Yup @Chopr that's the only issue I've run into in the 300 AAC with some projectiles e.g 125 Noslers they seem to catch the edge of the throat (at the neck) and dig into the feed ramp. Must be a speed and angle of the projectile thing.
Two options (actually 3)
1. Feed fast and forcefully ... seems to work but noisy- but hey it has a great half cock or you can Hammer down the loading of teh first round so all you need to do is lift the bolt up and down to re-cock.
2. Chamfer the throat end of the case really well in the reloading prep stage so there's little or no bur to catch on on the ramp - has worked well with me for subsequent loads but I really did have a few WTF moments there for a while at the range loading.
3. If possible if your gunshop or person buying from will let you (hopefully you've pre-built some 4or5 drill rounds - no powder or primers) to test the actual magazine. I understand from overseas forums there have been particularly earlier shipments some faulty magazines that won't even pick up a round - Check out you-tube they're out there about 8-9 months ago. Test and swap till you get a magazine you're happy with. Ruger in the US were replacing no questions asked but as the american is magazine only feeding it can be a major piss off that it doesn't work when you need it to.
Hope that helps some of you out there...
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