I've had a couple. A dash 2 and a dash 3.. Neither ever became loose. I shot the -3 so much that I avoid heavy loads in it now. Mostly for me and not so much for the gun.
I doubt anything shot with it will show a difference from a load that's full throttle compared to one that's more conservative. The cartridge in my experience is so good, I have taken for granted, never once doubting it's capability.
