hey guys i got a new mcrees chassis on my sendero. this is the second time out with it and i am having alot of problem with my trusted drop chart from the factory h&s precision. i zeroed it and it is shooting right at a half minutes at 100. when i stretch it out is when i get in trouble. my old drop chart was 7 moa at 500. i went out the first time with the chassis and had it seemingly dialed in that day at 6.5moa at 500. tonight we went out and i dialed 6.5 and i was high, came down a half, high again, long story short it settled in at 5moa. load is winchester brass 162gr amax cci 250 primer and 70.5gr retumbo. is this a rear bag problem? it seems that i have a hard time settling in with the new chassis and the small area in the rear for the bag. any advice would be great thanks!