Finally picked up a 10mm Magnum (Pic)

TonyRumore · March 31 2019 05:42:06 PM MDT

This one is pretty beat up, but at least it's all in one piece.

Pablo · March 31 2019 07:46:50 PM MDT

DOG!!!

Wow....... ${$default_shocked_smiley}$ ${$default_cool_smiley}$ That is impressive. Very nice, IMHO

Keiichi · March 31 2019 11:40:24 PM MDT

Wait... Is 10mm Magnum a thing?!

Don't get me wrong... it's a beautiful thing, but... is there a SAAMI spec for that?

Pablo · April 01 2019 04:42:01 AM MDT

Quote from: Keiichi on March 31 2019 11:40:24 PM MDT
Wait... Is 10mm Magnum a thing?!

Don't get me wrong... it's a beautiful thing, but... is there a SAAMI spec for that?

It's a wildcat.

cwlongshot · April 01 2019 07:33:33 AM MDT

AWESOME!!

Have ya shot it yet?

I have thought about reaming a Contender barrel to the longer case.

CW

http://www.sixguns.com/tests/tt10mag.htm

https://loaddata.com/Cartridge/10mm-Magnum-Accurate-Data-Loading-Guide-2/4049

TonyRumore · April 01 2019 12:14:30 PM MDT

I haven't fired it yet. There is plenty of load data in the Accurate Arms 1st Edition Manual.

Tony

Overkill338 · April 08 2019 10:57:01 AM MDT

Is it just the picture, or is the front bent downward? Like is it shaped like a rainbow?

Pablo · April 08 2019 05:16:08 PM MDT

Quote from: Overkill338 on April 08 2019 10:57:01 AM MDT
Is it just the picture, or is the front bent downward? Like is it shaped like a rainbow?

Lens fisheye effect.

Blades · April 08 2019 06:03:13 PM MDT

Quote from: Overkill338 on April 08 2019 10:57:01 AM MDT
Is it just the picture, or is the front bent downward? Like is it shaped like a rainbow?

That is to make sure the bullet drops and hits the ground once fired, if the barrel was straight the bullet would circle the earth and hit you. ${$default_grin_smiley}$

TonyRumore · April 15 2019 09:23:21 PM MDT

I fired the 10mm Magnum today with some commercial ammo from American Custom Ammo.
180gr Hornady with about 20.7gr of 296 flew 1550fps.

Tony

Ramjet · April 16 2019 08:39:51 PM MDT

I like it. Keep us in the loop on this project it's interesting. I would think you could get more out of it than that commercial,load?

TonyRumore · April 16 2019 11:28:15 PM MDT

I'm sure I could get more out of it with a hotter load or more suitable powder, but the Accurate Arms data using the exact same gun, shows the 180gr bullet going 1503fps at 42,000psi. I'm at 1550 with the ammo I have now, and I'm not sure I want to run the pressure past 42k in a gun with no available replacement parts. If you've ever owned an AMT gun, you know they're already kinda sketchy in the quality department.

I was having problems with the gun only partially extracting the case and then dropping it, with a failure to eject.

I reworked the extractor to allow it to travel inward a bit more, installed a heavier spring and polished the chamber. It works perfectly now.

I shot it again today, and put it on paper. The good news is that it stacked them into about an inch group at 50 feet hand held. That's about the best I can do with my eyesight these days.

It was hitting about 3.5 inches high and the sight wouldn't go down any more. So I get to looking at it, and there is plenty of clearance under the sight, but the elevation screw stops dead. I pull it apart, and find that the springs under the sight are not correct and are collapsing to solid way before the sight is all the way down. I replace the springs with more suitable units and I get full travel back. With the sight now bottomed out, I load it back up to give it a try.....and what happens?....the dreaded AMT "Click". Light primer strike, of course due to a bent hammer strut and sacked out, bent to crap hammer spring. So I replace the spring and the strut, which end up bent on the first hammer cock anyway, but at least it had enough umph to fire and it hit dead-on.

The entire hammer, spring, strut, and spring bore need a complete redesign on all the Automag 2/3/4/5/ pistols. All of the guns have the same problem. The design is a complete failure.

Tony Rumore
Tromix