I had purchased a 350 grain gas check mold from Saeco to try with my 45-70, 1886 Winchester. I finally got out to the range Sunday.
Starting with 45 grains of RL-7 and going to 46.5 grains in half grain increments. The accuracy was not bad for any of the loads. The main difference between all of the loads is they got a bit higher, maybe a half inch with each half grain increase.
This is contrary to my experience in the past, with other rifles and calibers. For me, as I increased the powder charge the center of the group would go down.
I'll get better groups when I get the tang sight installed as the buckhorn does leave a lot to be desired, as far as being precise.
What I find so interesting with both of my 45-70 is the point of impact does not vary to much. My Siamese Mauser will put 405's, 445's and 500's all with in the same 2 inch circle. This new 1886 seems to do the same with 445 grain slugs and these new 350 grain.
Jim