I used the UMC and swapped to Win white box a while back. I'm switching back to UMC. It shoots much better groups out of my 9 sub than white box. I buy 50 round boxes of UMC for $6 ($30 for 250 rounds) in 9mm.
I have put about 2000rds of UMC mega packs through my two XD-40. Its probably one of the more accurate ammo I have tried, short of some real expensive stuff like Golden Sabre and I have never had any major malfunctions while using it.
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