...depends on the rifle. On an action that has some "spring" to it, I would say full length size. On an action that doesn't have that spring to it, then neck sizing MIGHT give you better results. It's no guarantee, though... One thing to consider for hunting ammo, is the "Murphy" factor... anything that can go wrong, will... and at the worst possible time. If there is a blade of grass, a thread, whatever.. that gets in with a neck-sized only cartridge, then you have the potential for failure to chamber...or extract. If you want 100% reliability, then I say full length size.

"Progress, far from consisting in change, depends on retentiveness..those who cannot remember the past are condemned to repeat it." Santayana