SIG Sauer- P220 Stainless Elite.

I've shot both 357 Sig and 45 ACP, in the Range Supply line. The 357 was pretty hot, Underwood doesn't sell a +P 357 Sig, but this stuff is nice in my P226. I also have shot a box of 45 through my P220 and Sig 1911. good to shoot. It wasn't as hot as their +P, almost though. It was $7 a box cheaper. I have put a bunch of 45 +P through my G21.  All of it was very accurate. I feel I got my money's worth.

Quote from: Bayan Dundee on October 27 2017 06:02:34 PM MDT
just wondering if anyone knows whether or not a 10 mm Glock barrel, OEM or aftermarket, can have the chamber shortened by shrink installing a sleeve into the barrel which can then be reamed down to the correct headspacing depth to accept the 40 s&w round? basically just bringing the shoulder up the 2mm or so needed to match the 40 chamber.
As to why, just know that I live in Australia and our laws are silly

I've shot lots of 40 S&W in my 10MM. It works fine. It obviously isn't as hot as 10MM, but it shot fine.
John

Quote from: gandog56 on October 03 2017 08:09:01 PM MDT
What is the speed of sound at sea level? Seems like I would have to run a 10mm down to .40 cal short and weak velocities to make it worth suppressing.

1180 fps. 

Quote from: samt on October 02 2017 03:42:31 PM MDT
have you had any malfunctions with the new guiderod spring and adaptor in the gen4? im seriously considering purchasing a 20 lb spring and adaptor for my gen 4 since i shoot alot if underwood ammo.

No, it is very reliable.  I've never had a malfunction of any kind with a Glock.  I like the factory RSA, but for heavier loads I need to be able to install a stronger spring.  The frame is made of plastic, the RS guide can be too except for spring changes it's fine.

I use the 20 pound spring to be best for me for all around.
I bought a stainless steel guide rod from LWD and an ISMI flat spring.
For Gen 4 they also sell an adapter to fit the guide rod to the larger Gen 4
fitting on the end of the slide.
LWD also sells a complete recoil assembly for Gen 4 slide. 

www.lonewolfdist.com/Detail.aspx?PROD=155994
/www.lonewolfdist.com/Detail.aspx?PROD=756358

I got a LWD 6.61 inch barrel almost a year ago. Since I installed it, I haven't tried to use the Glock barrel.
Never a mis-feed of any sort. I also replaced the RSA with a Wolff non-captive part(s).  I have gotten great accuracy with
6.0 gr. Titegroup & 180 gr. Berry plated truncated bullet, and a 20# recoil spring. I also have a 22# spring I use with Underwood
165's.                 

I'm a fan of Underwood and I reload.  I recently bought a box of 220gr Lead 10mm, but I haven't shot it yet
I also have a box of 220gr lead in 10mm Ultimate (40 Super) coming.

Quote from: Kenk on September 04 2017 05:44:37 PM MDT
Hi, so for the gen 4 G20, what would you recommend in a 22 Lb setup, a link to the manafacture's site would be very helpful
Thanks for everyone's help

Ken

I have a G20/3 and a G21/4. I put a Wolff non-captured recoil assembly in the G20 and a Lone Wolf captured assembly in the G21. 

That said: Lone Wolf sells an adapter to fit a Gen 3 style RSA in the Gen 4 slide. It goes on top of the spring, and is secured by the screw, and fits it to the larger opening in the slide.
I have used 20lb springs for Underwood and lesser powered rounds. the 22lb spring works with Underwood and hot handloads, but is too stiff for 'standard'  rounds in my pistol.

The G21 has 20 and 24 pound springs for 45 Underwood +p and 40 Super shooting.  With the adapter it works flawlessly, shoots great.     

I've gotten really good Lone Wolf barrels.  Right now they're having a big sale, some for as low as $75..
I bought 2, a 40Super and a threaded 45 ACP.

I put the Wolff non-captured RSA in my G20 with a 20 pound spring and I also tried a 22 pound spring.
For all around use I use the 20 lb. but for Underwood the 22 lb. works well.  It's too much for standard (S&B & Blazer) to function every-time.

Glock 30S
Underwood 230 +P..