Little cases with high BC lead bullets at moderate speed work. Little cases with lower BC copper bullets at slightly less moderate speed work less well. When stuck with only copper bullets, a moderate case is less appealing as a one gun solution.
I'm not sure what theory you are referring too, I shoot a 6.5 and some bullets work better at longer ranges than others on Saskatchewan, Manitoba, Alberta whitetail for example.
You said you recommend a 6.5 cm with a bunch of 143 eldx factory over and over and it's what you'd consider as well. That's a great package. Recommending a 6.5cm with 127lrx is less appealing since we all know monos like speed, which the small 6.5s don't have
