I own a Sig P-229 and have both the .40 and .357 barrels for it. As I was cleaning my Sig today I got to wondering which of the two calibers that others who own pistols which can readily swap back and forth prefer more? I enjoy shooting both calibers out of my Sig during range trips, but when it comes to personal protection, my choice is Winchester Supreme Elite PDX-1 ammunition in .40SW.