A bad Ruger is rare but does happen. I have and have owned so many it is crazy. I still have an original Mark I and 2 Mark III pistols.
Once I bought a new Mark II and could not hit anything, then I seen the bullets were hitting the ground in front of me. Bore looked good and the crown looked good. Ruger sent me a new gun that shot lights out.
I won the Ohio state IHMSA shoot with my Ruger using WW Wildcat ammo. I even hit all the 25 yard shoot off chickens at 100 yards. It was a new gun with no sight settings at all but my spotter seen hits so I missed the first pig, turkey and ram out of 60 shots. I still have it and a stainless slabside that will poke one hole at 25 yards.
Rem made good ammo back then but changed the bullet. WW high velocity was super but the cheap Wildcats shot better. But all changed as speed was needed to make so many .22 rounds. Eley shot poor but RWS R50 ammo shot small holes but had little power left at 100 to knock steel down. Thunder Bolts never shot for me. Bulk WW gives all kinds of reports from cracks to thuds with many fails to even fire. Bulk Fed has a problem too. CCI is not quite as accurate as the old stuff but is consistent. Things have changed and back in the day it was nothing to shoot under 1" at 100 with a Marlin 39 with WW high speed. Hundreds of head shot squirrels with it. I head shot squirrels at 50 with the Mark II off hand. Thunder Bolts shoot better in a fire!
