Steel cased 9 mm question

Only issue i've ever had was with teh winchester forged steel case 9mm and the 31 round ETS mags. For some reason whatever those rounds are coated with, it jams them up in the mag. In a regular glock mag they feed fine. And the ETS mags feed other steel ammo too so it's just the winchester forged brand and ETS mag combo that is a problem for me.
Love ETS mags..
 
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