I think the 1:11 twist should stabilize 180 gr bullets generally, but it depends more on the length and you didn't mention which bullets you're shooting. Are they monolithics? If yes, they're longer and stability might be an issue, but I still doubt it. The 150 gr you're about to try next will tell you if stability is the issue, or you can run a calculation with an online calculator like JBM.
I'm guessing the comments about consistent hold and not letting the barrel get too hot are instead closer to the mark (assuming you tightened the action screws properly).
Hope you get it firmed up before the hunt.
JBM - Calculations - Stability
www.jbmballistics.com
I'm guessing the comments about consistent hold and not letting the barrel get too hot are instead closer to the mark (assuming you tightened the action screws properly).
Hope you get it firmed up before the hunt.