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Hard to fathom. No internal deburring with produce variably scratched projectiles which can't help. No neck trimming will eventually lead to projectile crimping that will up pressures. Who would want...

Chainsaw's advice is good but I'll add that you can often eventually end up in a situation where the 2-3 thou that normally works suddenly won't. That's because of base expansion, ie, the ~ 15mm...