The ruger #1 is tricky to get to shoot extremely accurately. Plus the relatively light weight for such a large cartridge. The recoil with out a brake is a slobber knocker for sure.
I shoot a 338 Lapua Ack Imp and I think that is a better cartridge to go to. Good brass, easy to get and cost is only $1 each and last a long time. Mine is only 2875 fps right now, but I am 5 grains below max also. You can run the 338 Lapua AI at over 3000 fps with 300 gr SMKs.
I think I would look at a good custom action single shot with the 338 Lapua AI. If you want a bolt and mag go with CZ 550. Bruce Baer is selling the Lawton actions right now for $795 on an action that is 1.60" in diameter and has a 3/4 bolt diameter and any bolt port configuration, so it is plenty of action to use for either cartridge. Go to his website and look at his Baer line of cartridges which are basically the same and proven. www.baercustomrifles.com
BR quality and all you need to do is add trigger (Rem), barrel $500 and stock (take your pick)