I think we might be long lost brothers! I only learn one way, and that's the hard way.
2 years in...what I've learned.
- Thread starter StumpyJohnson
- Start date
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When a rifle "won't shoot" after a few prospective loads, say 1-2 projectiles, 1-2 powders with a 2-3gn spread in .5gn increments, it's time to pull the stock, scope, mounts, and start looking for mechanical maladies.
Things touching things they're not supposed to touch.
Scope-base screws on bbl tenon,
action screws bottoming out on the action before they tighten the action to the stock, or touching the stock somewhere in the hole
The bbl making contact w/the stock where it shouldn't to include flexing/vibrating contact during recoil
bbl'd action teeter-tottering on the recoil-lug and/or magazine, bottom-metal teeter-tottering on a high spot in the inlet.
Scope-rings with enough misalignment to torque the scope
The scope making contact w/the bbl.
Sling-swivel studs dragging on front or rear bags during recoil
Then the scope itself.
Get the mechanics right and you'll find a lot more of those "unicorn" rifles that seem to shoot everything well. Get them wrong and you can tinker until the world runs out of components.
Things touching things they're not supposed to touch.
Scope-base screws on bbl tenon,
action screws bottoming out on the action before they tighten the action to the stock, or touching the stock somewhere in the hole
The bbl making contact w/the stock where it shouldn't to include flexing/vibrating contact during recoil
bbl'd action teeter-tottering on the recoil-lug and/or magazine, bottom-metal teeter-tottering on a high spot in the inlet.
Scope-rings with enough misalignment to torque the scope
The scope making contact w/the bbl.
Sling-swivel studs dragging on front or rear bags during recoil
Then the scope itself.
Get the mechanics right and you'll find a lot more of those "unicorn" rifles that seem to shoot everything well. Get them wrong and you can tinker until the world runs out of components.
WYO300RUM
Well-Known Member
Stumpy,
I agree with about everything in your first post.
I had an awaking last year. A 300 win mag load. Everything the same except case. One Norma and other ADG. The ADG load was half the size group. No joke. I've had same thing happen with different primers but not as dramatic. I did a test a couple years ago with a 6.5 PRC. Same load but one with Fed 210M and other with CCI BR200. The SD and ES was way lower with the Fed 210M. The group size wasn't much different. Seating depth is the last thing I mess with. I'm just a hunter. If my groups are half in. at 100 yds. I'm happy but most likely will try to better. Have funny story with a 3 shot one hole group with a 300 WM recently but this post is too long already.
I agree with about everything in your first post.
I had an awaking last year. A 300 win mag load. Everything the same except case. One Norma and other ADG. The ADG load was half the size group. No joke. I've had same thing happen with different primers but not as dramatic. I did a test a couple years ago with a 6.5 PRC. Same load but one with Fed 210M and other with CCI BR200. The SD and ES was way lower with the Fed 210M. The group size wasn't much different. Seating depth is the last thing I mess with. I'm just a hunter. If my groups are half in. at 100 yds. I'm happy but most likely will try to better. Have funny story with a 3 shot one hole group with a 300 WM recently but this post is too long already.
