Ruger Mini-14 and Mini-30 Ruger Mini-14 and Mini-30 family of rifles

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Old 09-06-2011, 20:17   #1
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u guys seen this vid?

thought it was kinda cool

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Old 09-07-2011, 02:41   #2
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Great Video, thanks for the post. I've seen a video on an AK-47 doing doing the same thing... I would really like to see one done on the newer heaver barrel Mini for comparison.

Last edited by PABin25; 09-07-2011 at 14:05.
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Old 09-07-2011, 06:25   #3
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Accu-strut should use this video.
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Old 09-07-2011, 08:23   #4
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Wow, I did not know the mini had "that" much flex in the barrel.
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Old 09-07-2011, 15:31   #5
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The video for the AK-47 is even more dramatic (yes, I've considered developing a strut for the AK).
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Old 09-07-2011, 16:51   #6
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So...are there two factors in play that affect accuracy in the "pencil" barrels? The flex that occurs with every shot and the vertical stringing as the barrel heats up?
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Old 09-07-2011, 17:43   #7
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Use your cursor and watch: All or most of the flex occurs after the muzzle blast. Just sayin.
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Old 09-07-2011, 17:48   #8
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that is the old skinny barrel right, that is not the new heavy barrel.
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Old 09-07-2011, 17:55   #9
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I'll say it again, there is no visible flexing until the round has left the barrel. And the action doesn't start to cycle until the round is gone.

Sorry, the "skinny barrel" thing doesn't wash.

Last edited by Bolero; 09-07-2011 at 18:02. Reason: more
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Old 09-07-2011, 18:45   #10
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I disagree. I can't see much of it but I think the barrel starts to flex before the round gets all the way down the tube. It's not flexing much but my guess is as the hot energy gas ball is going down the tube it's already expanding and bending the barrel. It's most obvious after it leaves but you can't flex the barrel that much and NOT have it swelling the barrel and stressing it.

It only takes a small amount of flex to change the point of impact. When Ruger changed to the fatter barrel there is no doubt the same ammo became much more accurate and the reason why is, much less flex. kwg
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Old 09-07-2011, 18:59   #11
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I disagree. I'll admit that one's take on the video is subjective, but I "accurized" my 185 series by glass-bedding the action, smoothing the sear, and feeding it the right handload. 1"/100 yds with 4X scope. I I would guess it flexed as much as the one in the video.

From what I've read here, the so-called "heavy barrel" mini isn't much more accurate with factory ammo than the old ones. Some folks are lucky, however.

You HAVE to handload with almost any rifle to get 1 MOA.
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Old 09-07-2011, 19:09   #12
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All barrels flex to a certain extent as the bullet travels down the barrel. The point of building consistent handloads is to have the barrel at the same spot in it's oscillation each time a bullet leaves it so they will hit the target in roughly the same spot as the previous bullet. All that whipping around after the bullet leaves is of no consequence. That sure is a bitchin video, though!
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Old 09-07-2011, 19:12   #13
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"All barrels flex to a certain extent..."

Exactly. That is called harmonics, and consistency is all that matters.
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Old 09-07-2011, 20:48   #14
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I'll ask my question another way.

Using consistent hand loads, on a bench rest:

1. Barrel at 70 degrees F, fire a single shot, let barrel cool to 70 F. Repeat for 9 more shots.

2. Dump however many rounds it takes to bring barrel to, say, 200 F. Fire 10 more shots.

Would the expectation be that the second 10 shot group has a larger spread than the first 10 shot group? Would that second group show more vertical spread than the first one?
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Old 09-08-2011, 00:05   #15
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Does anyone have a video of the same nature of any of the various struts available?
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Old 09-08-2011, 00:30   #16
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I've done a wee bit of scientific data collection on the Mini and how it shoots (), so thought I'd share...

Yes, there are (at least) 2 error modes involved with the Mini, one is the harmonics of the thin barrel, the other is thermal stringing. The effects must be separated out for proper experimentation and accurizing.

Thermal stringing is a problem for most thin-barrel minis. Cryoing always solved the problem for us, and it got to the point where we would automatically have the barrel cryo-treated before accuracy tests. I am not sure how much of a problem it is for the newer thick barrel. I also don't know if group size changes with a hotter barrel. Intuition says it will, but I have not run those particular experiments (better to simply solve the problem!)

The thin barrel of the earlier Mini is indeed a source of accuracy-killing harmonics. In fact, it is a concern for any barrel size, it's just much more pronounced for a thinner barrel. Can this really be a question, as common knowledge indicates accuracy and barrel diameter tend to be directly related? Sniper rifles tend to have heavy barrels, competition barrels thicker still. I don't think they would build them this way for nothing, considering the weight a heavy barrel adds. Current history is replete with experimental and anecdotal evidence that the newer 5/8" barrels are roughly twice as accurate as the older 9/16" Minis.

I have often heard the opinion that the bullet leaves the muzzle long before a barrel vibration, and have always wondered how this could be. Thinking in terms of acoustics, a barrel vibration is basically a sound wave. Sound travels through steel at approximately 17x the speed of sound through air, so over 19,000 fps. A .223 bullet leaves the barrel at only around 3000 fps (and must be accelerated first). By definition something must reach the muzzle before the bullet does, maybe it's too hard to see the initial movement even with time lapse.
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Old 09-08-2011, 09:14   #17
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I've been looking at this company http://www.teludynetech.com/index.cfm Although I think they may be way to thick to work on a mini. I do think there theory and purpose of the straight jacket is worth the read.
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Old 09-08-2011, 10:58   #18
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If open page up and watch full screen then start /stop the video around the 40-45 sec frames you will the whip go up and then the whole gun will start rising before you see the flash. I watched it about 20x. There is movement before the bullet leaves the barrel.
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Old 09-08-2011, 17:15   #19
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J-place I tried the link and it did not work. kwg
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Old 09-08-2011, 18:45   #20
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I fixed the link.

Custom Rifle Barrel Manufacturer Greenville, SC - Teludyne Tech Inc.
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Old 09-08-2011, 18:59   #21
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i try to post sumtin cool and this is what happens???? good grief!
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Old 09-09-2011, 03:29   #22
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Originally Posted by whofarted View Post
i try to post sumtin cool and this is what happens???? good grief!
You still got a bunch of cool points! I like it! I watched it 20x trying to find the frame were the bullet left the barrel, I think it was right before the big flash and after the small flash. It spurred some good conversation!
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Old 09-10-2011, 15:41   #23
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I keep coming back to this video because it helps me understand the operation of the mini. I was always under the impression that the force of the spigot on the gas block blowing the operating rod back raised the barrel before the bullet left was the cause of some of the inherant inaccuracy of the mini 14 platform. Not the case! Thanks for posting the video, Whofarted. By the way, he who smelt it, delt it.
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Old 10-20-2011, 21:53   #24
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thanks for the cool vid and sparking educational insight.
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Old 10-21-2011, 14:44   #25
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I think someone needs to do this test on a mini with a high speed camera. The military did some testing on sniper rifles some years ago, and showed the barrel torque and slap when firing a 7.62 from different types of barrels.

They also did a gas expansion test. They made longer and longer barrels for a universal receiver to find out at what point the length no longer helped velocity. They got close to 10 feet before the bullet speed maxed out...at a ridiculous muzzle velocity....LOL.
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