Bat M Bolt nose cone depth.. same on all bolts?

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I recently purchased a mag bolt for M action for a .284 to 300 wsm switch barrel.

Mag bolt will not close with my 284 barrel. The mag bolt cone was contacting the barrel. While the standard bolt cone has .007 clearance between bolt and barrel.

So in my experience, the mag barrel does need a deeper relief (shorter dimension between shoulder and 25° cut).

This is correct. Mine are the same way. Cones are different between 308 and mag bolts.