Supported vs unsupported chamber for 1911

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Supported vs unsupported chamber for 1911 Empty Supported vs unsupported chamber for 1911

Post by hengehold on 2/5/2019, 8:29 am

I am a brand new BE shooter and my first goal is to get distinguished with a pistol. I picked up a 9mm 1911 SA RO to get started. Accuracy is not great compared to the custom built 1911 .45 I used to shoot for the USMC. Consequently, I plan to send the RO to Springfield to have a match barrel fitted to slide and with a bushing. One of the options is to have this service with an unsupported chamber or a supported chamber. Supported option is $100 more.

What is the difference between supported vs unsupported and which option would I want in a 9mm 1911 for BE competition ?

Thanks,
-Trevor

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Post by james r chapman on 2/5/2019, 8:44 am

Your replacing the barrel or just the bushing?
My SA 1911 9mm shoots fine with just a bushing.
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Post by hengehold on 2/5/2019, 8:46 am

I plan to replace the barrel AND bushing so I can have the barrel lugs fitted to the slide for tighter lockup.

-Trevor

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Post by hengehold on 2/5/2019, 8:59 am

I found some pics that helped me understand the difference between supported vs unsupported. From what I read, unsupported is only appropriate for standard .45acp loads. In my case, a 9mm fits into a category of higher chamber pressure and a supported barrel is required, yes?

Anyone loading 9mm for their 1911? Do you have to load the 9mm slow to shoot well at 50yd like the .45acp?

-Trevor

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Post by robert84010 on 2/5/2019, 9:05 am

The difference is $100, just like you said, they shoot the same. Unless you are trying to make major power factor it's unnecessary.  Don't send it to SA.
In their opinion you already have a match barrel.

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Post by STEVE SAMELAK on 2/5/2019, 9:25 am

There are several members of this forum who have a better understanding of what you want to achieve and the skills to get you there.
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Post by LenV on 2/5/2019, 9:36 am

If your sending the (9mm)RO back to Springfield or anyone for that matter you have zero options on what you want. The frame already has a Wilson/Nowlin cut for a supported barrel. Trying to put a non supported barrel leaves a major gap. 

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Post by Wobbley on 2/5/2019, 9:59 am

If you’re a reloader, (and who the hell in this game isn’t) you should opt for a supported chamber.  Especially in 9mm.  Some of the “accuracy” loads are up there in velocity and pressure.
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Post by Jon Eulette on 2/5/2019, 10:16 am

As Len said, your pistol receiver is already cut for the Wilson/Nowlin ramped barrel. You have to stick with that barrel type. Both Kart and KKM make appropriate barrels.
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Post by hengehold on 2/5/2019, 11:17 am

Ok, I now it is obvious that it has a supported chamber and I have no other option but to stay with that feature.

Thanks everyone,
-Trevor

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Post by LenV on 2/5/2019, 12:11 pm

Hengehold, the good news is that you won't have to spend the extra 100.00. That fee was to cut the frame for a supported barrel. The barrels cost the same either way.

Len
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Post by Jon Eulette on 2/5/2019, 3:16 pm

I use predominantly KKM barrels when building ball guns. I highly recommend their barrels. The RO will make an excellent competitive  pistol.
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Post by bruce martindale on 2/5/2019, 3:43 pm

Jon, For ball matches, what twist, recoil spring, and trigger weight do you set 9s up for?

Thanks

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Post by Jon Eulette on 2/5/2019, 3:52 pm

Owner of pistol determines the twist rate based on bullet preference; I use both 16 and 32 twist. 
Because barrel is match fit 10# recoil spring. For ball guns I sometimes provide extra sear spring so pistol can be used for CF matches with 2.5# pull and 4# spring for EIC matches.
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Post by Founder on 2/5/2019, 4:19 pm

The long time members of the forum know that I am a huge advocate for Springfields as the base for a bullseye pistol, but I would NOT recommend their custom shop to accurize one.

I would consider:
KC Crawford
Dave Salyer
Jon Eulette
Will Newton (Paper Puncher Gunworks)
FPK Precision (Paul Fisher)

There are others that I'm sure others will mention, but I must emphasize that you should stick with builders who are experienced in building for bullseye like the ones I named. Springfield just doesn't focus on the same things that the others I mentioned for a successful outcome.

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