I find R17 provides better speed and same accuracy as H4350.....And you can get a steady supply.....
I really like Re 17, in my .260. I did find that in the summer time, the load that I liked was too hot for my second rifle. I backed off about .7 grain to get a load that both rifles liked for my summer depredation deer hunting. With the 129 Interlock, I get 1/2 moa @ 2950 (it was over 3000 originally).