OP do you already have the Jard trigger? Setup is everything, with it.
I had a 2lb Jard in my .308 AR - it's in another rifle now, only because I got the .308 SR Gold for the .308. On a few occasions, when others shoot my .308, they would double it. It came directly from trigger follow-through (or lack of follow-through). It's such a short reset, that if you don't have proper follow-through (and weak-finger it), you'll allow it to reset immediately. The reaction to recoil (rifle coming back forward), and the imperceptible trigger finger position (let off trigger pressure, but trigger finger almost in the firing position) will bump the trigger again. Boom #2.
WIth proper trigger follow-through, this is never, never a problem. I briefed everybody since that shot that rifle with that trigger, prior to them shooting it (once I saw what was happening).