Major Khan
AH legend
Thank you so much for educating me on this subject , Rookhawk . If I understand things correctly , then only the French brand , Verney Carron offers a warranty for their double barreled rifles to be used with monolithic solid bullets . I admittedly know very little about monolithic solid bullets , because the very 1st monolithic solid bullets ( as manufactured by A Square ) were introduced in 1986 , at least 15 years after I had already retired from professional hunting.The problem with monolithic solids is that they are incredibly hard, and they are incredibly light for their volume. Thus, mono-solids are very large for their weight. Bullets don't like to be bent by double rifle barrels and as such, a mono-solid stands a good chance of "straigtening" your double rifle barrels for you. (translation: a mono-solid being significantly longer than a FMJ lead core bullet, they will break the ribs loose on a double, especially a vintage double)