10mm case lenghth


PDA






bpkmary1
November 13, 2008, 07:03 PM
Although I am not new to reloading, I have no experience in loading auto loads. I understand that the case lentgh is critical but would like to know how critical it is. One reason I ask is because the latest Lyman Manual indicates the case length of a 10mm Auto case shoud be 0.982". I checked the case lenth of some new Winchester 10mm cases and found them to be 0.986". Is it necessary to trim to 0.982"? How much leeway can be given?

If you enjoyed reading about "10mm case lenghth" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!
Ol` Joe
November 13, 2008, 11:27 PM
One reason I ask is because the latest Lyman Manual indicates the case length of a 10mm Auto case shoud be 0.982

max lgt is max lgt.
The Lyman #48 I have though shows the max to be 0.992 and "trim to" lenght as 0.982. your brass at 0.986" is fine.
Trim to recommended "trim to" lenght any time your brass excedes the SAAMI max.

jeepmor
November 14, 2008, 12:45 AM
10mm guns are fun aren't they?

I checked my RCBS trim chart and it matches Joe's info

I recommend American Eagle plinker brass for reloading. All the hot loaded Starline stuff I've used has splits. Never a split on this Federal product after several whompin load firings.

Hope this helps even though I drifted off a bit.

jeepmor

Shoney
November 14, 2008, 05:18 AM
Your brass is currently within standard tolerances. All straight wall pistol cases actually shrink a miniscule amount with each sizing.

You don't need to trim them, unless you are of the anal retentive personlality.

rcmodel
November 14, 2008, 12:44 PM
The 10mm headspaces on the case mouth.
Take the barrel out of the gun and chamber-check the cases in the actual chamber they will be fired in.

If they don't stick out past the barrel hood, you are good to go.

Straight-wall pistol cases are taper-crimped, and taper-crimps are not nearly as length sensitive as the roll-crimp used on revolver ammo.

bpkmary1
November 16, 2008, 10:09 PM
Thanks to all that replied. Yes!!! Shootin' a 10 is great fun.

If you enjoyed reading about "10mm case lenghth" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!