Current production would be on the web sight. There is also information on discontinued rifle designations. Pretty much all the calibers that have loaded ammunition available for them, including all the Remington Developed cartridges. This is especially true after the introduction of Saami specs.
.17, .221, 220 Swift, .22-250, .222, .223, .243, .257 Roberts, .25-06, 250 Savage, 6mmRem, 260 Remington, 6mmRem Benchrest, .270, 270 Rem Magnum. 7mm Magnum, 284, 300 Savage, .308, .30-06, and then a slew of bigger and belted cartridges. I am sure guys on here can add to the list.
Add to the Remington Custom Shop and there have been non-traditional calibers offered.