300wm

[Biggs300]

I use 180 grain Nosler Partitions for everything that I hunt with my 300 WM. So far, that has been deer, elk and hogs. I've tried Nosler AB's and a couple of other factory rounds before I finally settled on the NP. It is the bullet that I now handload and it is the one my X-Bolt like the best.

 

[belly-deep]

The horizontal string is caused by trigger pull (my opinion) not being consistent.

Could be wind too

 

[406LIFE]

The horizontal string is caused by trigger pull (my opinion) not being consistent.

That's what I meant. L to R impacts are trigger control.

 

[mtmuley]

Seating depth might cause it. Have someone else fire a few groups. That will eliminate shooter error by you, if any. mtmuley

 

[old man]

Could also be heating barrel.