Likely started with a hunting buddy freezing up his pump action - could not get it open when he got back to the truck. Some minutes of warming and it cycled fine. Is my impression that can not happen with bolt action - can smack the bolt and get it open - although a neighbour's Rem 788 broke off the bolt handle from the bolt body by doing that. That sort of morphed in my thinking that bolt action was more dependable, in cold. So likely became a "personal preference" to stay with bolt actions - typically I understand them and have experienced most all the ways they can fail - and how to get them back running, again. I am just not familiar enough with how semi-auto work inside. My preference is for bolt actions that I can dismantle the bolt to firing pin spring and firing pin without using tools - just fingers - so, sort of "old fashioned" that way - I use mostly Mausers of various ages, and Win Model 70 with three position safety. P-14 and M1917 Enfields are similar. Is no doubt that there are semi-auto designs that allow same to be done - I just do not know how.