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Offline pigkiller

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Vertical Stringing
« on: March 30, 2008, 03:08:29 PM »
HI Guys! Have been reading your post at this site for some time now and you fellas made me buy a 223 ultra!!!! Picked it up from gun shop last Thursday with Leupold 4-12 installed.  Cleaned bore thoroughly then after every shot for 10 rounds,then every other round then every third etc.  Have put about 80 rounds through it.  Groups started out at MOB(minute of basketball) but after about 40 rds stated improving.Need help with the vertical stringing.
 Shot 3 5 shot groups, all start about 3inches high and by the fifth shot are 3 inches low.Horizontal variation .5 max right / left.
These were three different loads with 2 powders.  Chronograph shows less than 30 fps variation within each load.
Why are these POI's steadily moving Down on each load?
Had the forearm sitting on the front sandbag, should have moved it back under the hinge pin as recommended in the FAQ's.
Any suggestions before my next trip back to the shooting bench?
Thanks for any and all help!
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Offline quickdtoo

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Re: Vertical Stringing
« Reply #1 on: March 30, 2008, 03:14:14 PM »
Welcome aboard see the Handi Basics 101.   ;)

Tim
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Offline 95Road King

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Re: Vertical Stringing
« Reply #2 on: March 30, 2008, 03:45:35 PM »
Rule of thumb for vertical stringing IF everything else is OK is----------MORE POWDER!!!
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Offline Sourdough

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Re: Vertical Stringing
« Reply #3 on: March 30, 2008, 07:14:04 PM »
Three shots then let it cool.  Period.
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Offline LaOtto222

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Re: Vertical Stringing
« Reply #4 on: March 31, 2008, 12:01:59 AM »
Welcome aboard. There are several things it could be. Read the FAQ through thoroughly, there is lots of good information here. Some of it deals with vertical stringing. Just for starters, make sure the latch and lug are oil free. Snap the action shut firmly every time you close it. Pull the trigger back all the way and hold it there for a second or so after the shot. When I release the trigger after the shot, I can hear it snap as the transfer bar falls down below the trigger. Try to be as consistent as you can. Consistency will fix a lot of problems, so be as consistent as possible from one shot to the next. When I say consistency, I am talking about how much pressure you are putting on the gun and where. If you are pulling it tight into your shoulder, do the same each time you pull the trigger. If you have a tight grip on the stock, do it every time. Many bench rest shooters, shoot free recoil, to take out this human factor, but the main thing is to be in the same position with the same pressure each time you pull the trigger. Usually, humans factor in horizontal stringing, but not always. Make sure you are not heating the barrel be tween shots. Try shooting with your fore end off and the front rest under the frame. If it shoots better with the fore end off, then you have a fore end issue. These are a few things to watch or try. If you have gone through all of these suggestions, then look at your ammo. If you hand load, powder levels may need adjusted, a different primer may be needed or both.
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Offline hotburn76

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Re: Vertical Stringing
« Reply #5 on: March 31, 2008, 05:25:45 PM »
Quote from: quickdtoo on March 30, 2008, 03:14:14 PM
Welcome aboard see the Handi Basics 101.   ;)

Tim

What is in the Handi Basics about this that I am missing.  Reason I ask is I had the same problem.   Had some loads worked up for my 204 and made it to the range today.  Had a couple that looked pretty good, but had a little wind and would like to go back with a few loads and try again.  But the my last two loads, that where also on the top end of the load spec ended up being vertically strung.  I would think that as consistent as both of these are with being vertically in line does this tell me something?  None of the other five loads did this.  I was shooting off of a lead sled on a concrete bench and felt pretty good with all my shots.  Just thought this looked like it should mean something.  Any of you guys have an idea?  Also, this is 100 yard shots.  The Crony also had all the shots within 50 FPS of each other.  At the most the barrel was warm, but not very warm at all, just able to notice it a little with a bare hand.





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Offline quickdtoo

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Re: Vertical Stringing
« Reply #6 on: March 31, 2008, 05:32:11 PM »
Take your pick, every one these may cause stringing/and or accuracy issues.

Tim


1. Trigger pull must be all the way to the rear, don't release it at the break, or the transfer bar will drop out of place and inconsistent pin strikes will occur. 

2. Close the action with some force, when new this is extremely important, the latch and latch shelf need to mate and that doesn't happen real fast, takes some open and close cycles for the parts to get used to each other.

3. Place the front rest just ahead of the trigger guard under the hinge, if you push the guard right into the front rest, it will be in the same position each time. On my rest, the rear sling stud is also against the rear rest.

5. If you want to find out if the forend is affecting accuracy, remove the forend and shoot it, just slip it back on to reload and remove it again to shoot. If the forend needs work, it will shoot good without it.

6. Take your time shooting, most Handis don't shoot the best groups when the barrel is hot, specially without some forend work.

7.  Always make sure the latch and latch shelf are dry, this is especially important if you clean at the range, it's real easy to get solvent on the latch shelf since it's directly below the chamber.





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Offline ro

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Re: Vertical Stringing
« Reply #7 on: March 31, 2008, 07:30:06 PM »
pigkiller welcome to gbo, i had a 243 handi-rifle a few years ago that did the same thing, the first two-three shots were good, but the next ones would walk up the target, i took the forearm off and it stopped walking-up, i did some work on the inside of the wood put in a rubber spacer that fixed it, you may try shooting it without the forearm on and see if it still walks up, good luck with your handi.
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Offline MOGLEY

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Re: Vertical Stringing
« Reply #8 on: April 02, 2008, 02:31:15 PM »
Float the forend. thin washer in the forend screw hole if it looks like you have the forend evenly routed out and it still hits. Probably what your rifle barrel is most quilty of for doing this is....... being too clean!!
I have a 223, 243 and 204. After I clean the barrel, the first shot may not even hit the  8 1/2 x 11 target! The second will way high , the third within an inch and by the fourth shot, I am in the zone. This does not happen once but every time I clean the barrel (s). I am surmising the barrel is to 'slick' to effectively spin the bullet despite me drying it out with dry patches. I just know that it does it and go from there. I can shoot  a lot before I notice any accuracy issues from a dirty barrel. Don't expect superb accuracy until there are a few hundred rounds thru it. Have fun blasting away until then.

Your pictures you posted look just like what I am talking about to a t.
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Offline hellacatcher

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Re: Vertical Stringing
« Reply #9 on: April 03, 2008, 01:35:12 AM »
A few years ago had a 22 hornet that would string no matter what I tried nothing helped. So finely gave up on it.
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