Converting a 1911 10mm to 40 S&W


August 25, 2008, 07:20 PM
I read a previous post talking about converting a 45 1911 to 10mm. It sounded like a PITA. Does anyone have any experience converting a 10mm 1911 to 40 S&W?


If you enjoyed reading about "Converting a 1911 10mm to 40 S&W" here in archive, you'll LOVE our community. Come join today for the full version!
August 25, 2008, 08:55 PM
Should just need a .40S&W barrel and .40S&W magazine, although your 10mm mags might work.

OTOH I don't think 10mm 1911s are much easier to find than ones that come in .40S&W.


August 25, 2008, 10:38 PM
Also a lighter recoil spring. I use a 17 lb. in my .40 1911.

August 26, 2008, 12:16 PM
Fit a 40S&W barrel. That should be it.

I would not invest in new springs or mags until I had issues. Most 10mm guys immediately get stiffer springs, so the stock ones will probably be fine unless you run really light loaded 40's. The mags are frequently identical.

August 26, 2008, 06:51 PM
To switch a 10mm 1911 to .40 S&W, the following should be done.

1) Fit new barrel and barrel bushing.
2) If loading .40 S&W long, use 10mm magazines. If not, try 10mm magazines. If you have magazine issues, buy some .40 S&W magazines.
3) Match new recoil spring to your load.

I basically went the other way when I switched my SVI from .40 S&W to 10mm.

August 26, 2008, 09:33 PM
Get into reloading, and reduce some loads:) Kinda like shooting 38s from a 357Mag;)

September 9, 2008, 11:42 PM
Hey guys, I'm thinking about doing the same thing with my Kimber 10mm. I like it, and even reload, but I shoot .40 way more than 10mm and it seems like my expensive Kimber just sits around.

I see KKM and Jarvis and Barsto offer barrels, but what, if any ramp style do I need? What setup do you guys have?

September 10, 2008, 10:38 AM
SDGlock23 - Call up one of the above and ask them what ramp cut is standard on your Kimber. They will probably know, or at least be able to tell you what to measure to find out. I am ignorant of the differences, and 2 minutes on Google didn't enlighten me, other than the frame cut is different (maybe).

JDGray - That was my first impression too. However, on second thought, 40S&W brass is essentially free to pick up at the ranges I go to. I typically lose about 10-15% of my 10mm brass on a visit (brass that gets tossed forward into no man's land). Being able to come home with 10-15% more brass instead of less is attractive.

A little futher reading on google links I found this thread at 1911forum ( Indicates a Nowlin ramp.

September 10, 2008, 07:38 PM
I appreciate your help sqlbullet.

If you enjoyed reading about "Converting a 1911 10mm to 40 S&W" here in archive, you'll LOVE our community. Come join today for the full version!