Schuster plugs and the 7th round syndrome - Gun Hub
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Old 07-04-2007, 09:30 PM   #1
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Schuster plugs and the 7th round syndrome

Thanks once again for the wealth of information here.

I have a 1943 field grade that shoots pretty well. I don't like finicky machinery of any sort, so got the Schuster plug to allow for a greater range of ammo.

I spent a couple of hours one day adjusting the plug from the "won't pick up next round" to normal function. Last Saturday I tried some accurate shooting and had disappointing results.

I also had a problem with the 7th round not loading. I did a search on this forum and learned about the 7th round syndrome, loaded the enbloc accordingly and that went away.

At that point I realized I'd over tightened the Schuster previously thinking the 7th round failure was due to the plug setting.

Well, today I backed off the Schuster adjustment and finally got it right. I'll let you guess which of the attached 50 yard target images is before and which is after adjustment.
Attached Images
File Type: jpg Schuester Adj2.jpg (58.2 KB, 938 views)
File Type: jpg Schuester Adj1.jpg (58.8 KB, 938 views)
Guy B. Meredith is offline  
Old 07-05-2007, 03:34 AM   #2
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So is the bottom target=

The one with the gas nut open all the way rendering the gun a straight pull bolt action then? That would be a wonderful target at 100 yds. What kind of ammo were you useing by the way? Nice targets by the way, both are quite nice groups.
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Old 07-05-2007, 06:48 AM   #3
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Actually the top target is the overly tightened plug, the bottom adjusted just tight enough to operate correctly.

The verbiage somewhere in the advertising or documentation for the plug says one quarter turn can make a difference in groups and I guess it does. I had just thought it would allow for different types of ammo.

In my original setup I didn't realize that the 7th round fails to pick up for reasons other than the plug setting, so kept tightening to try to get the 7th round to load. Ended up winding the plug adjustment all the way in, thought that must be the equivalent to the standard plug setting.

I had disappointing (depressing) groups on the Saturday run and constant failure to load the 7th round. Went back yesterday to shoot to celebrate Independence Day and followed advice on this forum to alleviate the problem with the 7th round. I then realized I had possibly over adjusted the plug, went through setup again with the bottom target resulting.

Seeing the rifle group consistently like that was a relief after the very disappointing Saturday. Glad my mistake didn't damage anything.
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Old 07-05-2007, 08:35 AM   #4
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Neglected to mention that the ammo is LC delinked stuff. I have some Greek on order based on comments here, but it did not arrive in time as I had hoped.

Should be here July 10 and I'll be looking for the first chance to get to the range to compare the two.
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Old 07-05-2007, 06:38 PM   #5
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Nice targets...but after the first why didn't you go up one, left one?
It would have really made an impressive second target.
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Old 07-05-2007, 08:14 PM   #6
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I didn't correct the sights as I had been having more fun than I was supposed to that day and late for doings back in the neighborhood.

The front sight is quite a ways off and I'll need to spend time with that. I saw comments somewhere about how much to move the front sight for a given amount of adjustment in POI, but didn't have that at hand so would need to poke at it a bit.

All in all, I was just satisfied that I'd not done damage and that this day had been as good as Saturday had been bad. Same goes for the revolver shooting both days.

I kidded with a fellow shooter that on a day like Independence day I could let my imagination go when looking through the sight of this historic rifle--that the target out there was really one of Hitler's finest and yesterday Hitler's men were having a bad day.
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Old 07-07-2007, 07:04 AM   #7
 
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I tried searching for the meaning of the 7th Round Syndrome but I was unable to locate the problem you are talking about. Please advise. Thanks for your help.
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Old 07-07-2007, 09:20 AM   #8
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Just do a search on 'seventh' or '7th'.

Many Garands fail to properly load the 7th round from the enbloc clip when the top round (#1) is on the right side of the enbloc clip. This is fixed by loading the rounds so that the top round is on the left.
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Old 07-07-2007, 02:20 PM   #9
 
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7th Round

Thanks. Tom Luhmann just assembled my "new" 1955 SA M1 with everythng new except the receiver which was a 5mil9hundred. I shot a 261-3x out of 300 in a John M. Garand match at the Sacramento Shooting Center last Saturday morning. Very good score for an old man that is out of practice. The only problem I had was in the slow prone using the sled devise. Most of the time I had to press down on the round and force the sled down before the catch would release the bolt and seat home. Don't know what the problem is. I'm using a new DCM wood set that needs to be treated with something. It's a little dry but very attractive. I also found that these new stocks need to be re-leaved in the area of the clip latch before the clip can be released manually. Thanks for your help. Since I'm left handed I will remember left round in the clip top.
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