#31
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Thanks for the tip on evaluating the muzzle with a q tip. I did look at it with high magnification but visualizing is not necessarily going to tell the story. I wish my bore scope worked with 17 cal stuff. |
#32
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Barrel quality .....
I think your GM barrel is the reason. I've only purchased one GM barrel for a project experiment (45ACP bull barrel I fit to my Ruger 77). I knew I was buying a medium quality barrel from what I had read about them. In other words a barrel of average quality that would be a crap shoot as far as accuracy, but I would be doing the machine work myself.
I would never (?) buy a GM barrel for a rifle project involving expensive smith work and EXPECT match accuracy unless I wanted to GAMBLE for the results. I've always gone with $250 (bulk buy with gun builder friends) to $300+ blanks from PAC Nor (super match) and have never been disappointed with the results. I'd have to say you get what you pay for from my barrel buying experiences! |
#33
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#34
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Douglas,
I agree with you on the barrel. Luck of the draw. I know GM will send another one and ChuckShooter kindly volunteered to chamber the new barrel if Brandon chooses to go that way. It's nice that you can chamber your own to control headspace. When you buy a factory Hornet you get what you get. For a Savage model 12 action we could not headspace off the rim. Savage 12's are designed for rimless cases so when using it with a rimmed case like the Hornet rim has to stay outside the breech in order for the extractor to get over it. BTW, I measured about 20 cases; base to shoulder datum were all very close with an extreme spread of 2 thousandths. Case stretching is minimal. I ordered a bullet seater for the 17HH which arrives next week. It will be interesting to see how much accuracy improves by getting the bullet closer to the lands. |
#35
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Well that's a bummer, I did not think about the extractor on the 10-12-16 actions.
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#36
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Douglas,
At your leisure could you measure one of the rounds you shoot in your rifle chambered by the reamer you loaned me and tell me what the COAL and your jam or jump distance is? Also which bullet; I have both the 20 vmax and 25 HP. I'm just curious to see how close our measurements compare since we used different headspacing methods Thanks, Phil |
#37
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If you are talking to me I can't help much. I am in Montana and the guns and ammo and notes are all in Oklahoma. So relying on memory and what my practice is for mass loading to fire form brass, my OAL should have been factory length. Bullets were 20 gr. V-max. Groups were small, but didn't test for accuracy. I used 1680 powder. The groups had to be under 3/4 inch or i wouldn't have bothered with them.
__________________
Douglas, Gopher Damage Mitigator, Retired |
#38
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Much Better!
I partially pulled out and seated the bullets to get closer to the lands. Groups are now in the high 3's to low 4's. Not as good as guns i reload for but it is factory ammo and will be an effective squirrel puncher out to 250 yards.
I think this technique is a good option for non-reloaders who desire improved accuracy without having to spend a lot of time and money. A cheap press, bullet puller (I like Hornady Collet style) bullet seater and way to measure CBTO. |
#39
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ALRIGHT! !! Glad you found the solution, as easy as pie, just pull the bullets and reseat! Good grief, what a pain. At least it isn't a rebarrel job. Keep us posted on further details, Tom.
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You promised to VOTE in 2012! Please don't renege in 2014! |
#40
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"Groups in the high 3's and low 4's" Those are great groups. So many variables that it is difficult to consistently do better than that with any firearm let alone one built for sporting use using factory ammo (albeit reset bullets). Your SIL should be very very happy with the results. Wish all of my guns shot that well. Burt
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