12-11-2013, 04:05 AM
Most of my mags will hold a 2.300" cartridge. The cheaper magazines seem to hold longer rounds. AR stoner mags will hold 2.29 without a problem and 2.30 in some cases. With the bullet you reference I'd say you have a much longer than average throat or a very funky headspace. I lengthened my throat by .060 and that particular bullet hits the land at 2.280. Still, longer is better as far as I'm concerned, providing the lands are not unreachable. Your gun should shoot a little faster at a little lower pressure with a little less powder compression than a gun with a shorter throat.