Many custom and commercial companies.
Mine was made by Remington.
899.00
Check out the gunbroker.com You should be able to find what you are looking for.
No, the 300 ultra mag cartidge is not interchangeable with the 300 win mag.
The 7mm Ultra Mag is a Remington cartridge. THE model 70 is a Winchester rifle. Winchester does not chamber the Model 70 For the 7mm Rem. Ultra Mag cartridge.
100-800 USD
100-800 or so
Basically the case is all. Same caliber bullet, but the case is shorter in the ultra mag. Its basically just a smaller round, bigger punch.
375,000 yards
100-1000 usd
30/06 is one
That serial number dates to 1953, however the 338 Win Mag was not introduced unitl 1958. Looks like it has had the barrel replaced.
Depends on bullet weight, muzzle velocity and barrel length.