I have one and absolutely love mine. I have only used RL22 and never wanted to try anything else because that works so well out of mine.
The best load I have shot out of mine is with a Hornady 225gr SP Interlock. With 88.5 grains of RL22 My best groups are between .5 and .75 inches. (I had all of my group sizes and etc. on a spreadsheet, not backed up of course and lost the hard drive, so I have to go from memory and start over. At least I had my 'favorite' loads wrote down.
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Next best load was with 89 gr. of RL22 and a 210gr Scirocco.
I was not happy with the results I was getting from the Nosler 225gr Accubond or the the Sierra 215gr SP BT.
I might be able to improve on those last two with different loads, but am not sure if I want to try, I am getting such good results with the top two.
Are you loading for yours yet? If so let's hear how it is going.