RemRocket762,
I would agree with all the calibers listed but I would have to go against the currect traditional opinion on which caliber to use.
For the receiver you have, I would recommed one of two rounds, either the 6.5-06 AI or the 280 AI.
Simply because they pose zero feeding issues at all with your receiver and would nearly match the ballsitic performance of the WSM rounds and are a fair bit over the 284 wildcats.
Again, current opinions on case design will tell you that teh short fat cases are the most accurate. On paper that may be true but in quality rifles, they all shoot EXTREMELY well.
For your needs, I would recommend the 6.5-06 AI using the 100 gr Ballistic Tips or 95 gr V-Max bullets for moderate range varminting, the 120 gr bullets for deer size game out to 400 yards and the 140 A-Max and 142 gr Wildcat ULD for long range shooting.
The 6.5-06 AI will drive a 140 gr bullet to well over 3000 fps in a 26" barrel which is plenty for extreme range shooting consistancy.
Cheap to load, easy to build, feeds like a dream and will offer 1/4 moa consistancy with top loads.
This would be my pick for a project like yours.
Good Shooting!!
Kirby Allen(50)