As some of you may remember I posted some chrono data back in December and some problems I may have had.
http://www.accurateshooter.com/forum/index.php/topic,3738076.msg35819902.html#msg35819902
I finally got back to the range today and made some adjustments to the load trying to get SD, ES and velocity where I wanted it. I tried increasing neck tension and varying the charge to see where I would head.
The book data is for .308 winchester, 168g sierra match kings bthp, large rifle primer, 42.0g re15, seated to 2.800 inches should yield 2600 fps.
My loads and data is as follows. I have included high low es sd and velocity to keep it simple.
1st string 7 shots. Federal brass full length sized, 168 SMK, fed 210m primer, 42.0 grains RE15, seated @ 2.800"
High 2502
Low 2441
ES 61
SD 20
2nd 10 shots. Hornady Match Brass, neck sized with .335 bushing, 168 SMK, fed 210m primer, 42.1 grains RE15, seated 2.800
High 2468
Low 2316
ES 152
SD 41.7
3rd 10 shots. Hornady match Brass, neck sized with .335 bushing, 168 SMK, fed 210m primer, 42.4 grains RE15, seated 2.945"
High 2466
Low 2372
ES 94
SD 28.3
4th 10 shots. Hornady Match Brass, neck sized with .331 bushing ( better neck tension) 168 SMK, fed 210m primer, 42.6 grains RE15, seated 2.945"
High 2475
Low 2414
ES 61
SD 22.6
The groups are close in size, but the best group at 100 was probably #1 then # 3 by #4 I think I was spent and it was useless to measure it. I was also more worried about hitting the chronograph then perfect shooting!
My thought is to leave the smaller bushing and longer length, bump the charge up to 43.0, 43.2 and 43.4 and see what numbers are revealed. 43.6 is max published, but I am bellow velocity and I am longer then published length so I think I will be safe even a little above the max published.
Suggestions or thoughts?
http://www.accurateshooter.com/forum/index.php/topic,3738076.msg35819902.html#msg35819902
I finally got back to the range today and made some adjustments to the load trying to get SD, ES and velocity where I wanted it. I tried increasing neck tension and varying the charge to see where I would head.
The book data is for .308 winchester, 168g sierra match kings bthp, large rifle primer, 42.0g re15, seated to 2.800 inches should yield 2600 fps.
My loads and data is as follows. I have included high low es sd and velocity to keep it simple.
1st string 7 shots. Federal brass full length sized, 168 SMK, fed 210m primer, 42.0 grains RE15, seated @ 2.800"
High 2502
Low 2441
ES 61
SD 20
2nd 10 shots. Hornady Match Brass, neck sized with .335 bushing, 168 SMK, fed 210m primer, 42.1 grains RE15, seated 2.800
High 2468
Low 2316
ES 152
SD 41.7
3rd 10 shots. Hornady match Brass, neck sized with .335 bushing, 168 SMK, fed 210m primer, 42.4 grains RE15, seated 2.945"
High 2466
Low 2372
ES 94
SD 28.3
4th 10 shots. Hornady Match Brass, neck sized with .331 bushing ( better neck tension) 168 SMK, fed 210m primer, 42.6 grains RE15, seated 2.945"
High 2475
Low 2414
ES 61
SD 22.6
The groups are close in size, but the best group at 100 was probably #1 then # 3 by #4 I think I was spent and it was useless to measure it. I was also more worried about hitting the chronograph then perfect shooting!
My thought is to leave the smaller bushing and longer length, bump the charge up to 43.0, 43.2 and 43.4 and see what numbers are revealed. 43.6 is max published, but I am bellow velocity and I am longer then published length so I think I will be safe even a little above the max published.
Suggestions or thoughts?
