Bullet "slam" in magazine - tips deforming
I'm looking for a little help or advice from bolt action big-bore shooters on how to prevent a problem with rounds in the magazine. Here's the issue:
I just started the barrel break-in on a Ruger 77RSM in .416 Rigby. I loaded up rounds with 400gn Barnes TSX pushed by 100gn of RL22. This is 3gn under max load and averages 2332 fps through the chronograph.
I thought that I should check for bullet movement (crimp tightness), so each time I fired the rifle, I put 2 rounds in the magazine. There is about 1/8" clearance in front of the bullet tip.
I'm finding that the tips of the TSX bullets in the magazine are getting badly deformed after only 2 shots. The tips are hitting the front side of the magazine.
Are there any tricks for preventing this?
I thought about a thin plastic insert glued to the front of the magazine to cushion the bullet tips and might test this over the weekend.
Thanks for your help.