Max It Posted September 10, 2018 Share Posted September 10, 2018 HI, I think my last batch of .357 magnum bullets were made with my 9mm 124gn .356 projectiles. I didnt notice the diff. how about you? or should i use .357 projectiles in both? Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted September 10, 2018 Share Posted September 10, 2018 Not sure I understand ... But, if you loaded some .357 ammo using .356 bullets, I'd imagine you could get lower velocity and possibly less accuracy than usual. Link to comment Share on other sites More sharing options...
Max It Posted September 10, 2018 Author Share Posted September 10, 2018 Jack, yes. I loaded some .357 mag bullets using .356 projectiles. at the same time i realized that my Blackhawk Convertible comes with two cylinders; one .357 and one .356 (9mm). I haven't seen any variance in groupings between shooting the two. I used to think the .357's were more accurante out of the Blackhawk however the groups don't show that. Link to comment Share on other sites More sharing options...
jpm2953 Posted September 11, 2018 Share Posted September 11, 2018 I have used them interchangeably. Have seen better accuracy with .357 in some 9mm Guns. Link to comment Share on other sites More sharing options...
Dwbsig Posted September 11, 2018 Share Posted September 11, 2018 22 minutes ago, jpm2953 said: I have used them interchangeably. Have seen better accuracy with .357 in some 9mm Guns. I'm finding the same thing in some of my 9's . Link to comment Share on other sites More sharing options...
jkrispies Posted September 11, 2018 Share Posted September 11, 2018 I recall this topic coming up many years ago in a reloading forum I used to frequent. The consensus amongst the more learned reloaders was that different barrel manufacturers have different bore tolerances. By that token, if you’ve got a loosely bored 9mm, it may very well shoot .357’s better than .355 or .356. Conversely, if your 9mm has a tight bore... .357’s may not be the best idea and can result in an over pressure situation. If it’s really something you want to explore, it would be wise to slug your barrel first to accurately mic your actual bore diameter before experimenting with oversized projectiles. I’d imagine that going with a slightly undersized projectile (ie, a .355 in a .357 barrel) wouldn’t have much of an effect, at least as far as safety goes. Link to comment Share on other sites More sharing options...
Max It Posted September 11, 2018 Author Share Posted September 11, 2018 hi J, you know what; i better stick to two diff diameters. as i have several different 9mm and a couple of .357's so i can't differentiate. much obliged, Link to comment Share on other sites More sharing options...
noylj Posted September 11, 2018 Share Posted September 11, 2018 (edited) I use 0.356-0.358" lead bullets and 0.356-0.357" jacketed in all my 9x19s. The SAAMI barrel and bullet dimensions for 9x19 and .357 Mag are the same. Also, the larger bullets are often more accurate. During the last 9mm bullet shortage, it was so easy going on-line and buying .38 bullets... Edited September 11, 2018 by noylj Link to comment Share on other sites More sharing options...
Jakobi Posted October 9, 2018 Share Posted October 9, 2018 You probably won't notice a difference if using jacketed or plated bullets (I do this with a 38 S&W and .357 bullets). Shoot undersized lead and long term you might see excessive leading due to a poor seal. Link to comment Share on other sites More sharing options...
Max It Posted October 10, 2018 Author Share Posted October 10, 2018 Jako, appreciated. I generally use 124gn Moly projectiles. But I will consider your response. Much obliged, Max Link to comment Share on other sites More sharing options...
Max It Posted October 10, 2018 Author Share Posted October 10, 2018 (edited) On 9/10/2018 at 9:56 PM, jkrispies said: I recall this topic coming up many years ago in a reloading forum I used to frequent. The consensus amongst the more learned reloaders was that different barrel manufacturers have different bore tolerances. By that token, if you’ve got a loosely bored 9mm, it may very well shoot .357’s better than .355 or .356. Conversely, if your 9mm has a tight bore... .357’s may not be the best idea and can result in an over pressure situation. If it’s really something you want to explore, it would be wise to slug your barrel first to accurately mic your actual bore diameter before experimenting with oversized projectiles. I’d imagine that going with a slightly undersized projectile (ie, a .355 in a .357 barrel) wouldn’t have much of an effect, at least as far as safety goes. Makes me smile: years ago, maybe at your recommendation I slugged one or two of my 9mm's and found them to be .3555". I don't remember which ones now. Point is i have several and want to simplify things. I shoot 100 x9mm for every 6 x .38's. so for me to have to stock two different ones and reset the press is a pain. Current supplier of 124 gn Truncated Cone Moly's are .3565". It seems just right both sizes to me, any opinions? as always Much obliged, Max Edited October 10, 2018 by Max It Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now