Duplex load issue

[PJ Hardtack]

Having had great success with a 50-70 duplex load that consisted of 60 FFg/5 SR4759 in both my Shiloh carbine and Military Rifle, I loaded up a batch with 5 more grs FFg and the 5 grs 4759. More is better, right? Wrong!

It required more compression (yes, I use a compression die), and that distorted the cases to where one brand would not chamber in the current-made carbine. The  chamber of the MR accepts anything I feed it.

Recoil was definitely more noticeable, and it was very clean burning, but accuracy in both dropped dramatically. I'm going back to my original load. Hot rodding a 50-70 doesn't work.

[Grapeshot]

If you still want to get a clean burn on your 50-70, I suggest that you use 4Fg in place of your 4759 and light compression.  You should get the same clean burn without the punishment and your accuracy may improve.

[PJ Hardtack]

I've had no problems with a duplex load using 60 grs/5-SR4759 or 65 grs 100% BP. Recoil with either is quite acceptable. Another load I found recommended 5 grs 5744 instead of 4759. Some use 3031.

I get a longer string of shots without the need to wipe the bore with the duplex. T'other day, I fired a few rds loaded with 28 grs 5744 after shooting several BP loads and the bore looked great!

There's more than one way to skin a cat or load a 50-70, that's fer shure ....