I built a LR .243 Win on a Stevens CF action. If I load either the 105 A-Max or 107 MK to magazine length they don't feed from the magazine. The problem is as the bullet starts up out of the mag it is so long that the rear of the cartridge slips under the bolt face and the bolt then rides over the cartridge. If I seat the bullets down from 2.8" to 2.6" or less I don't have the feeding issues. I had this barrel throated for long bullets up to 115 grains. What can I do to get the rifle to feed reliably?

Thanks!