Here's a bunch of 257R info and data. www.24hourcampfire.com/ubbthreads/ubbthreads.php/ubb/showflat/Number/10163944

DF


Edited to summarize a few good loads.

115 NBT, 44 H-4350. .35" group out of the Brux barrel. That is over book, but book loads are pretty weak. I guess one could call these +P. The Roberts is a cousin to the 6mm Rem and it operates above 60K psi. With good brass, why can't the Roberts do the same. Well, IMO, it can.

JB had reported that the 115 NPT did very well with 45 gr. H-4350. In my gun, the NBT was more accurate than the NPT.

I found an 8# jug of H-4350 at Powder Valley, free shipping, but had to pay the Haz Mat. I had been using 4451, but was glad to find a good supply of H-4350.

The Enduron series is pretty temp stable, but from what I've read, not quite as good as the Extreme, Australian series. And of those, H-4350 is one of the best. Now, I don't hunt sub zero, but do like H-4350. 4451 has the de coppering agent, but with DBC treated barrels, I don't have a fouling problem with H-4350. A soak or two with Patch Out does the trick. No brushes after DBC.


Last edited by Dirtfarmer; 10/30/18.