#1
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Ease of Cleaning Fast-Twist Barrels
Recently, I've experimented with fast twist barrels (8" Lilja, Hart) and low-drag bullets. It seems that the fast
Last edited by Harold M; 03-07-2019 at 12:36 PM. |
#2
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No trouble here with any of mine.
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"That which does not destroy me, has made a huge tactical error" |
#3
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I’ve got an 8 twist AR-15 (chrome lined) and it is one of the easiest barrels to clean. But then again it is chrome lined and so far I’ve only shot 55 gr VMax which has a lot less bearing surface than the bullets you’re using.
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There are three kinds of men: The one that learns by reading... The few who learn by observation... And the rest, who have to piss on the electric fence for themselves...!! |
#4
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Harold,
It seems obvious as you know, it will take more effort to push something through a faster twist, but do you mean it takes more passes of whatever you push through to achieve the same result? Ken. Ps. Did the snow get you?
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" Pay it forward buddy" Get up each morning and don’t let the old man in. (Clint Eastwood). Last edited by kenbro; 11-20-2014 at 07:01 AM. Reason: Insert words. Ps. |
#5
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Is it only on the one barrel or have you experienced it on others? Sometimes it seem to me that even with good named barrels one will just be a bit more difficult than it should be to clean IMO, and that's even though I used the same break-in process as always??
Other that AR's I have no experience with fast twist barrels as I'm not a "mortar man" so to speak so I was just guessing at other possibilities? Keep us posted as to what you figure out .
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"Shoot safe!!" montdoug |
#6
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Usually longer/heavier bullets have longer bearing surfaces ie. 1 long bullet might foul as much as 2 shorties.
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#7
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Interesting subject, Harold.
As has been mentioned, longer bullets, much faster rpm/higher torque/higher rotational land pressure.
I'll add that the effective land/groove "length", that each bullet rides through, is longer. For example, a 28" barrel with a 14"twist.......versus a 28" barrel with a 7" twist. The bullet in the 7" twist has to rotate 4 turns.......while one in the 14" twist only rotates 2 turns. Therefore a "point", on the bullet's bearing surface, rotates through twice the effective distance......in the same 28" barrel length. Clear as mud, huh? My head hurts. Kevin |
#8
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6.5mm fast twist barrels have never given any trouble cleaning for me & they are 7 1/2" to 8" twist normally.
I suspect a smaller bore might work the bearings in the rod a bit harder, or be more prone to skipping with a rod that is not working correctly - I have one of those. It makes sense they might foul more due to the steepness of the hill the bullet must climb. I would think 3 grooves would clean easier than 4 to more. 9 twist .172 Pac-Nor cleans easily. Maybe it's all subjective on equipment used.
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Daryl |
#9
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Lots of things come into play like if the barrels are chambered for a faster cartridge, barrel to barrel differences, and the other things already mentioned.
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#10
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Ask your brush how it likes going up against the steeper walls.......
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