You will gain a TON of case capacity by seating your bullets out farther.
He'll pretty much have a .300 Win Mag, no doubt.
All kidding aside, too many things in this thread to address in one reply, but I'll try. Not a 6.5 fan as it doesn't really have the varmint weight options, and for heavier game, I'd much rather just have a 7x57. But then again, anything big I'd use the 7x57 on, I'll use the .375 on. I was worried about BC's until I ran the trajectories, the .257 'Bob is no slouch, more than 3,300fps no issue with the 90gr Banded Solid at 'Bob pressures, guys are hitting 3,500 at 90gr comfortably as well but that might be warmer than I'd like. Makes up for the low .300's BC, and I don't forsee shooting furbearers at more than 400 yards, so the BC is near moot with that launch speed.
Seeing as I have a medium big game rifle I really like and use across the board, the .375, I really needed a light end of big game and varmint rifle that's reasonably light in weight too. I shoot gophers and crows, and the 75gr V-Max will be fun for that as well. Was looking for a 500 yard reach rifle with enough bullet weight for animals up to Sheep, the 'Bob arrives at 500 yards with 1,000ft-lbs and 2,000fps in its warmer / modern action loadings, and suits the purposes just swell. If I want more, I'll just AI it, as people have mentioned here, but for what I want the standard +P 'Bob will work nicely I'm sure.
I also have two other .25's and have a lot of bullets on the shelf.

Plus, it's a custom rifle, if I don't like it (I'm sure I will), I'll just rebarrel it, barrels are something around 5% of the total cost of the build. bearkilr, yep I sure could have gone with a Montana, but I had a Kimber Classic Stainless .308 and while I liked it, it was far from my dream rifle. I like a heavier barrel, and while I save weight in the action (the Satterlee Ti weighs 20oz, if memory serves) I want to put that weight back into the barrel, so instead of the possible 5lb gun I'll likely have a 6 1/2lb rifle with a reasonable barrel on it (heavy sporter contour Krieger). I'm not an ultralight rifle fiend either, even 8lbs is still plenty comfortable I find in the hills, so this should be truly a pleasure.
Of course, I could rebarrel a Kimber to any chambering of my choice in any barrel weight. But in the end it's not really about that, I've added $2,000 or so of options past the base Satterlee Ti action, this will truly be my action, made exactly my way, with no compromises and ultimately, my rifle of the same vein. Never owned a no compromises rifle, and look forward to it. And, I have to admit, I'm swayed like most of us by nice guns, and three-quarters of the reason I ordered it has to do with factors other than base performance. I could have a new double rifle, and a good one, for the ultimate price of the build but I'll use this a lot more- it's totally weatherproof (will seal the stock as well), light, handy, and accurate at any hunting range. Everything a double rifle isn't really.

So it's my double rifle that's not a double rifle if that makes sense. I've been shopping Krieghoff and Heym doubles for awhile, coming to the ultimate realization that if I buy a $10,000+ rifle, it better get hunted every year! I'd truly 'use' that double maybe once every five years, if
really fortunate. Plus, I have two doubles to finish, one a classic .475 on a WW Greener frame and need to keep the motivation to get it hunt ready.
A nice light little .257 'Bob will get used monthly, going by how I use my rifles just at present even. Looks more and more justifiable as I look at it that way. .257's plenty classic, and has a nice American flavour, something my cabinet's been lacking in years of late. Barnes opening up the options for it has really done it, four good big game bullets and a slew of varmint options, sold. Did I miss anything and defend my viewpoint sufficiently?
