Re: jlk 140gr
I have not run that bullet yet, but the 175 and 180 long boat tails in 30 cal did exactly as advertised. They're a very consistent, high quality bullet.
I have no reason not to trust Bryan's evaluation of the ballistics, and all the reviews of JLK bullets are that they are extremely high quality bullets.
If you call, Swampy will send you a sample size large enough to work a load up and see how they work in your rifle, it's not free of course, but compared to buying 300 bullets to find out they suck it's a good deal.
I'd be surprised if you were disappointed. I plan to buy a sizable quantity of his 180gr 7mm bullet soon.