Rifle appears to be built on a lefty Winchester M-70 blued action or a Montana lefty, either way nice rifle build.
Your "Brown and Down" Bob this year. Congrat's again.
Doc
Montana Action, Montana Barrel and HS Precision Stock . Leupold 3.5 x 10, By the way that is the exit hole i was shooting down hill. Accubonds are rough when you push them fast