Do you believe that a duty size carry gun can make a good ccw if you can conceal well and manage the weight?
I sure love my Springfield SA-35
I carried a K frame .357 (S&W Model 19) IWB for many years. A good holster and good belt make all the difference.
I carried a 1911 on and off duty for years.
I regularly carry a duty sized handgun concealed in an OWB holster of my own, or commercial make. And like many here, I find that I'm better with them at any distance than the sub-compacts usually recommended for defensive carry. I find that a bigger framed gun is easier to manipulate, handles recoil for 2nd shots better, and has a greater inter-sight distance which is a boon to better accuracy.
I've used all of the types handguns mentioned above for CC....and I'll readily admit, that it's probably a lot easier to accomplish in a well designed OWB holster, than an IWB or AIWB.
In my experience, the holster with a good heavy gun belt are keys to comfortable success, but note that you need to make sensible wardrobe choices. Speedos with a wife beater t-shirt will no doubt make 'Duty' size guns extremely hard to conceal. But if you can manage a loose fitting t-shirt with a moderately long tail for summer use, most any Duty size gun can be hidden. Here in Ky, fall, winter and spring weather makes CC easy.
My summer wardrobe for daily wear is usually jeans or cargo shorts and a t-shirt, and I buy my "T's" extra long to allow use as a cover tor my holstered CC piece. I've found that holsters of the Askins Avenger type offer good concealment; especially the butt of the gun, which is pulled in by the aft belt loop. I build or by them as high as I can get them and still allow a speedy draw without extravagant body contortions.
Below are my BHP & Springfield Hi Powers, and front and back views of an old Bianchi version of the Avenger. Note the belt loop locations and the gap allowing a full firing grips to be obtained while the gun is still fully holstered. If interested there are several other commercial makers that offer quality built rigs of the same type. Best regards, Rod