I have an A-Bolt Titanium .308 I picked up a few months ago that shoots ok but not great. I know its light and the barrel is thin but are there any tricks to getting better groups out of it? I installed the 3# trigger spring and have a quality Weaver scope on it. I've tried Rem Corelokts and Winchester Powerpoints in it and the best I can get is about 2-2.5" at 100. Any help or experience?