My 38/40 Smith.
Model 28, after a little trip to Alan Harton, in Texas.
Now, I"ve got 5 38/40s (6, counting the 1889 Marlin I don't shoot). That one, a 1916-vintage 92 Winchester, a 1916-vintage New Service and a pair of US Firearms SAAs.
They have, apparently, changed the chamber dimensions in the last 80 years. All five guns shoot factory ammo with no problems. I have dies by both Lee and RCBS. The Winchester, the Colt and the converted Smith take my reloads, but the USFA won't. The sizing die does not push the shoulder back far enough. A simple solution is to shorten the sizing die a little bit (approximately .100"), but I haven't done it.
The guns, themselves, are beautiful, and extremely accurate. But the factory stuff is costly, and since the reloads don't fit, they don't get shot as much as the Smith and (dare I say it?) the Colt.