Here are some #'s from allaboutshooting on old gobbler. I'd like to see what a 20" barrel would do over the 28" but in this case the numbers look good.
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Want To Buy;
Form die for a 7mm Mashburn Super.
.284 Hornady AMax 162gr.
.224 Hornady AMax 75gr.
22-250 bushing die
Bushing die that will work with the 7mm Mashburn Super
A couple Glock 42 380ACP mags