I have a chance to go spring bear hunting in Canada. Need help on rifle selection; caliber? optics? manufacture recommendations? Hunting will be from a ground blind. According to guide, shots will be in the 50 to 75 yard range. I have a 20 year old winchester model 70 in 30 06 with Leupold scope. It has the adjustable weight on the muzzle that was supposed to help accuracy but I disliked it so much at the range, I've never used it for actual hunting. Thoughts?