The Firing Line Forums - View Single Post - 9mm 125 gn. hard cast bullet seating depth and load data

dunerjeff · March 3, 2012, 09:18 PM

I use some of those same lead bullets.The first one I believe is concidered a type of bore rider(the front part just slides down the bore)and the back half does the sealing and grabing of the rifling,it is done to aid accuracy, I think.The second is a standard RN,and is shorter. Usually the manuals will list coal for the second or "standard" RN so you can figure you will have to reduce charges a bit from published charges due to the deeper seating of the longer bullet.

Scimma= by 4.7" barrel I assme your talking Beretta? If so, do your barrels slug at .357 like mine? I have to use .38 bullets or the few 9mm's that are sized to .358 to end my leading and tighten up groups.

March 3, 2012, 09:18 PM	#7
dunerjeff Senior Member Join Date: March 31, 2011 Location: central Wisconsin Posts: 440	I use some of those same lead bullets.The first one I believe is concidered a type of bore rider(the front part just slides down the bore)and the back half does the sealing and grabing of the rifling,it is done to aid accuracy, I think.The second is a standard RN,and is shorter. Usually the manuals will list coal for the second or "standard" RN so you can figure you will have to reduce charges a bit from published charges due to the deeper seating of the longer bullet. Scimma= by 4.7" barrel I assme your talking Beretta? If so, do your barrels slug at .357 like mine? I have to use .38 bullets or the few 9mm's that are sized to .358 to end my leading and tighten up groups. __________________ sent via telegram