25 is faster.
243 is used on oily surfaces that can't be cleaned.
71, the difference between the lowest and highest numbers.
The primary difference is the engines. The -203 uses General Electric CF6-80E1A3 engines and the -243 uses Rolls Royce Trent 772B-60 engines.
852
There is little ballistic difference between the two. The .243 will drop about one inch more at 300yards (between 10 and 11 inches) than the 25-06. However the .243 will have a 10 grain advantage in bullet weight. If you are hunting anything bigger than a prairie dog you might want to go with the .243. Otherwise for general varmiting and target shooting the 25-06 will give you an extremely tiny edge.
151 MI/ 243 Km
243 kilometres (or 150.99 miles)
.241, .242, .243
243
The opposite of 243 is -243.
How about: 243 = 243.0
486 - 243 = 243