In my experience, I've shot a few different flavors of .45's, and most all of them I can group into a tight cluster at 30 feet. With my G21, I can hit a shotgun shell at 30 feet more often than not. With a Sig P220, I can shoot out the eye socket of silhouette target at 30 feet. With a 1911, I'm right there, too. I've never shot a .45 I didn't like. But among the 9mm's I've shot, I've been horrible with 2 different P228's. I'm pretty decent with a Beretta 92FS, but not lights out accurate. And I'm halfway decent with the G19, after putting thousands of rounds through it. But it still isn't a .45. I recently starting reloading. And I noticed that my Glock 9mm's throat is a lot longer than my other 9mm. So I've been loading my Glock reloads to the maximum length they will chamber. My first couple batches were super light, and accuracy was about on par with my experiences with factory loads. Then I recently worked up a small test batch of full power loads. I took aim at a white target with a 1 1/2" black bulls eye at 30 feet. I didn't see any impacts. Excited, I pulled in the target, and all shots were in the black. This is the best group I ever shot with this gun. The rest of the test batch (one magful) continued this "trend." So I'm starting to wonder if there's any truth to this. Are 9mm's ammo sensitive? Or am I deluded to think that ammo makes any significant difference in accuracy at such short distances?