This is just to let people know which head stamps of brass could give you problems while reloading. Please feel free to add your own if you've found any. Please list caliber, head stamp, and what the issue is. The following are all 9mm brass cases. WIN head stamp - I've been coming across some cases lately that have a ridge about .180" - .190" below the case mouth. I assume this is to prevent bullet set-back. If your bullets are set more than .180" into the case this could give you an unwanted bulge. WMA head stamp - Same type of ridge but doesn't seem as pronounced. Tulammo - a lot of flash holes are off center, a lot. Have seen some that are against the side of the primer pocket. This can be a problem if the cases need to be trimmed. Ammoload and IMT - These have a large ridge inside the case that reduces the case volume. This can be a big problem if you are putting together hot loads and these cases are mixed in with your brass. I've heard a lot of these are coming from Freedom Munitions. Have heard there are .45acp from Ammoload with the same feature. This is what the Ammoload stuff looks like. That's all I've got for tonight. Will post more when I find them. Post up what you've found. Thanks.