Middlefork Miner: What a coincidence - a Remington Model 550 followed me home from a gunshow just two days ago (Friday July 13th).
I bought it more as a collector/investment (got it real cheap!) piece and probably won't fire it but offer it up again at the upcoming gunshows here in western Montana later this month.
I will pass along the info I got here to the new owner when I sell it.
Best of luck with yours if you decide to try the 550
I also have a Remington 552 (semi-auto) that does function very reliably with 22 L.R. ammo (never tried any of the lesser powered offerings) - and it looks good, so that may be an option for you!.
Hold into the wind
VarmintGuy