Yes, I have quite a few 1911 holsters but when I go to the outdoor range I use my Yaqui holster to practice presentation with my Kimber Ultra, my Springfield 1911A1 and Para P14. The Springfield TRP operator with full rail, now that's a different story.
The h721 is my favorite by far but another favorite is in the dillion catalog. Its the IHL belt slide. Easy to carry and draw from for me anyway. I've tried so many different holsters it isnt funny. Good thing is i always seem to find someone thats looking for a holster, so i sell them one but always buy somthing else. It a viscious cucle lol
for 1911s, only the barrel length is what makes it holster specific (unless it has a rail, then good luck!). like keykutter said, there are a lot of holsters out the 1911. most makers have and can accomodate barrel length options, although the 5" is the classic and (according to me) most popular holster size.
google 1911 holsters and a bunch will pop up to accommodate all budgets.
I think a lot of the sig 1911's have squared off slide profiles that are slightly different than the standard Colts. Sig also makes the 1911 "traditional" with the standard rounded top to the slide. I'm not sure where the C3 lands. I believe all of the internal parts are the same. I don't know how much of a difference the slide profile would make for leather holsters, but I bet for a plastic or kydex holster it might be a problem.
looked it up. gsim is right. i think your best bet would a pancake style holster and NOT something where the leather is boned. unless of course u find a holster maker that makes a c3 specific holster. or u can just buy a leather holster for the barrel length and slowly stretch it out to fit those square-ish corners. good luck
I also have a Sig C3. Be careful ordering a holster. I ordered a holster for my carry gun which is a S&W 1911 ES. The holster will not fit the the C3 due to the slide being different on the the Sig 1911's.