One of the worst thing about using target bullets for varmints is the RICOCHET FACTOR. Varmint bullets tend to be very fragile and literally explode at ground contact, even in heavy grass, snow etc.
That's also why I don't use deer bullets, since they tend to ricochet more than varmint bullets.
I've seen evidence of .22-250 Rem, varmint hollow point bullet blowup on fairly settled snow at about 100 yards, when I shot an empty .22LR box on top of the snow. The bullet hit the box dead center at 95 yards and there was a puff beyond with pieces of jacket/lead scattered there. The exit hole was even a bit larger than the entry. There was no entry hole in the snow, just the metal chips/dust.
Loved the .22-250, but if you don't handload, get a .223.
JP