I have used mine for 2 years and it works great on bottle neck cases I have not used it for pistol (straight wall) cases. It has improved accuracy for me.
My brother is a retired Seal Master Chief and noted that they train with 686's (66's in the past) as well as semi autos and they can choose both but most go for semi autos because of capacity fire power dosent count for much in close quarters (1 in the head 1 in the chest) with hours and...