help with vertical. Pics up.

[skeetlee]

Today Mason and myself went down to the 500 yard range. We were shooting some steel plates and some groups trying out different loads. I decided i would shoot a 500 yard group to see how this particular load would do. I havent gotten the chance to shoot this load at 100 yet so i didnt know what to expect. Wind wasnt bad but the mirage was. I was doing my best to shoot to condition. I was pretty pleased with what i found after we went down range to look at the targets. I am pretty pleased with this rifle and how it shoots so far. I only have around 75 rounds down the pipe. As you will see 4 out of the 5 shots are stacked up in an almost straight line. What causes vertical like this and is there anything i can do to help overcome it. Is it a simple as hand measuring each load? I used an rcbs electric powder dispenser for these loads today. The load i shot today is this-
32.2gr RE15
105gr Berger
fed match primer
set 6thou into the lands
6mm dasher 8.5 twist Brux barrel stiller predator action, shehane 1000 yard stock. any ideas would be great. I wish i had more ammo to shoot another group to see if this was a fluke. I would like to think it isn't,but i dont know that for sure! The other marks on the target are from last weekends varmint match. Thanks Lee

 

[skeetlee]

No one has any input on how to get the vertical out?? I need some help!!

Does bedding have much to do with vertical? The stock i was using today was bedded for a rem 700. The stiller action i have seems to fit the bedding like a glove. Maybe there is something i am not seeing?? Lee

 

[expiper]

looks good to me...

How many 500yd groups have u shot.....ooo yea..it aint a world record...but ...there are lots of groups bigger than that shot (dont ask how I know..grin)...you have things close...you just gotta do like every one else and "fiddle with it"...neck tension...seating depth...etc,,,go bak to 100-200 and shoot it some more...dont forget some vertical is from the wind,,and you said the mirage was bad....just keep shootin......Roger

 

[skeetlee]

I am very new to all this benchrest shooting. This is actually my very first 500 yard group, that i have ever shot with any kind of seriousness. I have been playing with rifles for a couple years now and i take great care in my reloads. I am learning all the time, but lots left to learn. I just thought maybe there was a major reason for the vertical in this group. The wind kept switching and i would hold right half a target then back left a half target, and one shot dead on. I was pleased with my wind calling on this one, just concerned with the vertical. Of course i owe a lot to the man who built the rifle. Jon Beanland of Beanland custom rifles is a great rifle builder, and a good friend. His work is outstanding!!! This stuff is great and i know i am making to big a deal over this but this is awesome stuff man!!! Small groups at 500 turns me on!!!!! Thanks Lee

 

[Chisolm]

Lee,
A left to right or right to left wind will also effect vertical on the target.

Attached is a diagram by Speedy Gonzalez that gives an idea of what to expect.
Terrain and obsticals at the range can also have an effect, sometimes causing a verticle component to the wind.

You may also be slightly out of tune. You may try .1 to .2 grains less or more powder if you don't have pressure signs yet. Changing seating depth was already mentioned.
Mirage caused by a warm barrel will cause verticle.
Mirage down range will cause verticle.

I stole the Speedy wind chart off this website some time back.


James

 

[skeetlee]

how accurate is the electric rcbs powder dispenser? I do not have a 10-10 scale to check with. Like i said above i didnt get the chance to shoot these loads over the chrony. I will try to tomorrow if the weather holds. Thanks guys i really appreciate your comments. Lee

 

[Bob Kingsbury]

It would be nearly impossible to bed a stock for one action and substitute
in another action. How it looks is irrelavant. A dial indicator will tell you
a lot more. The causes of verticle in a rifle would make a very long list.
Then we have the range conditions, and finally we have the shooter.
One group also will rarely define a verticle problem.

 

[Wilbur]

That's a good group

If you can shoot the same with any consistency, worry about something else.

Where did those other two shots come from?

 

[Hornetfan]

Run it over a Chrono. Check the SD. A big velo variance will cause vertical at longer ranges. That group at that range I would look there before I would the bedding.