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Need help with fliers

 
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  #1  
Old 10-18-2011, 09:41 AM
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Need help with fliers

Hey guys, need some opinions.

I have not had any time this summer to shoot much this summer, and now coming down to crunch time. I had a Painkiller brake installed on my rifle this summer, by a smith that I am not very impressed with. (Different story) Took the rifle to the range Sunday with the old load that I have used the last two years to verify zero. Now I am having an occasional flier. Off the paper at 200yrds.

So today I am going to start load development. Before I head to the range this afternoon any thoughts would be appreciated.

Thanks,

Steve
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  #2  
Old 10-18-2011, 11:44 AM
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Re: Need help with fliers

What is the bore diameter of the PK reamed to? Should be 20 thou over bullet diameter. If its to large you can often get turbulance around the bullet. If its to tight, or was not deburred, you may be getting some bullet to brake contact.

I have never seen a rifle shoot worse after getting a PK installed compared to how the rifle shot before. They always seem to shoot at least as well as before if not better.

Was the muzzle recrowned after fitting the muzzle brake. It should have been.
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #3  
Old 10-18-2011, 02:17 PM
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Re: Need help with fliers

Thanks Kirby,

I expected it to shoot better as well. I don't know that those things were done. So I will have another smith check it.

Steve
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Old 10-18-2011, 02:21 PM
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Re: Need help with fliers

Would it make sense to stick a dowel in the bore and check the clearance? I would guess that if the clearance is not uniform that it may allow the gasses to escape unevenly.

edge.
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Old 10-18-2011, 05:13 PM
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Re: Need help with fliers

Also, the barrelled action had to come out of the stock to go in the lathe. So, check that your barrel is still floated and action screws torqued properly.

Same for scope, etc...

-- richard
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  #6  
Old 10-19-2011, 06:34 AM
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Re: Need help with fliers

Thanks guys,

I took it to another smith yesterday. It appears that the bore diameter of the pk was not opened up enough, nor was the barrel re-crowned. This smith is getting it done for me by noon so that I can get to the range today and with some luck get out of here today to go hunt for the next four days.

Steve
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  #7  
Old 10-19-2011, 08:37 AM
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Re: Need help with fliers

Recrowning the muzzle is critical, at least if you install the muzzle brake the correct way by machining the muzzle threads true to the axis of the bore, generally to do this you use a live center to support the muzzle end which rides in the crown. This can create a small lip at the end of each land at the muzzle and really cause accuracy problems.

The bore not being large enough is a serious safety issue. I would probably not go back to that smith that installed the brake!!!
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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