Tight Chamber in Sig 1911 RCS

[MMH]

I think that I have a tight chamber in my Sig RCS. Most of my 45 ACP reloads do not chamber. Most new factory ammo does, but seems tight. When chambering a round the slide normally stops a 1/4" short. Sometimes I can push the slide shut and other times cannot w/o excessive force & just eject the round. The reloads have no problem chambering in my Sig Tacops & in generap the Tacops runs much smoother.

If I want to polish out the RCS chamber, what is the best way to do it. Or, should I take it to a gunsmith & have him slick up the gun in general. As I said above, the Tacops is significantly smoother in every way.

[Gun]

Remove the barrel, can you drop a round into the chamber?

If not, the chamber needs reaming.

[phill]

Delete

I think that the issue has been well addressed on the other post

[Yellowfin]

What dies are you using? You might not be getting sized all the way down to the base.

[ColtShooter]

What dies are you using? You might not be getting sized all the way down to the base.

Check this. Saw a similar issue with my RCS. It was definitely tighter than say a Rock Island and made me look at my setups more closely. Try FMJ too. Your lead might be a tad large.

[Yellowfin]

Lead bullets may size a little larger but they're soft and compress with crimping. Hey MMH, do you use a Lee FCD at the end of your loading? If not, you might want to do so, and use a Lee sizing die to start with as well or EGW's sizing die. What case gauges do you use?

[IronButt]

What Gun said! Field strip it, remove the barrel & hold it with the chamber pointing straight up. Rounds should easily drop into chamber with a resounding "thunk." Is the problem with factory rounds, just reloads, or both?

[MMH]

What Gun said! Field strip it, remove the barrel & hold it with the chamber pointing straight up. Rounds should easily drop into chamber with a resounding "thunk." Is the problem with factory rounds, just reloads, or both?

I removed the barrel & started dropping rounds in. Factory ammo drops w/ a resounding "thunk". reloads would get hung up. I measured the case by the mouth. Factory ammo was 0.468", my reloads were 0.471" . The reloading manual said 0.473" (I guess this is SAAMI), so, I now I know why the factory ammo chambers & the reloads do not. Question is, why is the barrel not cut to accept SAAMI sized ammo? Nonetheless, I will try a Lee FCD die.

[billm67]

I am a big fan of the lee factory crimp dies. As I have had Hornady and Rcbs carbide dies sets for my pistols long before I had my Dillon 550, I add a factory crimp die to each set up when I put it on the 550. I recently started using their bulge buster kit with a factory crimp die on my 40 sw brass to get rid of glock bulge.