Have about 250 rounds of this UMC REM 30 ,,,,, 30 remington
Remington .270, 150 grain.
No
Caliber is .243, buy ammo in .243.
It was offered in more than one caliber.
Probably a Remington Model 12 -? depends on barrel, ammo made in 1914.
I assume you mean .35 Remington rifle ammunition vs. standard 30-30 rifle ammo. If so then they are not the same and although they look similar they are not interchangable. I hope this answers your question.
Finding any ammo at this time can be a bit of a challenge but Remington certainly still does make the .270 as does everyone else in addition to the larger reloading companies that also provide it.
Any well stocked gun shop should have some. It is not a common caliber these days, so you may have to look around.
223 Remington.
With civiian ammo, it is the caliber. Military ammo- year made, and where
Depends on what you mean. UMC is a brand of ammo made by Remington. UMC = Union Metallic Cartridge By Remington
On the barrel of most guns produced, the proper caliber/gauge is stamped as well as size/ type. That being said I think the model 16 was a semi-auto .22 caliber, firing a .22 caliber long rifle round.