Not exactly what I wanted!

[shooter177]

I have a ne 260rem that I have done a ladder test for, and found a promising load, so I loaded up 10 rounds at what looked to be a good load and I ended up with 2 targets tha look like this!
123lapua in lapua brass with h4350, and a cci br2 primer
Test was shot at 200y

What to do now?

 

[shooter177]

Both are 5 round groups

 

[Stephen1546]

Are those at 200yds? If so, you are shooting 1/2 MOA and I would say don't change anything.

 

[FTRRookie]

Looks pretty reasonable to me for 200y!

 

[dfarrell]

I agree. 1/2 MOA is pretty good.

 

[shooter177]

Yea I agree 1/2 moa is good but the vertical is what is bothering me? I will continue to do some further tests!

 

[Jamie]

how many grs of powder? and what barrel length?

 

[shooter177]

44.1, h4350 26 inch broughten 8 twist from the pimp

 

[FTRRookie]

Inconsistent neck tension?

 

[Jamie]

i would try the 4831sc in the longer barrel trust me do it
I run it in the long 260

and 4351 in my short 260

 

[6mm Shooter]

Are you shooting off a rest or bipod? If you are using a rest make sure the rifle is returning to the same place for each shot and try to get the rest as far forward as possible.

 

[Captain Chaos]

Could the barrel be heating up?

What happens when you put 10+ targets on the same target?

 

[Jamie]

Could the barrel be heating up?

What happens when you put 10+ targets on the same target?

my barrel is the same as at OP's cold/bore (not clean) is the same poi as 10rds fired

 

[Captain Chaos]

Interesting, beyond me then. Must be something to do with the load unless there is something acting on the barrel as it warms.

 

[shooter177]

I was shooting off a bi pod, and I shot one round and would let cool for 2 min then shoot the next round also the cold bore shot is in the first group, this is never fired brass so I will know better when I get the second firing out if the brass! Thanks for the sugestions guys!!

 

[Mystic Precision]

My website has load tuning articles that can help.

In the Tech section.

Jerry

 

[coyote]

44.1, h4350 26 inch broughten 8 twist from the pimp

A bit more info would go a long way .
What kind of gun is it and is this a prechambered with a barrel nut?

If it is what is stamped on the barrel does it have a tight neck ,maybe you need to turn the necks a bit.


Edited I just read some of your past posts and see it was done by Sean the 260 reamer he used on some prechambereds that I know of was not a saami spec reamer it had a tighter neck.

Contact Sean and find out what you have for a neck diameter and turn your brass accordingly cause it wont shoot if the necks are to tight you will get eratic pressures that will screw up all your groups.