What have people seen with respect to collapsing shoulders when necking down 6BR brass? Got a new Forster FL die and ran a few pieces of new Lapua through, bulged/collapsed all three shoulders and saw significant belling of the case neck mouth too.
Sent the die off to get honed to 0.247” (talked to them on the phone, they said they’ll hone more than their order form says, they just don’t recommend it). Hoping that’ll fix it (I’m necking down something like 30 thou with the raw die, the honing should make that more like 20 thou), but just wondering if I’m gonna need a step-down die. Really don’t want one, since I’m not running a bushing die.
@Birddog6424 you said you neck down in one step, what OD are you going to when you do, and using what die setup?