CharlieDontSurf

I had the same questions and botched up trying to start a thread about it, anyway I contacted Hornady and received the following response: Hornady Support commented at: 10-28-2020 01:11 Mr. Urquhart, thank you for contacting us. This bullet is suitable for use in the 9mm, while we cannot disclose specifics regarding how it came about, load development can begin by using starting charges listed for the 9mm and our 124gr bullets. Thanks j commented at: 10-23-2020 11:04 Hello,I recently purchased a large amount of .354 HAP bullets with cannelure (125 grain) thinking I was purchasing the .356 HAP bullet for reloading 9mm. My primary question is whether the .354 HAP suitable for 9mm? Also, what caliber was it designed for being that it is .001 smaller than the typical .355 and it having a cannelure? I didn't see this bullet in the Hornady Reloading App so if you can provide load data, either specific to this bullet or confirm that load data for another bullet that would translate to this bullet, I would also appreciate it. Thank you.

Sorry for the multiple posts. When I clicked post, I got error messages and I kept trying.

I thought I was buying HAP .356 bullets for 9mm and 125 gr .354 HAP bullets with a cannelure showed up. My fault, I ordered what I thought I was looking at from the previous day. I loaded up a few dummy rounds with it, which I couldn't really tell a difference between a .355 in the way it sat atop the belled case mouth and it seemed to load well. The case ended up at .377 which is the same as my .355s. So, is there anything inherently wrong with loading 9mm with this bullet? Will the cannelure or smaller diameter give my any unintended consequences? Should I take precautions regarding the powder load? I was intending to use 4.2 of Titegroup. Your comments are appreciated.

I thought I was buying HAP .356 bullets for 9mm and 125 gr .354 HAP bullets with a cannelure showed up. My fault, I ordered what I thought I was looking at from the previous day. I loaded up a few dummy rounds with it, which I couldn't really tell a difference between a .355 in the way it sat atop the belled case mouth and it seemed to load well. The case ended up at .377 which is the same as my .355s. So, is there anything inherently wrong with loading 9mm with this bullet? Will the cannelure or smaller diameter give my any unintended consequences? Should I take precautions regarding the powder load? I was intending to use 4.2 of Titegroup. Your comments are appreciated.

I thought I was buying HAP .356 bullets for 9mm and 125 gr .354 HAP bullets with a cannelure showed up. My fault, I ordered what I thought I was looking at from the previous day. I loaded up a few dummy rounds with it, which I couldn't really tell a difference between a .355 in the way it sat atop the belled case mouth and it seemed to load well. The case ended up at .377 which is the same as my .355s. So, is there anything inherently wrong with loading 9mm with this bullet? Will the cannelure or smaller diameter give my any unintended consequences? Should I take precautions regarding the powder load? I was intending to use 4.2 of Titegroup. Your comments are appreciated.

I thought I was buying HAP .356 bullets for 9mm and 125 gr .354 HAP bullets with a cannelure showed up. My fault, I ordered what I thought I was looking at from the previous day. I loaded up a few dummy rounds with it, which I couldn't really tell a difference between a .355 in the way it sat atop the belled case mouth and it seemed to load well. The case ended up at .377 which is the same as my .355s. So, is there anything inherently wrong with loading 9mm with this bullet? Will the cannelure or smaller diameter give my any unintended consequences? Should I take precautions regarding the powder load? I was intending to use 4.2 of Titegroup. Your comments are appreciated.

I thought I was buying HAP .356 bullets for 9mm and 125 gr .354 HAP bullets with a cannelure showed up. My fault, I ordered what I thought I was looking at from the previous day. I loaded up a few dummy rounds with it, which I couldn't really tell a difference between a .355 in the way it sat atop the belled case mouth and it seemed to load well. The case ended up at .377 which is the same as my .355s. So, is there anything inherently wrong with loading 9mm with this bullet? Will the cannelure or smaller diameter give my any unintended consequences? Should I take precautions regarding the powder load? I was intending to use 4.2 of Titegroup. Your comments are appreciated.