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Yes, the same load data is used for both 45acp and 45AR. I agree, the 6.0 W231 with a 255 in 45AR or 45acp is way past any published data I have ever seen.

45 AR is 45 Auto Rim........It is the 45acp with a rimmed case so you can shoot it in revolvers without using moon clips. I do not believe anyone is currently producing factory ammo, but you can still buy new 45AR revolvers and Starline still produces brass in this caliber. It is a fun caliber to shoot and very accurate.

This caliber has an interesting story behind it, too long for me to type. Google it and you will probably find several articles about it.

Load data for the 45AR is the same as 45acp. Hodgdon lists a maximum of 5.3 gr W231 for the 230 gr bullet in 45acp. They do not publish any data for a 255 / 260 bullet in either acp or AR. If you are loading 6.0 in a 260 gr bullet then you would be way past "a little too hot". The primers are sending you a message.

I saw two 45acp kb's within minutes of each other a few weeks ago at ASC. Same load in both 1911's, W231 with 260 gr bullet. Personally I would not use anything over 230 gr in the 45acp or AR.