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Discussion Starter #1
I have a .300 Weatherby Ultralight. It's really accurate, my best is 1 1/4" Somebody who could shoot could probably do better. I've noticed that after about 6 shots it starts to string up. At about the 10th shot it will be about 8 inches high at 100 yards. That's letting it cool somewhat, not 10 straight shots. It has a very slender barrel contour, stainless, fluted. I've never had a rifle do this before. Is it just because of the slender barrel? After it cools down it shoots right back where it was originally hitting. I use this rifle just for hunting, it's not a rifle I like to sit and shoot all day, but I am concerned if there might be something up with barrel. Thanks...
 

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Joel:

My guess is that the fluting is the culprit. Fluting is a pretty sophisticated process and it can create an imbalance in the barrel so that it stretches unevenly when heated. Most barrelmakers that flute barrels, won't do it to a light tube.I don't think that a high spot in the barrel channel would cause stringing that severe.

Take heart! if the first 3 or 4 go into a round group, you've got nothing to worry about. 3 or 4 300 wby rounds ought to take care of biz. for anything that's not armor plated.
 

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Discussion Starter #3
The last group I shot with this gun was 1". Thats the best group I've ever shot with any rifle. 200 grain swift A-Frames. Just have to put up with the stringing I guess.
 

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Joel B,
  It sounds to me like you are doing great. As long as your first shot from the cool barrel doesn't wander around from one session to another I wouldn't worry about the stringing. You won't be firing a group at game!          IDShooter
 

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Discussion Starter #5
Just got back from the range. Shot a 5 shot group that was 1 1/2"s. The group would have been just shy of an inch had it not been for the 1 "flyer". I also didn't notice the stringing either. The stringing was coming from factory 180 grain Core-Lokt's. Maybe the gun just doesn't like those. Loves the 200 grain bullets. I'm shooting about 5 rounds, then letting it cool while I shoot something else. I sure can't complain about the way it's shooting.
 

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I have had problems with vertical stringing in the past and was told a couple things that were dead on, at least for me.   a warm barrel will usually shoot to a different point of impact, try letting it cool for a full minute between each shot. also vertical stringing could possibly indicate a shooting technique problem, specifically breath control. I tried letting the barrel cool and did some serious work on controling my breathing and my groups tightened up considerably. just a couple of things that worked for me.
 
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