I just recieved my PACNOR barrel. It is 40 inches long and 1.7 inches in dia. One question I've had is that the Nesika action I want has 1/16 - 18 TPI which seems to be a bit on the small side when compared to the diameter of the barrel. I am wondering if it shouldnt be more proportional to the dia of the barrel. Should I use a combination of a barrel/action block and clamp both items within this block? This would ease my mind about the thread dia issue and support the area where the most stress is going to occur. I would like to compete one day at Willamsport but do not have the regulations for what class I would be in. The barrel weighs in at 26 pounds the action is another 60.0 oz (3.75 lbs), the scope base and rings will sit a top of the barrel/action block and will add appx. 3 lbs to the weight, stock will be about another 8 to 10 pounds with all of the adjustments ie. LOP, and 3-way butt plate. The total weight with scope will be inbetween 40 to 45 pounds. What class will that put me in? The scope will be a U.S. Optics SN-3 MkIV 3.8-22X with a 40 mm tube and 80 mm obj the MkIII is the only one they list a weigh of and it's 21.0 oz's. Let me know your thoughts on using a barrel/action clamp block for both items.