Thank you for the warm welcome. I have been reading LRH for about 2 yrs., like all the info.

[Barrelnut]

Well at that altitude I would think about anything would work well. If you haven't tried it yet, might wanna try the Berger twist rate calculator. Lots of guys use it, especially when they think they might be on the edge of stability.
http://www.bergerbullets.com/twist-rate-calculator/

 

[11Bugles]

Thanks, I'll look at it. I intend to use it as a long range rifle, should I limit my bullet choices to those up to 180gr. because of the twist?

 

[Barrelnut]

should I limit my bullet choices to those up to 180gr. because of the twist?

I don't think so. Seems 200 and 210 bullets should be fine. I ran the Berger 210 VLD thru the calculator at 7000 ft. with a velocity of only 2700 FPS and is says the stability is great.

 

[11Bugles]

I'll be at my bench today to look at it