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Old February 28, 2013, 11:06 AM   #4
Slamfire
Senior Member
 
Join Date: May 27, 2007
Posts: 4,133
I tested H4895, which is an “extreme” powder in my bolt rifles and M1a’s. An M1a has a 22” barrel and is closer to your 20” barrel than my bolt rifles. I tested with the old 174 FMJBT, because I have them and they are cheaper than SMK’s. I think any charge between 40.5 and 41.5 will shoot very well. I am using 41.5 grains with a 175 SMK at 600 and 1000 yards. I consider this a maximum load in my LC cases. The load shoots well and I shoot HM scores at 600 with it. My best with it was a 199 and a high X count.

Code:
   M1A Super Match  22" 1-10 6 groove Douglas
				
				
174 FMJBT 40.5 grs H4895 wtd, lot 4501 LC mixed WLR 
	 	OAL 2.800" 	
18 May 2008 T =  71 °F			
				
Ave Vel =	2524			
Std Dev =	36			
ES =	90			
High =	2587			
Low =	2497			
N =	5			
	good group			
				
174 FMJBT 41.0 grs H4895 wtd, lot 4501 LC mixed WLR 
	 	OAL 2.800" 	
18 May 2008 T =  71 °F			
				
Ave Vel =	2594			
Std Dev =	14			
ES =	30			
High =	2609			
Low =	2579			
N =	5			
				
				
			
174 FMJBT 41.5 grs H4895 wtd, lot 4501 LC mixed WLR 
	 	OAL 2.800" 	
18 May 2008 T =  71 °F			
				
Ave Vel =	2593			
Std Dev =	15			
ES =	42			
High =	2613			
Low =	2571			
N =	5			
	Best group			
				
174 FMJBT LC79 Match M118 White Box 	
18 May 2008 T =  71 °F			
				
Ave Vel =	2550			 
Std Dev =	16			
ES =	41			
High =	2564			
Low =	2523			
N =	5			
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