when standard velocity ammo was plentiful
Just for the sake of info, this is a common error. The ammo that is most common, most available, most used, cheapest in priced and typically bought in bulk packs of 325 or 375 or 525 or 575 or in bricks (10 boxes of 50rds each) is
not standard velocity ammo.
Basic, general, average .22LR became
High Velocity a long, LONG time ago. Someone else can cite a historical reference, but I know the Colt Woodsman pistols upgraded their spec's to match the ammo in the early 1930's.
These days,
Standard velocity ammo is available and it's more expensive than most all .22LR on the market. It is -THE- choice for serious target work and competition shooting. CCI Green Tag, Winchester T22, the Remington in the blue/green box, just about anything from Eley and countless others. This is today's "standard velocity" ammo.
Standard Vel and High Vel are also not to be confused with
Hyper Velocity ammo, which is your CCI Stingers, Velocitors, the Reming Viper/Yellow Jacket, etc etc.