Yup, but .434" throat diameters aren't the worst I've seen, that dubious award goes to the Taurus Judge revolvers and their .458 throats, however I'm not sure if that has to do with those being .410 chambers, but whatever the case it means .45 Colt leads bad. The only good news is that there are bullets you can use to avoid this.
The options are use powder coated bullets or copper jacketed/plated bullets. Berry's does make a plated .429 bullet that will be just fine with .44 Special velocities, but it has no crimping groove or cannelure and I've found bullets that lack either don't shoot too well in my revolvers because I can't get a good crimp.
You could try the Missouri Bullets with their "Hi-Tek" coating. I believe it's a polymer coated bullet and the good thing about it is it has a crimp groove. I've never shot any of their bullets before, but I think for my revolvers with big throats I'm going to use their bullets. They have plenty of options for .38/.357, .44 Spl/Mag, and .45 Colt. Unfortunately, like everyone else, they have a severe lack of .32 bullets.
Missouri Bullets also uses bullets with a softer 12 BHN hardness for the lower velocity Specials, and a harder 18 BHN for the magnums. That's really nice of them to do because if all you want to shoot is .44 Special or .45 Colt in a Taurus Judge, you get an ideal bullet hardness. Unfortunately for .327 shooters like myself, they only have the soft bullets so I'm stuck using them in reduced velocity loadings or .32 Mag.
I edited my original post with the correct number.
