Two of the guns listed in these threads as damaged were shot using Woodleighs.

As for the most popular monometal bullet, bwananelson gets the prize for most creative.

But wrong...BB's are steel, copper washed.

The copper-alloy monolithic bullet I had in mind is the French service load for the Lebel rifle, the Balle D loading which was a solid bronze bullet of about 197 grain weight, of which many, many millions were fired through all sorts of rifles and machine guns. I do not know what the total production was but including service in the Great War I suspect the total number surpassed a billion. Remembering the Steyr mentioned in the thread, I have never heard of a case of osr showing up on the outside of any service rifle barrels as reported from any surplus collector. It would be interesting to go looking for it.

Most Berthier and Lebel and Hotchkiss barrels are thicker to be sure than the worrisome doubles reported, but some surprisingly thin indeed.

Smith and Smith reports service pressure of the Balle D loading to be "38,000" pounds {not sure exactly what this means; CUP, PSI, etc}.

Labbett & Meade in ".303 Inch" report recurring experiments and trials using various monometal bullets with the only mention of trouble being a reported increased barrel wear.

I do not know what the alloy of the bronze/brass bullets were, but the French bullet was not banded. Some British experimental bullets were.

BTW: the reported extrusion of a tit of lead out the butt-end of a Woodleigh means nothing other than the fact that metal was displaced. Obviously. In the case of a banded bullet, the metal from each band is displaced laterally to some degree and mostly longitudinally into the grooves. If too hard, such a method of displacement may not be sufficient and it would seem obvious that such a bullet could cause damage but nevertheless, I would think the damage if occuring must occur in the first very short trip of the bullet in the bore.

That's why I am having trouble seeing how osr could run the length of the barrel. Once engraved, the bullet, any bullet, is no longer exerting outward forces against the lands unless under the force of obturation which has already been stated not to occur with monometal bullets but does with lead core bullets. Or, rather, should. Poor setup in the bore can be a factor even of lead core bullets, particularly solid base soft points and occurs all the time. It can be seen readily on recovered undersize bullets.