If your model 70 originally came in .300 H&H, that is a pretty rare bird indeed!!! My brother loads his 30-06 Model 70 classic Sporter up to what I can "300 H&H Lite" velocities with 165 Game Kings and 180 Partitions. The H&H is pretty close to the 300 Win Mag in factory loads, but my brothers .300 WSM is actually a bit faster. With that said, remember that the H&H is pretty much loaded to original specs which is to say 1925! A LOT of the improvement in gunpowder came as a result of US artillery propellant developed before and during WW2. Those powders were he basis for Roy Weatherby's loads in the late 40's and early 50's. Before that, we were lagging a bit behind the Germans. That's why the old 8mm Mauser could run pretty close to the original 30-06 load even with bigger bullet and smaller case capacity. The factory spec for a 180 grain in the H&H is 2880 fps, but the normal "safe" reload will run that same bullet out at close to 3100 fps. Supposedly, you don't need a 26 inch barrel either with the factory loads, but can get away with the 24 incher like with the WSMs. The funny part about the H&H is even though it does not have the fat, straight walled case that you are supposed to need for super accuracy and efficiency, it is supposedly a tack driver. It also has a longer neck than a 300 Win Mag, so maybe less problem with long, heavy bullets. My understanding is the 200 grain plus bullets is where the 300 Weatherby really outshines the standard length magnums. One of the gun writers made a 300 H&H wildcat a few years back that had the case blown out to more of a 30-06 30-06 Ackley improved type case taper and shoulder profile and what he found was that it really wasn't enough of an improvement over the good old original to really be worth the effort. It mostly just burned up more powder for not a whole lot of gain. I think it would be cool to to rechamber a new 30-06 FN built Model 70 Super Grade in 300 H&H.
Last edited by jdm61; 01/18/14.
