The bore should be .451. It's fairly common for the Ruger cylinder throats to be undersize for shooting .452 cast bullets. Many have them reamed to .4525. Your measurements are pretty close to both of those so you are probably good to go...at the very least with jacketed bullets. If you want to shoot .452 cast bullets I'd first see how it shoots for accuracy and leading with them. If you are not satisfied I'd have the throats measured accurately with pin gauges and reamed to .4525 if needed. There is a lot of good info specific to this issue over at rugerforum.com. If you are going to shoot and reload for Rugers you really ought to join that forum.
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