I've been picking up 4831 when I can find it....Walmart, Blacksheep, White Elephant or where ever. I now have five 1lb. containers......all seals are intact......unopened. I put some new shelves in the shop and as I moved powder to the new shelf, I thought I noticed a difference in the weight of the 4831 containers. I got out the postal scale and weighed all five containers of 4831. Only one weighed 1lb 2.2oz. The other four were between 13.3 and 14.4 ounces. I double checked to make sure the seals were intact........they are. I also checked some 4064, 4350, H110 and they all weighed 1lb. 2.2 oz. It just seems to be the IMR 4831. Has anybody else checked their powder to see if you are getting a full pound? The new plastic jug should weigh 1lb. 2.2oz. when it has a pound of powder in it. I know I've been had...........wonder how many others?