What is the most accurate way to find COL for a rifle ?

[Lefty Lawless]

That wasn't expected as a result of touching the lands with your load?

Yeah, but .125 longer seems like a lot

 

[red_zr24x4]

I'm gonna ask why? What kind of accuracy do you currently have? What is your load?rifle?twist?
Some loads like some jump, some loads like some jam.
I did the 10 shot load development test, and called it a day. And my load just flat hammers at 600 yards.

Same here
Played with powder, found the best group
Played with bullets, found the best group
Played with seating depth, found the best group
Savage 10FP in .223, cover a 5 shot group with a dime at 100 yards. Was hitting prairie dogs out 400 + yards

 

[Creedmoor]

My father called that, a Lovelace throat.

Yeah, but .125 longer seems like a lot

Very typical...

 

[bwframe]

I'm not near as experienced as some here.

I used the Hornady comparator factory stuff and ran my .243 at .015 off the lands. My first ladder yielded two different loads with a 1/2" group that I called good. (Best groups I ever shot, period. )

IIRC, I ran 300BLK .030 off the lands, so they'd still fit in the magazine?