I got started reading the Jack O'Connor column in Outdoor Life magazine. 60's. Jack mentioned the old .22 centerfires THEN, many, many times. R2Lovell was always in the list. I think it was "Harvey Lovell." (Hervey???) In those days, following WW I, there were two "20 grain" cases. One was straight for the single shots like, say, .45/70 case, only smaller. The other had a neck/bottle neck to make it shorter for the Winchester lever actions. (Last 1873's came in a small action: .25/20 and .32/20 as I recall Madis book.) .25/20 WCF. The Lovell was made by necking down the single shot case. Longer than .22 Hornet. So today you look for .25/20 Single shot if you seek cases. (.25/20 necked down is .218 Bee.) Huntingtons.com and other "odd case' suppliers usually have some. NOT CHEAP. I don't recall Jack O. saying what the "R" was for. It may have had something to do with a Mr. Risley.
The .22 Hornet was originally the .22 WCF loaded with black powder and the "souped up" version with smokeless was the .22 Hornet. I think Jack mentioned that the original guns were marginally strong and the barrels wore out quick with jacketed bullets. Same story for .22 Lovell. Ream an old single shot and get some more "soup" while it lasted... No liability worries like today. LUCK.