My experience has been the same as Redhawks1's
Ditto the above quote.
I've shot the same 454 Super RedHawk for about 10 years and have done a
lot of 45 Colt shooting in it with no unpleasant experiences (other than the cleaning requirement after a prolonged 45 Colt shooting session.)
I use the RSR as a "test platform" for hi-power 45 Colt load experiments before trying them in the Blackhawks. (This is a
good idea if you want to push the limit of the BlackHawk guns.)
They [45 Colts] shoot quite well in the RSR by any type of examination, especially when considering the specific physical differences in these guns.
(Example: Ruger states their RSR barrels are supposed to be .453" diameter. Mine is .4535" and of the 3 others I've examined, all were .453". I have yet to see a 45 Colt with a bore bigger than .452" even though I know they're out there.)
It is the same relationship [exactly] as any of the 44 Mag/44 Special or 38 Special/357 Mag situations. The pressure differences have no bearing on the issue whatsoever.
The
only concern is that a good amount of fouling
does accumulate in front of the shorter case and
will cause feeding and/or extraction problems if left uncleaned.
That's it.
Rugers will experience bad "case-sticking" of full-power 454 cartridges any time they are not clean. This has nothing at all to do with shooting 45 Colt ctg.s in them. It has to do with the fact that the cylinder of the RSR is made of a "sooper-dooper" space-age steel that can [and does] stretch and snap back when full-power loads are used. The steel snaps back much faster than the brass can and, with the presence of just a little crud, will grip the brass case firmly. This is a well-known situation with RSRs. The only cure is to polish the chambers [of the gross tooling marks that Ruger usually leaves] and keep them clean if you intend to shoot full-power loads all the time.
The best cure, (the one I chose after a about 8 years,) is to throttle back the power a little.
The game certainly can't tell the difference.
The use of 45 Colt loads in a RSR has zero effect on this set of phenomenon when proper cleaning is done.
To add weight to this fact I offer the words found in any Ruger publication saying in effect, to shoot either ctg. to your heart's content.
No one thinks more about
liability than Ruger.
They are the pioneer in factory-produced 454 revolvers and the ONLY company to make a 6-shot model and make it for less than any competitor. They do it with that space-age steel.
They make no claims lightly and their opinion [on this subject] is worth more than any you'll read here.
Relax and enjoy shooting your 45 Colt ammo in the 454 without worrying yourself over the matter.