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WAIT. First issue, this is an "Old Model" right? Aka "three screw"?
Is it possible you have a gun that started life as a 357 and got converted to 45LC? If so, you have a mid-frame gun, and that means no +P loads.
Most gunsmiths wouldn't set up a combination like that, because it would result in an unusually weak Ruger 45LC. Of course, Ruger themselves did exactly that with the mid-frame New Vaquero in 45LC starting in 2004 so go figure - but Ruger so far hasn't built an adjustable-sight mid-frame in 45LC. 44Spl, yes, 357, sure. Not a 45.
The 265gr loads should absolutely chamber in a large-frame Ruger 45 single action. I think so anyhow. If they won't, it makes me suspect you have a mutant on your hands.
You really, REALLY need to figure out exactly what you've got before shooting any 45LC+P loads. If it's a converted mid-frame, the gnarliest 45LC+Ps could grenade it in one shot...Buffalo Bore's 325gr monster comes rapidly to mind.
Run the serial number past Ruger, or compare the dimensions to other known-stock examples. Start with the cylinder dimensions, length and width.
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Jim March
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