41 Mag mold "undersize"?

[deerstalker]

Well I won a bid on e-bay, for RCBS 41 mag. mold, the question I got is it suppose to be .411 or .410? My neighbor has the same mold, and his drops a .411, mine is a .410. This is even after I run it thur a Lee sizing die. I may have to wait and see how it shoots out of my S&W. Thanks Rick..

[BruceB]

G'day, Rick.

My one-and-only .41 mould is the RCBS 41-210, which drops boolits at barely .411" and 217 grains in straight WW alloy.

My Lyman sizing die is nominally .410 and actually sizes less than one-thousandth larger than that (i.e.: not quite .411"). My S&W Model 57, 8.375" barrel, shoots VERY cleanly with this un-hardened bullet and 17.5 grains of 2400. No visible leading at all, at all, and the accuracy is simply spectacular. This is likely the most-accurate conventional handgun/ammo combination I have ever owned, and that covers a LOT of ground.

Try what you've got...it may surprise the dickens out of you. A thousandth +/- probably won't mean boo in the long run. ENJOY!

[44man]

Deer stalker, it is just fine! Have fun with it.

[Buckshot]

Well I won a bid on e-bay, for RCBS 41 mag. mold, the question I got is it suppose to be .411 or .410? My neighbor has the same mold, and his drops a .411, mine is a .410. This is even after I run it thur a Lee sizing die. I may have to wait and see how it shoots out of my S&W. Thanks Rick..

What do your chamber mouths, and grooves mike?

...........Buckshot