My adult son Mike was shooting my S&W M&P last Sunday at the local indoor range introducing a friend to handgun shooting. He had taken his carry pistol, a Star PD and the Smith to give Micah a chance to shoot both revolver and auto. He stopped by Academy for some ammo, "CCI Blazer 45 ACP" for the Star and "Monarch 38 Special jacketed flat nose" (PPU brass case) for the M&P. They shot all of one 38 box and most of the 45 ACP ammo and Mike said one more cylinder in the Smith and we need to go. When Micah (the new shooter) was firing his last 6 rounds in the Smith he commented that the recoil felt light and his shot wasn't even "on the paper". Mike looking at the revolver figured it was just the contrast to shooting the Star 45 that they had just fired, it can be a handful with hardball ammo. Micah finished the cylinder and gave it to my son who reloaded it with no indications of a problem and fired one shot. He thought it really felt strange so he brought the pistol down to check it and noticed the barrel was split on both sides and the spent bullets jammed in the barrel were exposed on the right side. In his words he "nearly soiled himself". When I inspected the brass later I found one with no powder residue and several with pressure signs on the primer (imagine that). I'll send the pistol to Smith & Wesson for repair. Mike tried to give Academy a heads up about this ammo failure by talking to the store manager, but he was indifferent. I don't know if Monarch is loaded by Prvi Partisan or is just their brass. My experience with all Prvi loaded ammo has been very good. So...if you shoot "Monarch" ammo be alert for misfire etc., if this had been 357 or even 38+P I think the results wouldv'e been immediate and very violent! I have pics on Photobucket for anyone interested.