17 April 2022
my brand new Cimarron 1894 would not reliably cycle the long Starline brass. I got a few long and short Starline pieces to test. Test pieces functioned but when I bought the 250 bag, they would not. And some were a tad longer than 2.125".
Quick test load I used was 22.0 grns of IMR-4198. 25 yd indoor group was 1.18" offhand. So prob < 3" at 75 yds in the deer woods with a rest out of the stand. Perfectly usable where I hunt. I AM using peep sights (had top receiver d&t'd for Skinner peeps) cause I can't see/use std buckhorns...
Mine seems to hang up too with the short brass. The cartridge rim seems to be at the very back of the receiver recess. I have tried a more deep crimp to ensure a smooth surface and the impingement seems to be at the crimp point AND at the case rim in the relief groove on the receiver wall. Now having said all that, I learned with my 1886 in 45-90, that these rifles like to be cycled aggressively. Such is the case with this 1894 too. If I "go for it", the cases cycle OK. It just seems to be a very unnecessary act to have to cycle so hard.
I am wanting that long brass for the mouth wall thickness primarily. My chamber cast indicates that Uberti is chambering these using a cutter made from an original rifle chamber cast. This chamber is definately a pre-SAAMI chamber. Measurements and experiments bear that out! Call me crazy, but I knew all this before I ordered this specific rifle. Cimarron commissioned these rifles from Uberti and to my eye, they are the most beautiful and functional reproductions. One does need to be an experienced handloader/bullet caster to make this rifle sing.
With the longer brass, I know I can always trim it to the perfect length for a specific bullet. So far, that Lee bullet is doing just fine but as you know, I will play with others as well. I have some commercially cast "hard" bullets from Hunters Supply but they have to be resized to .377 to fit this chamber with Winchester brass.
With rifle in hand, I confidently go forth into the darkness.