7.62x51 load data question

unicom

Well-Known
Rating - 0%
0   0   0
May 19, 2016
1,147
113
Just want to double check. But when using data for 308 win, should I be reducing it by roughly 10%?


Sent from my iPhone using Tapatalk
 

unicom

Well-Known
Rating - 0%
0   0   0
May 19, 2016
1,147
113
AR10 should handle most .308 loads just fine. But build your loads by carefully working up to them and be cautious of mil brass as the heavier 7.62x51 case walls render a slightly reduced volume for powder.

I did about a 10% reduction in powder for the 7.62x51 load. So instead of the 44.7gr for 308 I went with 40.2gr load


Sent from my iPhone using Tapatalk
 

unicom

Well-Known
Rating - 0%
0   0   0
May 19, 2016
1,147
113
Thanks again for the help from all you guys/gals that answered.


Sent from my iPhone using Tapatalk
 

TexMex247

TGT Addict
Rating - 100%
16   0   0
May 11, 2009
2,942
113
Leander(NW Austin)
Sounds like you reduced a bit more than necessary. When I tested NATO lake City vs 2 commercial brands of 308 the internal case capacity was only about 1% difference. It's a common myth but nothing wrong with being cautious. I have some nice loads dialed in for a bolt rifle that are approaching too much with my AR10. At 43.5gr of IMR 4064(w/175gr pills) I'm getting noticeable case head swipes from the extractor and bolt.

It's not a brass destroying load but it definitely leaves a mark. I've decided to shift to 150s. The rifle has showed some potential in the past with them. I still like the thought of a one load two gun solution but realistically I doubt I'll ever stretch the AR10 beyond 300 yards. It seems it's at 600+ yards where the heavies really shine.

After a few batches I bet you wind up within 2 grains of max and not 4. Once again, no issues with be cautious, you just might waste a pound or so of powder along the way.
 

unicom

Well-Known
Rating - 0%
0   0   0
May 19, 2016
1,147
113
Sounds like you reduced a bit more than necessary. When I tested NATO lake City vs 2 commercial brands of 308 the internal case capacity was only about 1% difference. It's a common myth but nothing wrong with being cautious. I have some nice loads dialed in for a bolt rifle that are approaching too much with my AR10. At 43.5gr of IMR 4064(w/175gr pills) I'm getting noticeable case head swipes from the extractor and bolt.

It's not a brass destroying load but it definitely leaves a mark. I've decided to shift to 150s. The rifle has showed some potential in the past with them. I still like the thought of a one load two gun solution but realistically I doubt I'll ever stretch the AR10 beyond 300 yards. It seems it's at 600+ yards where the heavies really shine.

After a few batches I bet you wind up within 2 grains of max and not 4. Once again, no issues with be cautious, you just might waste a pound or so of powder along the way.

I appreciate the info. I don’t want to unnecessarily waist powder. The load data was from Hornady using IMR4895. The 308 showed 44.7gr to be just below the max at 46 something. I most likely won’t be loading a lot of nato just happened to have some brass lying around. Thanks again for the info.


Sent from my iPhone using Tapatalk
 
Top Bottom