I've not had too much experience with my the 257 Wby, yet, but so far I've had great luck with 100 grain Barnes Tipped TSX bullets with IMR-7828. I have a Remington M700 LSS Limited that shoots just under 1/2" at 100 yards with that bullet and 71.0 grains of IMR-7828. Don't know the velocity and I really don't care because of the great accuracy. The books say this should be running in the 3500fps ballpark and is at or near MAX LOAD depending on the source of the data, and I have no pressure signs in my rifle. All I do know is that when that TSX goes though a deer's heart, it's not going to matter if it left the barrel at 3450 or 3550 fps, 'cause the deer is going down just as fast either way. Accuracy is WAY more important that raw speed, IMO, though the 257 Roy has plenty of the latter just by its nature.

I've also got a load workup started with 7828 and 110gr Nosler Accubonds which I've loaded but have yet to shoot.

I am also not using .257 Wby cases (important note). At the time .257 Wby brass was not available, so I bought .270 Wby brass and necked them down with excellent results. I've also had some very promising results with reformed 7mm Rem Mag brass, with fire-forming loads running sub-MOA (though just barely).

I just used the last of my IMR-7828, so I need to try to find some more and rework the load (lot numbers won't be the same). Given that I'll have to rework the load anyway, I've been considering trying RL-25, H-1000 or even Retumbo, depending on what's available. I haven't seen a lot of Retumbo data for the 257 Roy, but its burn rate suggests it might have good potential with heavier bullets in the 110-120 grain range.

Mike