Ok, I have been doing a lot of work developing a load for my Rem 700 in a 7RM. I have been using the 168rg Berger Classic Hunter. At this time I do not have anywhere to hunt with a distance of over 650 yards (hunting Whitetail in East Texas, not very large) and they were readily available. In the future I would like to use the 180gr VLD's, but that is for another time.
My issue right now is that I have worked up a load for the 168gr Berger CH's, but the velocity is 2,800fps. Here are the details on the load:
- All cases trimmed, primer pockets reamed, flash holes de-burred. Weigh within +/- 2 grains.
- Full length sized, shoulders bumped back .015, all have been fired through same rifle.
- H1000, 67.0gr
- Seated .010 off lands
- All rounds checked for concentricity to no more than .002 out
- WLR primers
This load shoots .15" groups with an extreme deviation of 9.01fps and a standard deviation of 4.58fps. The actual average for five rounds was 2798.33fps.
I started with 5 rounds each of 69.0gr H1000 .010, .020, .030, .050, .070, and .080 off lands. They were shot on a perfectly calm day. All shot well over 1.00" groups, terrible as compared to what it has done before.
So at the suggestion of a buddy, I started loading lower. I loaded five each, (all loaded with H1000)
65.0gr .010, .050, .080
66.0gr .010, .050, .080
67.0gr .010, .050, .080
68.0gr .010, .050, .080
Long story short, it liked 67.0gr and .010 off. Seating depth did not however really make an enormous difference, the Classic Hunters are easier to work with in that regard than the VLD's just like Berger states. The grain of powder/velocity though made an enormous difference. Started with semi-large groups (low velocity) to very tight back up to very large (higher velocity). Like an hourglass.
So do I just live with the lower velocities or maybe try another powder? Would another powder perhaps help or do you think the spread would be related to velocity no matter what the powder? I do know that this rifle has always liked its bullets seated .010 off and I was just experimenting like Berger suggests. It still likes .010 evidently.
I am going to re-barrel at some point, but not yet. Would you guys try other powders or just be happy with a very accurate load that has an extremely low ES and SD, but just does not move all too fast?
Oh, one more thing, 24" barrel.
I posted this in the barrel, ballistics section as well since it kind of crosses both areas. Thanks