With regard to "solids" or FMJs. You can't have it both ways IMO. If the jacket is too soft or too weak you get penetration/break-up issues. If too hard you get the claims of being too hard on barrels. The raised ribs on some modern designs might fix that if they shoot well in one's DR.

But in the end, how many solids/FMJs is one shooting in one's rifles? Most times we use the SPs and FMJs for backup. Other than elephant most use a SP as the primary projectile. And realistically how many elephants is a modern hunter likely to shoot in a lifetime today. Cullers seem to use other rifles on different criteria too. SPs can be used for practice and are cheaper too.

But I know I won't be using a convential mono-metal bullet in my vintage DR. I would use a true raised rib mono though especially if they as "looses" as claimed. But I don't have any problem in using Woodleigh FMJs for the amount of actual hunting use I will be using them for. JMO.