My 338 win mag with a boss has a pencil barrel it's crazy way too thin for a 338 win mag .It has the cheap plastic stock but with the boss I shot a bunch of 1 inch and a few 3/4 inch groups at 200 yards with factory ammo and I didnt adjust the boss .That rifle needs a laminated stock it's 6.5 pounds empty way too light for 338 win mag .It weighed almost the same as the same rifle in 243 win .Mine is a control feed but that rifle was a total mess the scope screws were drilled crooked.I had to replace the whole magazine assembly and trigger guard it refused to work that .The so called stainless finish flaked off and the rifle rusted .That rifle was a accurate piece of crap I like ruger stainless 338 model 77 way better and it was even more accurate. IT was a famous Skelton stocked ruger 77 and kicked like a mule I couldn't shoot it and I changed it to a Boyd's laminated stock and it shot perfect super accurate 5/8 -inch at 200 yards with factory ammo super good that was with just a 3x9 Japanese Nikon scope .That Winchester model 70 turned me off to new Winchester and the control feed was picky with it .