1964 Remington 1100, Steel Shot

All Model 11-87, 1100, and 870s are safe to use #1 or smaller with steel shot if they have a full choke and all steel shot sizes if they have a modified or more open choke. This information is from a leaflet that came with an 870 barrel I bought.
 
For decades people used 1100's to hunt everything that can be hunted with a shotgun, and then around the 1980's people decided that 12 gauge Remington 1100's and 1187's were way too heavy to hunt with in the uplands. I only mention this because I actually enjoy my 1100 12 gauge when chasing pheasants.
That being said, it should say on the barrel what the choke is.
As far as readily available steel alternatives, no, at least not at a price that even remotely rivals steel shot.
 
SHOTGUN BARREL ALTERATIONS FOR STEEL SHOT

Forcing Cone Alteration:

Factory shotgun barrels usually have a fairly short and abrupt forcing cone. The forcing cone is the tapered area just ahead of the chamber where the shell is contained. Altering the forcing cone, so it is one and one half or two inches in length, reduces recoil and improves the pattern density. Trap shooters and skeet shooters have been doing this for many years. It is a good benefit to the steel shot user as well.

Choke Alteration:
Choke designation from the tightest to the most open are:
Extra Full, Full, Improved Modified, Modified, Skeet II, Improved Cylinder, Skeet I, and Cylinder Bore.

Steel shot does not require the constriction that lead shot needs, to produce good patterns. In fact too much constriction, causes poor, erratic patterns, and in some cases, permanently damages the barrel. I have seen barrels bulged at the choke, I have seen barrels where the choke split right open, from using steel shot.

For steel shot, with thin barrels, chokes should be altered to at least Skeet II. Often, over & under, and side-by-side shotguns, are best altered to Skeet I and Skeet II chokes. Heavier barrels can be left at Modified choke but may see an improvement in the pattern if opened slightly.
 
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