If you are serious of going to "1200 at least" 155s are not the best choice, nor even close. You should be thinking 215 Berger, 220 SMK, 208 AMax, and similar.
The 155 will get there, but compared to the heavies it's gonna get spanked by the wind.
I've, literally, never said anything about 155s.
As I mentioned in my original post, "I plan on throwing light bullets (
175s), but what do you guys think is the heaviest bullet i could throw with that slow twist, when I want to reach out?"
So, as you can see, I understand the ballistic advantages of heavier bullets. My question is not, "How far can I reach with 155". The question is, "(W)hat do you guys think is the heaviest bullet (I) could throw with (1/13 twist)?"
Since the question was missed, I will try to ask it in a different way:
Given: One Obermyer, 5R, 1/13 twist, 26" barrel, chambered in .300WM
Based on your education and experience, what do you believe is the heaviest projectile that could be fired from this barrel that will maintain stability and consistency out to, at least, 1200 yds?
I'm also not asking about what I can do with a 6.5, I am fully aware of the capabilities.
Thanks for your time and attention.