The diameter. A .41 cal is about 41/100ths of an inch, and a .44 cal about .44/100ths of an inch, In real life, the measurements may be slightly different, but in general, the .44 cal is larger.
Typically, 20-30 grains. Depends on the bullet/ ball you are using. Contact the maker, get a copy of the owner's manual, follow instructions.
Barrel marking, chamber cast.
Xx
Can't be answered as asked.
What's the question? Could you rephrase it?
50-100 USD
50-1500 usd
10-1000 USD depending on the specifics
50-550 usd
You might try here: http://www.coltparts.com/index.html
100-400 or so
Would need to see pictures and the serial number