Swift held it back mainly in that very few hunted varmints until the '60s, even in to the 80s. Friends considered me "nuts" when I started 40+ yrs ago, lately they've wanted to be shown how. The unbelievable take off of varminting over the past 10 - 20yrs has led to many improvements in all types equipment and it should continue for awhile. So many calibers, so little time
First it rained, then it blew, then it frizz, then it snew --- from an oldtimers gunning boat ~~ He understood what it's about!