Reeder Custom Guns - SRH 10mm Magnum - My first go with this cartridge...

Most know my slight obsession with anything 10mm/40 Caliber. Of course, the old 38/40 will always lead the pack.

But, I've been wanting to try a 10mm Magnum for some time. So, I picked up a Ruger SRH in 10mm Auto and sent it to Gary. Along with a simple rechamber, the barrel was squared up on the back and the barrel gap was set to a minimum.

The turning point for this project was the TK Moon Clips. They are simply the best I've ever seen. They are machined to provide correct headspace on these guns. At .050" thick, they hold the cartridges nearly against the recoil shield. The factory clips run .030-.032" and the cartridge headspaces on the case mouth. With the TK Clips, headspace is on the clip just as a Rimmed Cartridge.

Misfires were common in my GP-100 10mm when using 40 S&W ammo. The TK Clips eliminated that problem. They also allow a firm crimp in a cannelure if wanted.

Look forward to seeing how this gun performs. My guess is a rimless 401 PowerMag with the ability to shoot 10mm Auto and 40 S&W.

I'll report here...

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up in a Ruger.

Sean

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- No text -

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while and worked up MANY loads.
email me if you want it.
spharper at sbcglobal dot net

Sean

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Have been. As is either the .41 is too close to the .44 (.43 Magnum) or the .44 is too close to the .41. The .400 is better centered between the .357 and .44 in my view. Take your pick of jacketed .41 bullets, lube lightly, and in a real reloading press (not a rotary cartridge maker) mash them through to make a fantastic .401” jacketed custom bullet. It only gets a little longer.

It’s not magic, just smooth shooting. Working up loads is also easy the same as anything, just in between. For the same bullet weights you can’t push them quite as fast at the same pressures but close enough. The bullets increase in ballistic coefficients as they grow longer in slightly smaller calibers at the same weight too. In theory an advantage in retention and penetration. Hard to convince an animal though.

Remember working up hot loads in a DA, they all eject at the same time! So case drag is x6, not just one, as in the SA. You cant fly as close to the sun, hold a little reserve.

Lastly, CCI makes (very expensive) .40 S&W shotshells. NEVER, Ever shoot them in a clip run DA. Just don’t. - brass rod and hammer time!

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.401" and .400" just for sizing down jacketed bullets. If you sized down jacketed bullets too much at once the jacket springs back and separates from the core.

SRH 10mm Magnum - My first go with this cartridge...

you want some 10MM Mag load data I worked

Sean, If you like to post it, I have and interest.

It is a LOT of loads. I had Andy Rowes 10MM Mag for a

It’s just the rimless old Herters .401. What the .41 should

I had Lee build me custom sizer dies in .405"...

Sean, would love to have it...

Sent

Got it, Thanks...