I haven't been able to get my 458x2 to feed reliably.
What I have tried so far:
1. Different brands of mags. Steel mags with a flat spring works better than PMAG, but still unreliable.
2. Rounding surfaces of magazine
I would prefer not to cut the follower back and add a filler. Current COAL is 2.375" but I would like the ability to load longer bullets in the future.
The problem is that the boolit nose-dives into magazine. What's your secret???