Rastus... the Quicksilver 2 stroke oil idea came from a friend (30+ years ago) that at the time had a go-fast boat that was running a Mercury 3L outboard... he had problems with spark plugs fouling ... the Quicksilver oil dissipated carbon for him, and at the time worked well for me shooting a 1911 (back when MB was shooting in the Tampa Bay area)... have used it since, but got away for a time using Hornady One Shot... the One Shot dry lube did not accumulate fouling, but didn't seem to lubricate the firing pins as well as the liquid oil...
as for the number of shots.... Steel Challenge consist of 8 specific target arrays, and there is very active Steel Challenge shooting community here in the Tampa Bay area, offering lots of opportunity to shoot... and with the price of small pistol primers, I can shoot one .22lr cheaper than a primer alone ...one local range has a Friday and Saturday 5 stage match each month, and a practice match (3 target arrays we shoot twice) each non match Friday... the Wyoming Antelope Club in Pinellas Park has a 6 stage match monthly, and Gun Craft range in Ruskin has a complete 8 stage match monthly...5 shots (minimum) per stage, 5 runs is 25 rounds per stage x 5 or 8 stages is 125-200 minimum a match...so I'm averaging over 1200/month... the .22lr is much harder on equipment than any of the other shooting sports I've be in... regards Les