best diameter for 9 mm. 125 gr. r.n.

pete5409 · July 7, 2009, 01:42 PM

I´m going to start reloading for a Hi Power 9 mm; what sizing diameter should work the best? .355 , .356 or .357?

**Unclenick** · July 7, 2009, 01:49 PM

0.355" for jacketed and 0.356" for cast or other lead projectiles is standard. The .357" jacketed bullets are for .38 Special, .357 Magnum and related rounds.

pete5409 · July 7, 2009, 01:54 PM

Thank you for your prompt response. I´ll size and reload a few to .356 and see how well they feed and group.

Randy 1911 · July 7, 2009, 09:07 PM

I bought a Browning Hi-Power brand new and the accuracy was terrible. I had my gunsmith slug the bore for me and it measured .357". You might want to slug your bore first to see what size your bore is. I just replaced the barrel with a aftermarket barrel and got great results. The gunshop where I bought it wouldn't let me return it because it had been fired.

publius · July 7, 2009, 09:50 PM

That .357 barrel might be fun to play around with.

July 7, 2009, 01:42 PM	#1
pete5409 Member Join Date: March 26, 2008 Location: Mexico Posts: 37	best diameter for 9 mm. 125 gr. r.n. I´m going to start reloading for a Hi Power 9 mm; what sizing diameter should work the best? .355 , .356 or .357?

July 7, 2009, 01:49 PM	#2
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,060	0.355" for jacketed and 0.356" for cast or other lead projectiles is standard. The .357" jacketed bullets are for .38 Special, .357 Magnum and related rounds. __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle

July 7, 2009, 09:07 PM	#4
Randy 1911 Senior Member Join Date: May 7, 2009 Location: Western Arkansas Posts: 273	I bought a Browning Hi-Power brand new and the accuracy was terrible. I had my gunsmith slug the bore for me and it measured .357". You might want to slug your bore first to see what size your bore is. I just replaced the barrel with a aftermarket barrel and got great results. The gunshop where I bought it wouldn't let me return it because it had been fired. __________________ Been Reloading 27 Years NRA Member Member Old Fort Gun Club www.ofgc.org

July 7, 2009, 09:50 PM	#5
publius Senior Member Join Date: January 25, 2005 Location: Mississippi/Texas Posts: 2,505	That .357 barrel might be fun to play around with. __________________ "Suppose you were an idiot, and suppose you were a member of Congress, but I repeat myself." Mark Twain

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July 7, 2009, 01:54 PM	#3
pete5409 Member Join Date: March 26, 2008 Location: Mexico Posts: 37	Thank you for your prompt response. I´ll size and reload a few to .356 and see how well they feed and group.