Mossberg ATR .243 light primer strike

[hboy35]

I have run a box of Federal, a box of Remington, and one box of Winchester through this rifle. Today at the range, I fired about 20rds of Hornady through it, and had 2 light primer strikes. I did not attempt to try these rounds a second time. I even fired a few Monarch brand with no issues today.

Anyone else have this problem? Is there anything I can do before taking it to a shop to have it worked on?
thanks