I'm having some accuracy issues. I can normally shoot the Sierra Match Kings well under 1", but I put an adjustable gas block on and then started to shoot the tipped ammo and the bullets are all over the place. I only had 3 non tipped MKs and they shot .75" or better. Then I shot some 55 grain bulk ammo that were lead tipped boat tails and were easily shooting .5-.75 moa.! Has anyone else had this experience where the original BTHP MKs shot better than tipped?