Brass to 300blk.. Chamfer tool for after cut (I have a Giraud tri-way but...)

T

taymag

New member
Whats a decent chamfer and deburring tool to use for a quick pass after the shoulder cut? My tri-way is perfect for trimming/chamfer/deburring but I need something to chamfer and deburring before sizing.

All I have is that dome Lee handheld chamfer and deburring tool... Anything better for a couple hundred cases or should I just stick with that?
 
I'm always opposed to "chamfering" since that usually implies cutting a bevel into the inside of the case neck to facilitate bullet seating, resulting in thinning of the neck at the mouth, sometimes even carried to the point of forming a knife edge at the mouth. My recommendation is to simply debur the case mouth, inside and out. Flaring the case mouth is very seldom needed for seating jacketed bullets but certainly can be beneficial. If flaring is desired, consider the Lyman tool called the M die, also referred to as a neck expander die, that flares the case mouth.
 
With that 300 Blackout, he's got to start with a 223 case and cut if off just below the shoulder, leaving a nearly straight wall case before forming a 308 neck into it. I think he's just trying to get the burrs off that cutoff brass to make forming the neck smoother and avoid getting burrs caught up in it and causing scratches.
 
Roger on the follow-up. The title apparently was intended to read ".223 brass to .300blk". The reference to "shoulder cut" does suggest a conversion. Factory .300 Blackout brass seems to be plentiful and inexpensive though. I would think that an M die for the .300 blk, due to its shortness, would have to be a shorter version that an M for .308s, '06s, .300 mags and others that are interchangeable due to adjustment capability. Would a converted .223 case result in a thicker case neck that might benefit from being flared during bullet seating? Perhaps so.
 
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