Odd BBLs From Numrich

[sheepherder]

Originally Posted by Olle

Rich,

What kind of tool do you use for the crown? I have tried to grind HSS bits for crowning and other chamfering operations, but have never really been able to come up with anything that makes a clean, chatter free cut.

Brownell's sells a curved lathe tool bit that isn't too bad for a curved tube end. I have 30º/45º/60º 'chamfering cutters' [countersinks] that I use to break the sharp bore edge and blend in the lands & grooves. (I also have tried them for cutting feed ramps; they work pretty well for that too). I'm pretty slack on 'rounding off' the end of thin barrels. The flat squared-off end looks pretty nice to me.

Edit: I just realized which barrel this is. Since it has a threaded-on front sight base, it's not rounded at all. I left it 'squared' and just broke the sharp bore edges with a 45º chamfering tool.