Does not bother me to use lead bullets with lube in the grooves. Most of them I think are back in the case neck where the lube can not get on the sides of the case.

Maybe I will read the article again but I understood grease if sloppily  applied to the spitzer would migrate to the case eventually and keep the sides of the case from gripping the chamber. Too much thrust on the bolts was the source of the failures. They have a couple of photos in the article. All this happened in the first few years of the 1903 especially in completion. Gilding metal, Luballoy and other formulated copper jackets ended the era of applying Mobil Lube to the bullets before firing. Cleaning the chamber of any lube is always a good idea for a gun that may have been stored form a long time with an oiled bore.