One of my mates goes to the trouble, but whether he benefits from it, I have no idea.
For shooting goats and deer in open country the .243 Winchester is an excellent Model Seven chambering.
The .284 Winchester has a larger powder capacity than the smaller 7mm-08.
The gunsmith may have to open up the action rails and feed ramp, but nothing else needs to be done.
I rate the Nosler Accubond as being one of the best controlled expanding bullets available.
I reviewed one and it surprised me how precisely it tracked when I shot the square with it. Variable scope technology has come a long way.
The .25 Souper is based on a necked down .308 Winchester case and ballistics should equal the .257 Roberts.
As for 3-shot groups, unless I already knew that rifle, I'd base nothing on a 3-shot group.
The Redding Ultra Mag is unconventional using a long-link compound-leverage system.
It is based on the .25-35 necked down to .228 calibre - the first truly smallbore high-pressure cartridge.
Where extraction becomes tight, you should back off at least 2 grains of powder.
Most barrels chambered for the .303 Savage are .308" groove diameter but some are as large as .310" requiring the use of .311" bullets.