I'm wondering if others have had problems with this combination. I've got a fairly new DW Guardian in 45. It went through 500 flawless rounds of hardball using both the factory and a couple of Wilson ETM mags. As soon as I switched to my preferred carry ammo (Federal HST std pressure) I started getting frequent failures to feed (the nose of the cartridge would jam on the feed ramp). So I sent it back to DW who polished, throated, and cleaned up the trigger. Excellent work and promptly done. I put about 80 rounds of HST through the Guardian today. The factory mags worked great. But the Wilson mags jammed at a rate of about 1 round / magazine. It still feeds hardball flawlessly. I guess the easy answer is just use the factory mags. I'd also consider an alternative ammo choice as long as it's reliable, has a good track record, and expands well (nothing gimmicky please). I'd be interested to hear the thoughts from the pros here.