different col in 9mm

MDS · January 22, 2011, 11:58 PM

I have benn running some 124gr 9mm FMJ A set col of 1.124 They are running 1.124 to 1.130. I've never had this problem and have never had to trim pistol brass. Most are seating to propper col.

rg1 · January 23, 2011, 01:43 AM

I've seen several different brands of 124 FMJ 9MM bullets that varied in length a few thousandths. Some bullets in the lot will have a blunter rounded tip while some may have a longer sharper pointed tip which will make a difference in seated overall length. Never seen a problem with feeding or accuracy with a slight difference in overall length. Your seating stem which touches the bullet on the side of the nose rather than the tip will give a little difference. I seat 124 FMJ's to about 1.150" and they feed fine in 3 pistols and one carbine 9MM. Your .006 thousandths difference is nothing to worry about as long as they feed reliably.

MDS · January 23, 2011, 09:59 AM

Thank you. I was concerned about it affecting prrssures.

January 22, 2011, 11:58 PM	#1
MDS Senior Member Join Date: September 9, 2005 Location: Ohio Posts: 492	different col in 9mm I have benn running some 124gr 9mm FMJ A set col of 1.124 They are running 1.124 to 1.130. I've never had this problem and have never had to trim pistol brass. Most are seating to propper col.

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January 23, 2011, 01:43 AM	#2
rg1 Senior Member Join Date: November 6, 2001 Posts: 1,125	I've seen several different brands of 124 FMJ 9MM bullets that varied in length a few thousandths. Some bullets in the lot will have a blunter rounded tip while some may have a longer sharper pointed tip which will make a difference in seated overall length. Never seen a problem with feeding or accuracy with a slight difference in overall length. Your seating stem which touches the bullet on the side of the nose rather than the tip will give a little difference. I seat 124 FMJ's to about 1.150" and they feed fine in 3 pistols and one carbine 9MM. Your .006 thousandths difference is nothing to worry about as long as they feed reliably.

January 23, 2011, 09:59 AM	#3
MDS Senior Member Join Date: September 9, 2005 Location: Ohio Posts: 492	Thank you. I was concerned about it affecting prrssures.