Over on AR15Armory.Com there is a sticky warning against using Remington-UMC in ARs. It does not give the reason why but from other threads I have gathered that it doesn't properly work the action and may cause extraction/ejection problems. I've used a little of it myself and had no problems. I tend to buy Federal or PMC. The main objection to Wolf ammo is that it is dirty for reasons mentioned above.
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