Little late to the party I will offer up three choice:
6.5 x 270 JDJ:
15-inch stainless with SSKs fish gill brake & Tsob base.
Burris 3 x 12 hand gun scope: The recoil is so mild you can spot hits in the scope.
Ballistics:
100s I am working with these now touching 3000fs
120s are at their best at 2800fs
125s & 130s at 2700fs - I do not have anything heavier than 130gr.

7 x 57 Improved 40 degree:
I am a big fan the 284 caliber have taken several Indiana whitetails with this one.
16-inch CM matte finish with SSK arrestor brake & Tsob base
Burris 3 x 12 hand gun scope: Recoil is mild
Ballistics:
120s at 2950fs Used Sierra 120 Pro-hunter with outstanding terminal performance
140s at 2800fs
150s at 2700fs

280 JDJ:
15-inch stainless with SSK fish gill brake & Tsob base
Burris 3 x 12 hand gun scope: Recoil is mild
Ballistics:
120s will touch 3000fs
140s best at 2800fs
To date I have not tried any weights heavier than 140s.
Late last fall I tried a Burris Full Field II 4 x 12 x 42 rifle scope to see if I would like it. (No) I returned to the handgun scope. The rifle scope was not advantageous to my shooting \ hunting style.

Of course, all of these are wildcat roll your own options.

Good luck with your choice
D..