Try this:
Your revolver will tell you what diameter bullets it wants. Simply remove the cylinder and point it at the ground. Get ahold of some .452 bullets and some .454 bullets. Drop a bullet into a chamber. What happens? If the bullet drops right through, it is too small. If it hangs up and requires a gentle shove with a pencil to push it through, it is perfect. If it hangs up and requires a lot of force to shove it through the chamber throat, it is too big. Pretty simple. Try this test with both .452 and .454 bullets, be sure to try it in several chambers. The cylinder will tell you what diameter bullets it wants.
Driftwood Johnson said this well on Apr 5, 2015! I am merely quoting him!
Try this and then PM me with your contact info.