Here is a drawing depicting the layout of thick and thin sided cases, like my 585/375/416 HE thin sided ones and the thick one in picture. And my 585 case is not perfect, as where it transitions from the heavier corner to the side it isn't gradual, so case separates there shortening case life. There are others made that way including brand X. The dotted line is what it should be............ Others have sent cases to section and look at, that are built thick sided and they stick also for the folks, If a longer case with about 5 sq in of side surface sticks and don't spring back, the coefficient of friction is about .01 then the pull needed to move it is 2500-3500 lbs..That is for big cases with normal amount of slant to the sides. Here is picture of six nyati and gibbs size cases sectioned.. the5th one is present 585 HE and 6th is thick sided version. 1st 600 OK which essentially nyati basic case left straight, belt added In the picture the nyati gma is one we built most of our first 585s on. Before we had factory run. Reworking made it in size that is my 585 HE, but that brass had the sides of perfect thickness, not too thick, but thin without sharp transition my new factory 585s had, they last forever as 585s...... Fourth one is an older nyati case I used to make about 10 of my 585s from,had thin sides, heavy corner and sharp transition from the corner, tested 20 years ago, and they would separate after 4-6 hot loads as 585s, my factory 585 with right powders, as a 585 will get 10 hot loads, and necked down to 416/375 4- 6 hot loads, right powders used, Moderate 577 equivalent, factory 585 at least 20 loads..Ed.