Anyway, I recommend trying to find the later, dash 7 or higher, 45LC's, as most 45 caliber bullets are 0.452 in diameter.
I'm not disputing your suggestion or information and everyone knows the reliability of information on the internet but I had heard that S&W fixed the throats on later production runs on Model 25-5's. Just consider the source.
My 6" Model 25-5 was purchased new back in the day and it seems to shoot as well as any other revolvers that I have. At the time I obtained the 25-5, I was shooting alot IHMSA silhouette. I had to press the 25-5 into service for one match after I cracked the forcing cone on the Model 19 I was using for revolver class. I could reliably hit the 200 meter rams with the 25-5 once I figured out the hold over I needed for the 45 Colt cartridge and its rainbow trajectory.
Of course, some accuracy issues may be related to the "loose nut" located between the trigger and sight picture.
I shoot mostly cast or powder coated bullets in the 6" 25-5 but plated and jacketed perform well. I've not made any attempt to find .454" dia bullets.
My 4" and 8-3/8" 25-5's were made within 6-8 months or so as the 6" but I really have not put many rounds through them. I have not been disappointed in them--yet.
Maybe I'll see if I can find a -7 or newer 45 Colt Model and see how it compares to my 25-5's. You just cannot have too many 45 Colt revolvers especially if they are a Model 25.
Thanks for your good information.