Iga Screw In Chokes

[bill210]

THE IGA CHOKES ARE MARKED ON THE CHOKE END WITH A SERIES OF DOTS OR MARKS FOR IDENTIFICATION. MINE ARE 3 MARKS AND FOUR MARKS. DOES ANYONE KNOW WHAT CHOKES THESE DESIGNATE?
mY GUN ALSO HAS A SINGLE TRIGGER BUT IT SEEMS TO HAVE NO INDICATION AS TO HOW TO SELECT WHICH BARREL WILL FIRE FIRST. DOES IT ALWAYS FIRE LEFT THEN RIGHT OR WHAT? ANY INFO WOULD HELP THANKS.
BILL

[sniper58]

I was puttering around in the locker this morning when your question popped into my head.
4 notches indicates IC choke, 3 is Modified choke.
As to which barrel fires first, my o/u fires the bottom barrel first. I think your gun will fire the right barrel first if it's a SxS.

hope this answers your question (finally)

[the rifleman]

Not familiar with the IGA SxS, but many double barrels have a barrel selector that is part of the thumb safety switch. Take a close look, and see if it can be moved side to side as well as up and down. Some Stoeger/IGA models do not have a barrel selector, perhaps yours is one.

If you have removable chokes it should not make any diffference, as you can choose the choke for the barrel that shoots first. Usually the more open choke for the first shot, then the more restricted choke for the second shot.
Keep in mind that the type of ammunition you use will pattern differently, so try it out on a pattern board, to see the real results.

Here is a choke designation chart.

Table 1: Choke constrictions and designations.

Constriction (mm), Constriction (inches), British Designation, European Designation, US Designation
0.00 0.00 Cylinder CL Cyl
0.25 0.01 ¼ ++++ Improved Cyl
0.50 0.02 ½ +++ Modified
0.75 0.03 ¾ ++ Improved Mod
1.00 0.04 Full + Full