10mm revolver crimp

[Cowguy]

How much do need to crimp these so they don’t move?

[jonniej]

I don't have a measurement, ( I'll check later ) I guess there aren't a whole lot of us 10 mm wheel gunners out there. I found a "Lee factory crimp" die seems to do the trick. At least for my S&W 610. Good luck JJ

[Joe4d]

might have to search for a roll crimp die,, I am guessing most 10mm's are taper crimp as its an auto round.
I have pretty much just followed the turn down directions on the dies when loading 44 mag and 357 mag,, but I always used bullets with a crimp groove and roll crimps.

 

[Dr. Phil]

You might get some info by measuring a factory round and see what they crimp to.

Different cases might be slightly different thickness nut it will give a place to start.

You can also put a loaded factory round in your (backed off) die and adjust to those specs for crimp and COL.

[Ronemus]

The 10 mm Auto headspaces on the case mouth (it's rimless) so it should be taper crimped, not roll crimped; you might get FTFs with roll crimped ammo.

[Joe4d]

11 hours ago, Ronemus said:

The 10 mm Auto headspaces on the case mouth (it's rimless) so it should be taper crimped, not roll crimped; you might get FTFs with roll crimped ammo.

did you read the thread title ? 
We are talking revolver, and problems pretty isolated to revolvers.. IE bullet creep.
These rounds will head space on the groove/clip... and no its not gonna failure to feed.. 

[Farmer]

3 hours ago, Joe4d said:

did you read the thread title ? 
We are talking revolver, and problems pretty isolated to revolvers.. IE bullet creep.
These rounds will head space on the groove/clip... and no its not gonna failure to feed.. 

He didn’t say what kind of revolver, if it’s a SA they will headspace on the mouth. I would try - .002” smaller at the mouth edge than .100 down the body for starters. So if the case measures .422 @ the center of the bullet in the case, the mouth should be .420-.419. Might have to adjust those numbers to your brass and bullet size. 

Edited December 11, 2023 by Farmer
Added

[Cowguy]

It will be in a 610. My fear was the bullet moving into the case and causing too much pressure. After a detailed conversation with revoman he assured me that the bullets would walk out,not in. That could cause the gun to not work, but not blow up. The Lee fcd seems to be working.

Edited December 12, 2023 by Cowguy

[Tom Freeman]

The easiest fix for me was to increase the neck tension on the bullet by polishing down the expander die 2-3 thou.

 

Bullet pull/creep reduced to nothing and my ES/SD went down a little bit as well.