[jayvoigt@yahoo.com]

I am having trouble setting my new Hornady 10mm/.40 S&W dies I cant seem to get a good crimp around the casing and the free floating seater sticks to the cartrage when AI lower the press. Any help woul be appreceated!!!! Thanks

[Randy1911]

I know that the Hornady dies for autos use a roll crimp with the floating crimper. I bought a seperate crimper and all of my problems went away. Call Hornady and talk to them. 1-800-338-3220

[rcmodel]

The only crimp you should get is a light taper crimp, just enough to take the case mouth bell out and make it straight again.
Touching the bullet, but not cutting into it.

Don't confuse straight-wall auto pistol calibers taper crimp with revolver roll-crimping.

The .40/10mm headspaces on the case mouth, and you most certainly don't want to crimp it smaller then .421" - .422" or so, as measured with dial calipers.

SAAMI spec is .423".

rc

[Shoney]

Look on the die box to see what it says. If it does not specifically say TAPER CRIMP, then it is a roll crimp die.

Why Hornady puts out all standard dies in roll crimp, even the cases known to need taper crimp, is beyond my comprehension and a poor move on their part.

They only offer 8 taper crimp dies that come singly, not in sets, and they do not have a seating stem. To see the 10MM Horndy taper crimp die
https://www.hornady.com/shop/?ps_session=b28c475560c8633f941f39e8ff1f3a15&page=shop%2Fbrowse&category_id=04bb9479595f2d38520307b7ee6dd5fb