those hard cast projectiles are very hard to knock out. Even a primer in an empty case will jam a lead projectile solid. With so much freebore, initial ignition was unreliable with a reduced charge (ie lots of empty space in the case).

Anyway, I've highjacked my own thread.

So either 500 NE in a single shot or 500 Jeffrey in a bolt action - I've got some consideration to do (and checking for actions out there).