Temp9, I'm shooting a 308. I find it difficult to keep my shoulders square to the target. My right shoulder is canted back similar to shooting off hand.
Jim
I loosened mt rings and closed my eyes, got on to the rifle and opened. Did this until I had the perfect picture. Then re torqued. Also you don't want to be lifting your head or coking it.
My rifle came with a Timney set a 2.5 lbs. I reset it to 1.5. No problem with slam fire. Suggest you use finger nail polish or lock tight to keep it constant.