Jack....Very interesting on the Rem.180 gr bullet. It just goes to show you what I have said about all these pictures of peferct mushroomed bullets....It's BS! When a bullet reaches a certian velocity impact limit it goes to pieces! That same bullet, with a factory load, holds together and penetrates great in the hanfguns and rifles chambered for .357 Mag. The word has come back to me from South Florida that the Hornady 180 HP/XTP is looking real good. As of yet I don't know what they are loading it at. I want to find out so the boys, during our tests, can compare it against our control load of 16 grs WW296/H110 and the BTB 185 FNGC is the handguns.
Now...As far as IMR3031 is concerned. If I could have only one powder for all rifle applications, it most likely be IMR3031. The only reason we switched over to RE7 for the .35 Rem is the tests that both Layne Simpson and Ken Waters did. For some reason it seems to be the most accurate load. I always thought it was a little on the fast side for 200 gr bullets, but that didn't pan out. They shot the 200 gr Rem CL with 37 grs of IMR for a velocity of 2080'/" in a 20" barrel at 34,000 psi. Well under the agreed working pressure of 40,000 psi for the Marlin 336 series. I feel that 34 grs of Re7, still under the 40,000 psi @ 2185'/" (20" barrel) is as hot as I want to go. We did run up some 45,000 psi loads in a Rem.760 with the Speer 180 gr spitzer, but accuracy fell off above 40,000 psi. Going back down to the 34 grs of Re7 in the Rem.760 with a 4X scope...it shot just as good a groups as any other caliber in that rifle.
Best Regards, James Oh Yes, The "new" Hornady 200 still does not expand as we want it!....jcg