I am sorry for the problems you experienced. Even though you did not request a refund, I would be glad to replace the ammo for you. We stand behind all out products and are trying our best to produce a quality product. Please let me assure you that the demand for the product has not changed our QC requirements. Bullet set back on both 40 s&w as well as 357 sig and a few others is a normal issue that we work on every day. What has made the issue show up more often is the struggle for components which forces us to use a wide assortment of bullets and or brass and the dimensional disparity between the two. We have to under size the case to hold the bullet in place, the crimp alone will not do it. The 40 S&W case headspaces on the case mouth so we cannot roll crimp that case as you would a 38 or 44. A taper crimp of about .002 inch is all that is allowed. The problem is how much the cases vary in thickness and the bullets in exact diameter and taper. If we size all the cases well under size to hold the bullets, as I would like to, the thicker of the cases will create a bulge at the base of the bullet that will not allow the round to chamber. We are using a sizing die on the outside of the case to set the diameter on the inside, which forces us to walk a fine line between sizing the thin cases enough to hold the bullets but not so much that the thick cases are bulging. Most of the time we do this pretty well, but sometimes we will have a few thin wall cases sneak in with the rest that get by us. The good news is that we have done extensive research on bullet set back and how it effects pressure and I can assure you that the rumors of polymer framed pistols being destroyed by bullet set back are just that, rumors. We have sent to Hodgdon Powder Company for testing, all types of auto pistol rounds such as 9MM, 40 S&W, 10MM, 45ACP, 357 Sig etc. for pressure testing. Without getting too detailed as the story gets too long, we tested the rounds, as loaded, for pressure compliance with SAAMI specs. Once we had determined the pressure of the round loaded to the desired length, we pushed the bullet back until it was resting on the powder charge. What we found was that the pressures DID go up, but not to a level that would create any problems in a proper pressure vessel ( the term used by metalurgists for a rifle or pistol barrel). For example, the 40 S&W operates at 35,000 PSI maximum average. Our standard FMJ rounds are normally around 31,500 PSI. When we tested these rounds pushed back to the bullet, the pressure went up to 38,000 PSI which is over the average allowed but not over an individual pressure allowed. Nor is it over the proof pressure that all 40 S&W barrels SHOULD be tested to which is 47,000 PSI. What you will find is that all manufacturers do NOT proof test their barrels and some of these have a problem from time to time and it is blamed on other issues but we have not found this to be the case, the barrel is the problem. Please don't misunderstand my point, I am not advocating allowing set back bullets to go unnoticed, I am simply saying that while they are undesirable, they are not dangerous to the gun or shooter as has been represented by some in the industry. In any case, please let me know how we may proceed to solve this problem to your satisfaction. Thanks.