The .500 requires a magnum bolt face so the CZ550 African--a Mauser action--would be the cheapest way to go
except that being a straight walled rimmed cartridge it doesn't lend itself to0, too well to bolt actions--which is why you've always seen them in double rifles since the added weight helps hold recoil down.
570 gr @ 2,150 ft/s velocity with 5,850 ft/lbs energy
Also it's a big, fat case:
Bullet diameter .510 in (13.0 mm)
Neck diameter .535 in (13.6 mm)
Base diameter .580 in (14.7 mm)
Rim diameter .660 in (16.8 mm)
Case length 3.01 in (76 mm)
Overall length 3.68 in (93 mm)
Case capacity 138 gr water
If you did it on a single shot, then mercury tubes and a very dedicated stock design with a great recoil pad would be required but the only action that I know of that would take that is the
Martini & Hagn since they have one displayed on their website...BUT it isn't a $1,000 action.
Gary Reeder made up a Ruger #1 in
NE type calibres called the Mega Beast using .577 Snider brass and again you're looking at a $2,500 conversion using your own supplied $1,200 tropical rifle.
I shoot my uncles a few times a year and he my .470 NE and .476 WR.
For bolt actions why not get yourself a .505 Gibbs
525 gr @ 2,300 ft/s velocity and 6,180 ft/lbs energy
600 gr @ 2,100 ft/s velocity and 5,877 ft/lbs energy
Bullet diameter .505 in
Neck diameter .538 in
Shoulder diameter .600 in
Base diameter .640 in
Case length 3.150 in
Overall length 3.850 in
Case capacity 178 gr water
or a .500 Jeffrey or the 12.7x70 mm Schuler
Max Overall Length: 3.500 in.
Case Capacity: 143.7 gr. water
Don't have case dimensions
570 gr @ 2,200 ft/s velocity and 6,127 ft/lbs energy
Ryan Breeding builds some amazing big bores bolt jobs.
You may want to check out:
Nitro Express Forum