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Joined: Jun 2013
Posts: 99
Campfire Greenhorn
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Campfire Greenhorn
Joined: Jun 2013
Posts: 99 |
Doing some load work up on a new rifle. .280 Ackley. Several good loads and break in work later an interesting pattern has emerged. There will usually be two tight groups mostly within a 1" of the other group. They seem to be one above the other. Often I will get three shots tight and one 1" above. This is about 100% of the time.
59 grns IMR 7831-Nosler Case-Fed210M-Nosler 140 AB
62 grns R22 " " "
60 grns H4831 " " "
Neck sized cases...... Although will be trying full length...
Free floated barrel
EGW Picatinny rail Torqued 25 inch lbs
Warne Rings Torqued 20 inch lbs
Remounted and retorqued once and will retest.
Vortex Viper scope
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Joined: Apr 2010
Posts: 4,024
Campfire Tracker
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Campfire Tracker
Joined: Apr 2010
Posts: 4,024 |
Could be the scope losing zero after a few shots or the barrel could be heating up and making contact some where on the stock.
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Joined: Mar 2007
Posts: 9,214 Likes: 3
Campfire Outfitter
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Campfire Outfitter
Joined: Mar 2007
Posts: 9,214 Likes: 3 |
How many rounds before the shift? Is it always a 1moa shift?
What kind of groups are you getting overall?
I would not buy something that runs on any kind of primer given the possibility of primer shortages and even regulations. In fact, why not buy a flintlock? Really. Rocks aren't going away anytime soon.
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Joined: May 2014
Posts: 10,525 Likes: 16
Campfire Outfitter
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Campfire Outfitter
Joined: May 2014
Posts: 10,525 Likes: 16 |
Retorqued the stock screws?
I prefer classic.
Semper Fi
I used to run with the hare. Now I'm envious of the tortoise and I do my own stunts but rarely intentionally
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Joined: Jun 2013
Posts: 99
Campfire Greenhorn
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OP
Campfire Greenhorn
Joined: Jun 2013
Posts: 99 |
Remounted and re-torqued Everything. Used slightly higher values. 22 Ips on the rings 25 Ips on the base. Seems to have taken care of it. Maybe I smashed the gremlin.
mw
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Joined: Mar 2007
Posts: 9,214 Likes: 3
Campfire Outfitter
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Campfire Outfitter
Joined: Mar 2007
Posts: 9,214 Likes: 3 |
One last thing to watch is the screw length. If they bottom out, it can amount to a loose base,cause weird barrel harmonics and bolt pressure.
I would not buy something that runs on any kind of primer given the possibility of primer shortages and even regulations. In fact, why not buy a flintlock? Really. Rocks aren't going away anytime soon.
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Joined: Jun 2013
Posts: 99
Campfire Greenhorn
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OP
Campfire Greenhorn
Joined: Jun 2013
Posts: 99 |
Thanks for the good advice.
mw
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Joined: Jun 2013
Posts: 99
Campfire Greenhorn
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OP
Campfire Greenhorn
Joined: Jun 2013
Posts: 99 |
One more thing that I found. I could flex the barrel with a good grip and it touched the barrel channel. Took the rasp to that and torqued to 55 inch lbs. Barsness reminded me if it will touch with hand pressure it might during recoil. I also saw a shining line down the back wall of the rear pillar. I think the screw was making contact, reamed that out also. No more flyers or two groups. The groups 5 shot are right around an 1" and in a group. Three shot groups are sometimes real tight. But the damn 4th and 5th shots usually open it up. The kid will have to live with it.
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