Answer depends on which cartridge is being fired, and from what gun. In GENERAL, the 22LR is ABOUT 1400-1500 feet per second. The .243, ABOUT 2900 FPS.
243
No. This is a .22 caliber vs .243 caliber (.243 being a 6mm).
3-5 miles
25 is faster.
It MAY shoot. It will not shoot well. It may not shoot safely. The .243 is a necked down .308 cartridge. You are sending a .24 bullet rattling down a .30 barrel. It may or may not trap enough gas to cycle an autoloader. It WILL blow out the case mouth.
No, you cannot, and attempting to do such would be extremely dangerous.
243
It is: 508 minus 243 = 265 greater than 243
It rotates on its axis in about 243 Earth days. That's the slowest rotation time.
I have a remington 243 I shoot the silvertip winchester 95gr or 100gr i am only 13 years old and i killed more deer then i have missed so i recemended a remington 710 model
Size of the rifle will vary, depending on make/ model. The 30-30 BULLET is larger in diameter and weight than the .243, but has less energy. This is due to a slower bullet.
Hell no. .410 is not a gauge it is a caliber. True gauge is a measurement of the number of lead balls of bore diameter that constitute a pound. The .243 bullet is a lot smaller than the diameter of a .410 barrel. There are some .410's that can shoot 45 colts but not all can.