You shoot at what is called a "patterning board" to determine the shot density at different distances (assuming that you are shooting shot and not slug). Your best bet is to buy a book. Check out Amazon.com or DBI books.
The Express version of the 870 Remington is normally either 12 or 20 gauge. Gauge desigantion is marked on the barrels left, rear end.
12gauge magazine cap fit on a 2ogauge 870 mag cap
100-400 USD
3
Around 300 dollaroos.
50-250 usd
100-300 or so
In 1950 Remington introduced fifteen versions of the Model 870 shotgun, in 12, 16 and 20 gauges.
50-250 USD or so
it could be any shotgun but my choice is my Remington 870, 20 gauge.
To determine the exact value of a Remington Wingmaster 20 gauge model 870, a few different things would need to be taken into consideration. Some of these things would be the age and condition.
Depends on condition and exact version, but $225-$300 for most.