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fill you commercial brass to the top with whichever powder you use then dump powder and weigh the powder. then take the mil-surp and do the same thing and you'll know where to start. either you'll have more or less volume with the mil-surp. if you have more then start there and if you have less back an extra grain off or 2 to be safe. mil-surp (7.62x51 nato) brass is lower pressure than 308win and might act differently!Not to hijack this thread but did any of you use milsurp brass at all? I have a ton of it and several hundred Sierra BTHP’s in 168 grain. I have Varget, 4064 and some W748, was wondering just how much less powder a fella needs to use with these cases versus commercial.
The only milsurp cases Ive done much with have had 5.56 headstamps rather than .308. All my .308 experiences are with using commercial brass.
Always good to have options. Like you I want to have more than one powder-load combination for each of my rifles. Dan.OK - It's been forever since I made the original post and I finally got to the range with time to try these.
Instead of the NBT or Accubonds, I ended up loading this all with 165 Sierra Game Kings and all shooting was done with the HCR Harvester Plus with a 20" barrel.
The control group was 45gr of Varget: 2627fps, 6.6fps STDEV about .625"
41gr of ARComp: 2557fps. 6.2fps STDEV about .75"
47.7gr of 2000MR: 2653fps, 5.19fps STDEV. The group was 1.1" but that was probably me. The first 2 were almost the same hole. Point of impact slightly left.
44gr of 4064: 2627fps, 5.18fps STDEV. Group was just around an inch. Same POI as varget.
43.5gr of 4166: 2582fps - this stuff was awful. Huge group. I am not sure why. I had pretty high expectations. But I guess it doesn't matter since IMR stopped making it as far as I know.
I didn't do this perfectly - I should have randomized the shooting order and I didn't spend a ton of time fine tuning any of these. Also, I was rushing towards the end because of life stuff. But all in all, I feel comfortable saying I have 4 loads for the 165 308s if we get into a powder situation again.
Hope this helps
Tim