I owned a "shooter" Sask Jubilee one time, the bore slugged at 378 but the chamber would only accommodate .375 loaded in WW brass so the proper bullets for the gun wouldn't chamber at all and the .375 slugs shot "minute of target board".
Mine was perfect, groove dia was 378 > 379 and any bullet larger than 380 would not chamber. The Winchester Commemorative rifles were the most incosistently made rifles I've ever had the pleasure of owning.
Before firing it, do your research.
First: 375 Brass doesn't belong in a 38-55. It's short, the walls are too thick and the internal volume is less than 38-55 brass. 38-55 data would not apply.
- 30-30 brass is thin enough, but very short.
- Jacketed and/or any bullet smaller than 378/379 is a waste of time shooting.
- Cast your own or buy cast bullets.
- If you cast your own, the LEE mold MOLD DC 379-250-RF throws a pretty good bullet. I trimmed my mold so it cast w/o the bevel base.
- H4198, Rx-7, SR4759 and 5744 will be your friend.
It is a fun caliber to shoot, and other than the 379 bullet, pretty straightforward to load for. Starline makes brass, two different lengths, SAAMI length (2.080) and 2.125, you pick. BTW 30-30 brass starts at 2.039 and after expanding to the 38-55 chamber it is shorter yet. 375 brass starts at 2.02, is thick and is smaller internally.
Nitro




















































