Modern air rifles are cheap to shoot and are more versatile. But .22 rifles bring more velocity and downrange accuracy.
In the 1920s, the Finnish Defense Forces wanted a cheap, low-power trainer for marksmanship on small ranges, so instead of rimfire conversion inserts they commissioned dedicated .22 LR m/91 Mosins.
The Bergara BMR Carbon is a shining example of why the rimfire rifle is one of our most beloved firearms. In addition to being the king of small game, the .22 LR is a trainer, plinker, and competitor.