i use win brass, 46.5 of varget, cci200, 2.860 OAL which gives me a .050 jump in my 1 in 10 twist 26" mcgowen. they chrony @ 2947 fps, and i gained nothing accuracy wise by seatin them out longer. i do use the Lee Factory Crimp die on mine, hey, it lowered my ES, and tighten the groups slightly. these shoot 1/2 moa all day any day all the way out shootin prone off a bipod.
my 300wsm shoots them a wee bit better, almost too little to measure. i seat them a bit closer to the lands and push them hard.
let us know how they work for u!
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