I have just come into a fairly large quantity of Win Large Rifle MAGNUM primers. Has anyone ever used magnum primers in a 6.5x55 load. I am reloading for a Ruger MkII and use slow powders, mostly RL-22 and H4831. I feel like the Ruger will handle the likely increase in pressure but will accuracy likely suffer?

My normal load is 48gr of RL-22, Rem case and WLR primer behind a 140gr GameKing at around 2650 fps.

Thanks in advance for the replies.