9mm 125gr question

[firstg19]

Is 9mm 124gr and 125gr Lead Round Nose Data interchangeable? Also, is 125gr LRN and 125gr lead conical nose interchangeable? Do i need to adjust lengths or anything? Are the lengths of the bullets the same? I am having a hardtime finding good data for 125gr lrn.

Feel free to suggest loadings that have worked for you and please include the OAL.

Also, I have attached a picture of the bullet i am using. Length wise, the bullets measure anywhere from .602 - .606.

 

[Quoheleth]

Yeah, 124 vs 125 gr lead bullets use same data. You'll get +/- 1 to 2 grains differentiation, frequently, with cast bullets anyway. Same for bullet design in a weight class (i.e. 125 gr LRN vs 125 gr LTC). What powders are you looking at? I like Universal and Titegroup in mine. For data, check the powder manufacturer's websites. You should have at least one published manual, too.

OAL can vary with gun. My M&P took rounds that were a little longer; my CZ85 needed bullets .01-.015shorter. You'll have to experiment with OAL to make sure they fit.

Q

 

[firstg19]

what does LTC stand for...did you mean LCN - lead conical nose? also, what I am worried about with using the LCN, an LRN is that i am not sure if the bullets are the same lengths and have read in the speer manual that varying oals on a small case like the 9mm can greatly increase pressure. How do you tell how long the oal should be..ive noticed some places do not list OAL and expect you to come up with this some how. Is there a standard way to do decide on what is safe? I did notice that the 125gr rn has a little bit of a lip on it, would u seat to line up with the lip?

 

[Quoheleth]

LTC: Lead Truncated Cone

 

[firstg19]

so then you are setting the LTC or LCN to the same OAL's as LRN?...i guess if the answer is yes, then all i need to do is use the Hodgdons 125gr LCN data for my LRN

 

[evan price]

You need to make sure the same amount of lead is in the case before you use the same data. A LTC vs a LRN may have more lead in the case depending on where the driving band stops. It is possible both bullets may have different OALs but the same amount of lead base in the case (same internal case volume) and THEN they can use the same data safely.

That said, 95% of commercial moulds drop nearly the same boolit and they are usually going to be OK.

 

[Slamfire]

I don't know about "good" data, but this is my data.

I was developing loads that provided excellent accuracy and always functioned the pistol. Or maybe to say, functioned the pistol with 100% reliability and had the least recoil.

I settled on 4.0 grains Bullseye.

I totally agree with the statement that lead bullet weights vary. Don't get stuck on the difference between 124 and 125 grains.

[SIZE="4"]9 MM Parabellum				
					
M92 FS Beretta Bar Sto Barrel		
					
					
125 LRN Valiant .356"  3.5 grs Bullseye S&W cases WSP OAL 1.110" 	
27-Mar-06 T = 58 °F

accurate, high percentage failure to feed 
					
Ave Vel =	986.5		
 Std Dev =	9.21		 		 
ES 25.78		
 High	992.9		 		 
Low 972.9		 		
N = 14		 		
					
					
125 LRN Valiant .356"  4.0 grs Bullseye S&W cases WSP OAL 1.110" 
27-Mar-06 T = 58 °F
accurate, consistant function 
					
Ave Vel =	1114			
Std Dev =20.63			 
ES7 9.03	 		 
High 1167	 		 
Low 1088	 		
N = 32	 		
					
125 gr FMJ Olympic Factory  27-Mar-06 T = 61 °F
					
  Ave Vel =	1261		
Std Dev =20?				 
ES  63.11		 		 
High 1288		 		 
Low 1225		 		
N = 10	[/SIZE]

Here is data with three different lots of Bullseye and W231. W231 shot very well.

[SIZE="4"]Walther P5  3.4" barrel			
					
					
125 LRN .356" 4.0 grs Bullseye  Lot 827 (60's/70's) Mixed cases WSP OAL 1.10"
	20-Jun-09	T = 90 °F			
Ave Vel =1065	 			
Std Dev =15.19				
ES =	41.07				
High =	1081				
Low =	1040				
N =	8				
					
					
125 LRN .356" 4.0 grs Bullseye  Lot 827 (60's/70's) Mixed cases WSP OAL 1.10"
	28-Jun-09	T = 93 °F
			
Ave Vel =1072	 	 		
Std Dev =22.44		 		
ES =	107.4		 	
High =	1145		 		
Low =	1037		 	
N =	32		 	
					
					
	 				
125 LRN .356" 4.0 grs Bullseye  1998&2005 mixed lot Mixed cases WSP OAL 1.10"
	20-Jun-09	T = 90 °F			
					
Ave Vel =1038	 			
Std Dev =8.48				
ES =	20.71				
High =	1049				
Low =	1029				
N =	8				

125 LRN .356" 4.1grs W231 Lot 8UB9 Mixed cases WSP OAL 1.10"	
	20-Jun-09	T = 90 °F			
					
Ave Vel =956.1	 			
Std Dev =23.57				
ES =	71.09				
High =	998.1				
Low =	927				
N =	7	
[/SIZE]