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Had visions of pill being seated using the bolt mashed home when you used the word "forced". Pill would have been driven into the lands a very long way had that been the case. Much clearer now.

I'd recommend not "forcing" the projectile back into the case. I'd recommend using a dremel to slot the sized neck twice, opposed, lube the projectile and as slowly and gently as possible, squeeze...

9 thou...... so you want to have a field load that will still be jammed hard into the lands?