How to calibrate an Airgun? (Crosman 2100)?

Question

Anyone know how to calibrate an airgun without any special kit , just like using stuff you can find in a average house

Thanks

Answer 1

"Calibrate" = To determine the caliber of -

The only caliber that I can find the Crosman 2100 made in is .177 - it will shoot either .177 pellets, or BB's

To make absolutely sure the easiest way would be to check(attempt to load) with .177 , .20 , .22 and .25 pellets .

There are ways to determine the caliber of a rifle if it's unknown. The process to do so is pretty complex and involves blocking the barrel and liquid lead>etc! >This is not a process to be attempted by a novice.

to take a look at the specs of a Crosman 2100
http://www.airgunwarehouseinc.com
http://www.pyramidair.com

Answer 2

Perhaps you could use a household weigh scale to safely shoot at and then look up a ratio for it online, however, this is extremely unlikely and would be extremely inaccurate.
Know a friend with a radar gun maybe you could then calculate it to fps feet per second?
Know any paintpall dealers in your area might even check for free.
They sell hand held kits for around 25 dollars much safer way to travel.