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vertical stringing what causes it??

ttfreestyle

Silver $$ Contributor
ok first trip to the range with my new savage 6 br and seems to be stringing vertical. using new lapua brass and smk 107 ,30 g varget, br4 primers. what gives.
 
Barrel heating. ;)

Different barrels act different, perhaps after a few more rounds down range you'll get to now what yours likes. Or find out what's changing as the barrel heats.
 
Describe the vertical. Is it within groups or progressive as you shoot more rounds? At what range were you shooting? Did you have either a headwind or tailwind? Which Savage model? What was the cartridge OAL?
 
ok, savage 12 F class 6 br, 100 yards very calm wind, 1 thou off the lands at 2.831 ogive, vertical is within the groups which were .510 to .700 five shots. i have another 12 lrpv in 6 br and it shoots .2s to .4s without the stringing. can neck tension be a problem? i am using redding type s bushing dies but these groups were new lapua . thanks again...
 
Did you size the brass prior to loading? Also, bullet variances may have some touching lands and other not at 1 thou off.
 
i did run the expander ball through them before loading the first time. i also shot two groups ten thou off the lands and two groups five thou off with the same results although they didnt group as well as the one thou off. i just read the article by speedy and it refers to front bag being hard can cause this. mine is pretty hard but my other gun shot off it doesnt string upwards. i may soften it up some just to satisfy my curiosity.
 
I have a 12F 6BR, too. It did not shoot particularly well until it was bedded. The fit in the factory stock showed several shiny contact points, none of them near the action screws. It became a very consistent performer after bedding.
 
Before you try all the items mentioned,try going up in the load window! In other words increase or decrease the amount of powder charge,sometimes and increase of a.2-.3 tenths will shrink the group. I use a harrells measure and typically use 53.25 clicks if I see vertical starting to creep in as the day warms up or humidity increase's , I go to 53.50 clicks or 53.75 clicks and the vertical dissappears. Choose the distance off of the lands first pick the setting that shoot's the best then start changing your load and you will see a big difference.
 
also you may try adding weight in the butt end of the stock. In speedys article, an unbalanced gun may cause vertical. I think the Savage f class is 13 lbs without scope or anything else. My Savage f class was very front heavy. Also, mine got more accurate after 200 rounds down the tube. After the 200 rounds, I had to adjust powder weight from 30.4 to 30.2
 
Boogershooter,
Yes they are a volume type measure, I have two of them different models and they are very consistent. I have a chart I made in the book I log all my matches in and I measure and weigh the different powders that I use using an electronic scale in my shop, so if I look at the chart for 8208 53.25 clicks gives me 29.3grs and 53.50 is 29.5grs I have been using these for just over 10 years while I would like to use a RCBS chargemaster I haven't found reason enogh to change over to one. Hope that was helpful.
 
I don't know about 1000 yards shooting but in point blank (100-200) yard BR the well tuned rifle will get vertical when the load is too light and it will spray when the load is too hot. There is a very fine line between tuned and out of tune. The one who said a hard front bag will cause it is also right in many cases. I do not want a hard front bag. Picture, if you will, trying to shoot off of a front rest lined with a 2X4 instead of a sand bag filled bag.
 
Headwinds and tailwinds can also cause vertical dispersion. The attached target was fired at 300 with a very consistent load, RL17 and Berger 210 BT-LRs at 2620. We had a gusting tailwind and the range berms have a profile like a roller coaster. When the wind is from the south; we often see significant vertical, even with high BC bullets like the 210.
 

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FB has it right on this one. A couple other things to think about is the fact that your brass is brand new. after you shoot it the first time i think the groups will start to get a little better. How far is your stock on the front bag? Maybe you should slide your rifle farther forward or backward. that itself can cause vertical. What powder are you using? I would try either varget or RE15 and no others until you have found something you like. How far are you shooting? There is just so many variables. If you would like to send me a pm maybe we can get this figured out. I just went through the same thing with a 30BR. I simply slid the rifle farther forward into the front rest and the vertical improved. Good luck!! Have fun!! Lee
 

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