All Lefever guns LACA or crossbolts were built prior to non-corosive priming. The bad affect of corrosive primers didn't really show up until the use of smokeless powders became common. Water was a common cleaner for black powder & it also took care of the primer residue. This was particularly noticable on early smokeless .22 RFs as the priming charge was high in proportion to the powder charge.
The American Rifleman ran an extensive report on this some years back & if I am remembering correctly non-sorrosive priming didn't really take place until up in the 1930's. Remington was a major contributor to the NC priming with their "Kleen-Bore" primers. The Army did not switch even then as the NC primers were not as long lifed as the older ones in storage. I believe that Julian Hatcher discusses this also in his "Notebook".
The general conclusion seemed to be from these accounts that more bores became pitted & ruined with the combination of corrosive primers with smokeless powder than were ever damaged by the use of black powder.
