JetMech
posted this
24 August 2023
I hate to love the 38-55, but I do. Original rifles from the pre-smokeless days usually had a true .380" groove. After the introduction of the 375 Winchester, the "updated" version of the 38-55, manufacturers seem to be unaware of the differences.
The current 38-55s are just about all using 375 barrels. That's why grooves usually run in .376-.377 versus the .379 called out in the spec.
I have the opposite problem. My H&R Target rifle has a 38-55 barrel that slugs right at .379 but with a 375 chamber.
The result is that my .380" Lyman 375166s will not chamber safely. There's a slight slip fit into the chamber but no clearance for case expansion at the neck. The other, typical bullet molds called out cast a smaller bullet, appropriate for the current Winchester 38-55s