45 70 Loads
Can anyone recommend some good 45 70 loads. I am just starting to reload for this particular round. Rifle is a new Marlin XLR with 24" barrel and WW Guns ghost ring sights. I caught a deal on Cast Performance 460gr WLFNGC, about 300 bullets. I started using WLR primers and AA 2015 mainly due to the fact that I could not find much other data for the bullet. I have tried 39gr, 40, 41, 42 gr. The 39 gr load seemed most accurate. Is this bullet too heavy? Should I stick with cast or jacketed bullets?
Would I be better off shooting a lighter bullet and getting slightly higher velocity? I mainly want a good accurate 50-100 yard load for various medium game. Any 45 70 expert advise would be appreciated.
I used 46gr IMR3031 with that same bullet in my guide gun, and was able to get 1600 fps (chrony'd). Start low, and work up.
RL 10 works well for me with this bullet. Starting load for RL 10 is 40 grains (velocity 1545). The load I finally settled on was 43 grains (velocity 1620) ...this was the load my rifle liked best. COL was 2.525"
I must say, although I'm not very sensitive to recoil...this load is pretty stiff!
I cannot emphasize enough the importance of properly crimping this load ....actually any 45/70 load should have a good crimp. Ensure the crimp is tight and uniform; or you will experience ignition problems or bullet setback (not very fun). I use a Lee factory crimp die...best crimps I've ever had. If you don't have a Lee FCD, ensure you crimp in a separate operation after seating or you risk crushing your case. Speaking of seating, don't be surprised if you cut a ring into the top of the bullet with your seating plug. I had to have RCBS make me a seater plug to accommodate this bullet properly. Even though it may cut a ring in the nose, it really doesn't affect the performance of the cartridge, I just got tired of cleaning the lead off my seater plug all the time.
This is what I loaded in my 45/70 when I had the 26" Marlin Cowboy.
I worked up some loads with IMR 4198 and speer 400 grain bullets. This is in my marlin cowboy rifle.
I plan on checking 48 grains to 50 grains again this spring in 50* weather. I think they will be just fine. It was 20*F outside today.
I also shot 600 barnes originals in it
28 grains of IMR4198 went 939 fps
30 grains went 1122 fps