what is what if factor doing this -on barrels ?

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what is what if factor doing this -on barrels ?

Postby cz7 » Sun Nov 17, 2013 4:29 pm

ok a group of 6 of 10 are very tightly group at 100 yds but 4 will fly .its a 20 YHM barrel with 1/7 twist with tory medieval flashhider with good ammo ? what would break the group up ?
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Re: what is what if factor doing this -on barrels ?

Postby Globemaster » Sun Nov 17, 2013 5:41 pm

cz7 wrote: a group of 6 of 10 are very tightly group at 100 yds but 4 will fly

are you shooting this from a bench rest?

cz7 wrote: its a 20 YHM barrel with 1/7 twist with troy medieval flashhider with good ammo

what ammo are you using? and what grain weight?

cz7 wrote: what would break the group up ?

it could be any number of things; lets try to narrow them down; and then eliminate the variables
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Re: what is what if factor doing this -on barrels ?

Postby Thom » Sun Nov 17, 2013 8:34 pm

1st suspect would be the ammo, have you tried a different brand or load?
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Re: what is what if factor doing this -on barrels ?

Postby cz7 » Sun Nov 17, 2013 9:00 pm

its 1/7 twist and less than 1000- rds shot in the barrel corbon ammo 55 grain ,m885 federal ,white box ...I have shot this rifle with 77 grain without a flyers could the twist bring out the flyers due bad loadings of powder loading or powder ? rest on forearm which is troy ....free float one
Last edited by cz7 on Sun Nov 17, 2013 9:10 pm, edited 1 time in total.
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Re: what is what if factor doing this -on barrels ?

Postby Thom » Sun Nov 17, 2013 9:10 pm

1/7 should be perfect for all the heavier & longer bullets so I doubt the rate of twist is an issue.
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Re: what is what if factor doing this -on barrels ?

Postby cz7 » Sun Nov 17, 2013 9:32 pm

the rifle groups well mostly than flyers happen ...its got me in a state of ?????? over this I have never seen this before the sum of the total of parts are good ? flyers at 30 $ of the time ???what the moo ???
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Re: what is what if factor doing this -on barrels ?

Postby Thom » Sun Nov 17, 2013 10:28 pm

Are you certain that the barrel is properly torqued to the upper? Sometimes you can get barrel pivot or wobble if the face of the upper is not true, for many, the first step in accurizing is facing the upper and making sure the index notch is properly relieved.

Still though, the first suspect for me would be the ammo. Also, some barrels show a susceptibility to heat, though that is usually shown in vertical stringing. Are the sights or scope mount tight?
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Re: what is what if factor doing this -on barrels ?

Postby mechanic » Mon Nov 18, 2013 2:12 pm

77gr bullets sound perfect for a 1x7 twist, anything lighter and your going to run in to flighers.
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Re: what is what if factor doing this -on barrels ?

Postby Globemaster » Tue Nov 19, 2013 9:13 pm

Thom wrote:Are you certain that the barrel is properly torqued to the upper?

I was thinking the same thing the other day ...
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Re: what is what if factor doing this -on barrels ?

Postby cz7 » Mon Nov 25, 2013 9:51 pm

thank you for the help ......its time to take down again !!! all so simple but one hair off !!!
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Re: what is what if factor doing this -on barrels ?

Postby Globemaster » Tue Nov 26, 2013 5:44 pm

cz7 wrote:its time to take down again

yup it's worth the effort, and only takes a few minuets too, in order check it, and make sure that everything is 'true' and 'square'
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Re: what is what if factor doing this -on barrels ?

Postby cz7 » Tue Nov 26, 2013 9:10 pm

so simple a design but the marker of the parts can fubar the works up very fast !!!
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Re: what is what if factor doing this -on barrels ?

Postby Dtech » Tue Dec 10, 2013 6:10 pm

While you have it apart, see if you can look into the gas-port and view the far side of the bore. It's a long-shot, but if while drilling or reaming the gas-port, the drill strikes the far side of the bore and leaves a tiny pit, you will get exactly what you are experiencing.

The small pocket fills with soot and powder residue and the barrel shoots great. Once in a while, as the bullet passes that pocket or pit, the bullet will pull the debris out of the pit. The contents of the pit follow the bullet out of the bore, and that bullet will be a flier. Then the cycle starts over. I have seen many over the years.
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Re: what is what if factor doing this -on barrels ?

Postby cz7 » Tue Dec 10, 2013 6:45 pm

Dtech wrote:While you have it apart, see if you can look into the gas-port and view the far side of the bore. It's a long-shot, but if while drilling or reaming the gas-port, the drill strikes the far side of the bore and leaves a tiny pit, you will get exactly what you are experiencing.

The small pocket fills with soot and powder residue and the barrel shoots great. Once in a while, as the bullet passes that pocket or pit, the bullet will pull the debris out of the pit. The contents of the pit follow the bullet out of the bore, and that bullet will be a flier. Then the cycle starts over. I have seen many over the years.

yes ! we seen this the other day with a hawkeye ......why not use edm not a drill ???
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Re: what is what if factor doing this -on barrels ?

Postby Dtech » Tue Dec 10, 2013 6:54 pm

I'm not sure I'm understanding your post. Did you say you found a pit in the bore opposite the gas-port?

I'm not familiar with modern EDM, but what I have worked with was too slow for production drilling.

I have drilled and reamed literally thousands of gas-ports without a single scratch on the far side of the bore. I actually made an entire set of drills and matching reamers with brass stops. It's simply impossible to even touch the far side of the bore with my tooling.
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Re: what is what if factor doing this -on barrels ?

Postby cz7 » Mon Dec 23, 2013 4:05 pm

http://en.wikipedia.org/wiki/Electrical ... _machining a bit of reading on /what is EDM ...very nice and clean way to drill holes etc without burrs etc ....
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Re: what is what if factor doing this -on barrels ?

Postby cz7 » Thu Dec 11, 2014 5:10 pm

well its the upper receiver face is off angle ......sorry i was very sick with two heart attacks and gull blatter troubkes .......OUCH !!! 8 months of hell !!!
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Re: what is what if factor doing this -on barrels ?

Postby Globemaster » Thu Dec 11, 2014 7:05 pm

well that doesn't sound like very much fun ... glad your back :thumbs up:
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Re: what is what if factor doing this -on barrels ?

Postby cz7 » Thu Dec 11, 2014 8:12 pm

thank you ....no fun !!
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