Bighorn Origin actions are your friend if you want to build one. 6.8 bolt.
MDT mag.
http://www.chpws.com/
If you’re doing a bolt and hand loading what about a 220 Thunderbolt. You’re going to max out in the Valkyrie at 2900-2950 and wear out some brass. Thunderbolt in a bolt goes 3000 pretty...
I’d think you could with shortening it a bit.
243 is around .452-.453 at the base of the shoulder, Dasher is .459.
With the improved shoulder on the Dasher it should be ok to run a reamer up in there and with the shortened chamber, be ok to set headspace.
I’d probably lean Dasher because of...
Not that rifle but an AR in the Grendel. Fun cartridge and probably a lot more “able” than it gets credit for.
In an AR you’re limited by mag length but may have a little more room in the bolt.
The Speer 120 Gold Dot May be terrific for a bonded bullet in it. My AR likes them.
The various 123 gr...
I believe they should speed up.
Even if hand lapped there is still lots of bumps and such in there. As they wear down resistance and drag should lower at least to a point.
Whether or not you buy the fire lapping method, the smoothing of the various inconsistencies is the idea behind that.
Scotty...
I agree.
I am a huge H4831 fan. Just seems to fit many of what I load for with good results. I always have quite a bit on hand. I could also find it back during the component disaster a few years back.
4895 is another favorite.