You might need to go carefully as RPA's often have tightish chambers. A few at the club have them in varying models one was shooting some nato spec new 7.62 and was having extraction problems. Carl the range owner asked me to take a look at oen fo the cases they had just knocked out with a cleanign rid and the primer was well ironed out. I suggested the pressure was a mite high.
The shooter and shooter and owner of the new RPA said the loads, new commercial contract stuff, had been pressure tested
my answer was well it might have been but in THAT RIFLE IT'S TOO MUCH, he took the huff and left and I have not seen him since . Oh he owns the comanpy which is manufacturing the loads
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It's fairly obvious even without measuring the fired cases that in that particular RPA the chamber is on the tight side of the specs. Not a bad thing but it will effect handloads to some degree just as the slightly tighter bore on my 25-06 shows pressure signs faster.
I have noticed several of the RPA owners have extraction issues at times but I don't know what ammunition they are using of if it is factory or handloads. All the RPA's I have seen shot there are very accurate and I have shot Carls Rangemaster in 7.62x51 and it too is very accurate.
Now the problem with your question is that every single barrel is different so a load which be super accurate in one rifle might not be so in yours or may show excessive pressure or even the other way and not obturate the case neck fully. You need to work up your own starting by chosing the bullet you want then select a powedr that's suitable and easily obtainable, nothign worse than finding a super load onyl to find you cannot get any more of the powder or bullets
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