It might not be the fault of the brass temper. Sometimes rim thickness can cause issues. I ran into this loading for my 1895 Winchester in .35 Win. I found some brass made from .405 Win brass and I noticed they chamber hard and sometimes wouldnt fire at all, and were sticky to extract. Brass made by Quality Cartridge works great, you might check their site as they offer lots of brass for the oldies.I may have some local
Have 50 pcs of Jamison Brass that appears to be soft as loads are sticking