Hey guys, I've got a problem. I believe I am seeing signs of overpressure from some factory new ammo I bought yesterday. I was planning to shoot, then reload it, but now I'm a little leery to even shoot the stuff. Problem is, I am COMPLETELY new to 10mm (those were my first 10s to shoot), so these things that I am interpreting as "signs of overpressure" may be totally normal and characteristic of this awesome caliber. Just for some background on me, I have shot many guns (rifles, pistols, shotguns) in my past, but just bought my first pistol about two years ago (G21SF). I wanted to start reloading, and upon telling my awesome neighbor about my desire to roll my own, he promptly let me "borrow for an indefinite length of time" his Dillon 550B. So, I quickly jumped headfirst into reloading. I have been reloading .45ACP for about 6 months now, and have made over a thousand rounds, but I'm still somewhat of a novice. Yesterday, I bought my first 10mm (a Glock 29, awesome gun), and bought the following ammo: Cor-Bon Pow'rball 135 gr.; Cor-Bon 180gr BCSP (this is a pretty hot load for a Cor-Bon. 1300fps and 676fpe, I wish they had more than one box), and finally, 3 boxes of American Eagle 180gr FMJ. I had planned to carry the Pow'rball, shoot the Cor-Bon 180s for fun, and shoot and reload the American Eagles. Well, after shooting the first magazine of AE, I began picking up my brass, and noticed quite a large bulge on one side of the casings near the pressure ring. Then, looking at the primers (and comparing them to unfired primers), they seemed decidedly flattened. I will post pics. Anyway, my question is: Are these apparent "signs" normal to the 10mm, or at least 10mm out of a Glock 29? I would not have been surprised to see such signs in a hot loading (like the C-Bs, which were similarly bulged), but I guess what threw me for a loop was the fact that these were 1030fps (rated) target ammo. I was just shocked to see the bulge. Maybe this is totally normal for even soft 10mms, but since I am really only familiar with the low pressure .45ACP, I don't know. When I fire .45s the primers look exactly like they did before they went into the gun, except now they have a strike, and there is no bulge that can be seen. The 10mm primers are quite flattened compared to the rounded edges of the new primers. So, should I reload this brass, or is it crap? I was guessing (if there even is a problem) that it is weak brass. Recoil was not excessive, and quite a bit milder than the Cor-Bons. Anyway, you guys get the point by now, so I'll quit rambling. By the way, the gun is brand new, and totally stock. These were the first rounds through it. Below will be measurements and pics of the fired brass. Let me know what y'all think, and thanks in advance for the help! American Eagle 180gr FMJ, MV=1030fps (rated), Federal (F C) headstamp: Unfired dia. @ pressure ring=.420" Fired dia. @ pressure ring=.4335" Fired dia. @ case mouth=.426" Fired brass thickness=.011" Cor-Bon 180gr BCSP, MV=1300fps (rated), Remington (R-P) headstamp: Unfired dia. @ P.R.=.420" Fired dia. @ P.R.=.4345" Fired dia. @ case mouth=.426" Fired brass thickness=.0115-.012" The first three pics should be of the American Eagles, the last three, Cor-Bon.