I carry a 20sf also quite frequently, and I love the performance of the 10mm. With 180 grain Hornady XTP's, it will drive nails at 25 yards. My wife and I go hiking at Smoky Mountain National Forest a couple of times per year, and I find this to be a well-suited sidearm for black bears (carrying a long gun in Tennessee is illegal). I did find however, that the Glock polygonal rifling is not suited for ultra-heavy 230 grain bullets. It shoots about a 24" group at 15 yards, and the holes in the paper show clear evidence of bullet tumbling. I suggest a 6" Lone Wolf barrel if you intend on doing any hunting or carrying heavy rounds. And although 50 round boxes of 10mm are crazy expensive just about anywhere you go, Georgia Arms sells a 500 round bulk ammo can of 180 grain standard pressure loads for $205. Hope that helps.