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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/30/2008 at 13:10
Dale Clifford View Drop Down
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up in the 1000 rds area of rounds downrange, thought I'd give a report
no way to upload, so this is a digital picture of the computer screen in a Cad program, if the group size for barrel rejection is 50% larger than starting groups size it would be about 1.5 and if 50% than smallest group size it would be about 1.2,
the checker board pattern is a moire pattern---

cascaded 'asynchronous' spatial sampling processes, from the sampling frequency, the software, and raster settings. when the picture is in enlarged it takes on a different pattern. If the graph is extrapolated the projected round count will be around 1400 at the designated rejection.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/30/2008 at 13:13
Dale Clifford View Drop Down
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notice the distance between the end of the bullet and the micro leg-- this is the distance of the actual wear on the lands. be interesting to see when the bullet "falls" down the barrel
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/30/2008 at 14:58
RifleDude View Drop Down
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Interesting info, Dale.  Your results seems to be pretty much in line with what we've always heard about barrel life for the cartridges with a reputation for being "barrel burners."  Your M22 shoots good!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/30/2008 at 15:37
Dale Clifford View Drop Down
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most have the bell curve on barrel life at about 1250 as the median, what will interesting to me -- if the fit wil be linear or start up sharply.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/30/2008 at 16:29
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uuuhhh what?!  Whacko  Could you dumb it down for me?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/30/2008 at 16:32
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me too Say%20What
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/30/2008 at 19:00
Dale Clifford View Drop Down
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http://www.opticstalk.com/forum_posts.asp?TID=5574&PN=1
started as a post about a year ago, on barrel burners,
main point was when a barrel is shot out-- is it still good for hunting, (accurate enough).
the wear is plotted against group size.
it was agreed at the time that a group size 50% larger would signal a "shot out barrel"
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/30/2008 at 19:43
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so does y= group size, and x= throat erosion?  I understand the 50% larger group size being the rejection point.  I take it you are seeing how many rounds it takes to get to that point.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/30/2008 at 21:53
Dale Clifford View Drop Down
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yes-- one item not kept consistent was set back and rechambering- because the gun was shooting so good, frankly I thought it would go sooner, these are really hot loads 140 gr, 2900 fps for this gun and caliber.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/31/2008 at 20:50
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Your plot data definitely demonstrates the "barrel break-in" accuracy improvement.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/31/2008 at 21:59
Dale Clifford View Drop Down
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yes -- and also the cleaning of the carbon collar around 700 rds.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/11/2008 at 11:53
Dale Clifford View Drop Down
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interesting group -- center shot was first shot with following 4 to the right. land erosion is the same as last time and has stopped. scope (z6) has gotten looser in the euro fast focus and may be contributing factor.  could be errors cancelling errors. if over all group size takes into consideration the first shoot group would be with the previous definition of shot out, or 50% larger than starting.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/13/2008 at 10:25
RifleDude View Drop Down
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How many rounds has the Cooper digested at this point, Dale?
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