Posted: 8/13/2016 12:51:21 PM EDT
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So I'm using a scope on my RRA NM to develop loads for service rifle matches. I'm getting .8 MOA average with mixed LC brass, 24.2 R-15, WSR primers and 77 SMK. I tried the 77 SMK with caneleur and they grouped even better. All testing is 5 shot groups. No complaints about this load, I'd like to get .5 with a scope, but with standard rifle primers, not trickling each case and using mixed year lots of LC brass, I'm ok with it for the 300 yd line. For my 600 yd load, best I am producing is about 1.3 MOA, that's with 24.7 of R-15, WSR primers, 80 AMAX, mixed LC brass. I usually get .4 rounds grouping .8 MOA and by the time I get a 5 shot group, I will have 1 flier that opens the group up to 1.5-1.2 MOA. Wondering how important BR primers and same year brass would help. My next step is changing to Vitavori N140 and try this. Any pointers would help. I shoot open sights for matches. Just scoping rifle for load development to take out as much human error as possible.
Forgot to ad, 80s are COAL of 2.450, 77 SMK are 2.255 mag length. |
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Big thing is to sort your brass by same headstamp. Consistency is key in this game. Want small groups? Everything going has to be as close to the same as you can. I'd say sorted case are more important than br primers at this point.
Edit: but not trickling each case I'm assuming your just dumping your powder charge and as long it's at least +/-.1 you think your good? You need to weight every charge and ensure that is is that same as the last one. Consistent rounds make small groups. A |
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My SR short line load has always been:
24.0gr RL15 77gr SMK, Nosler, or Lapua (prefer Lapua) CCI BR4 or Wolf SRM LC brass I went with Wolf SRM later on because BR4 started to get quite expensive, and the Wolf SRM was the rage at that time. I still use BR4 for the 600, though. |
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Quoted:
I legged out with 23.2 XBR and Nosler 77s and 80s at 600. Your ammo will shoot cleans. Don't spend extra time on the load. Learn to build a solid position and to read wind. That's more important than dropping 0.3 tenths of an MOA. +1 If you're getting under 1 moa your load is plenty accurate for high power. The ten ring is 2 moa, the x-ring is 1 moa. As long as you do your part the ammo is up to the task. I have never been able to get any load to consistently group at .5 moa off a bench. This is with over thirty years of high power competition and countless trips to the range for load testing. 5/8" groups are about the smallest I have ever achieved on my best loads. You don't need this to shoot great scores. Spend your time shooting offhand and rapid sitting until you're very comfortable with both. Those are the stages that I need to work on the most. Rapid prone and slow prone is a walk in the park compared to offhand. Any rifle and ammo combination that consistently shoots 1 moa or better is good enough IMO. |