http://www.poly-choke.us/choke.htm
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Yes
NO,NO,NO,NO do not chance it, I blew a 20 gauge barrel up that had a poly-chokeI would Google PolyChoke and ask them. I think it is o.k. with the choke set on IC or Cylinder, but ask them first.
Yes
Slug barrel
The JC Higgins Model 20 is a well-made firearm. Provided you have it checked by a competent gunsmith, it can handle any standard 12ga 2 3/4" shotshell. If the gun is not choked 'FULL' you should be able to use slugs.
You need to contact Remington for an answer.
You can, but I wouldn't advise it.
Deer slugs are the shotgun shells to use when deer hunting.
Open, you don't want any restriction when shooting slugs because they don't compress like shot will I use an improved cylinder choke.
I would suggest a Winchester or a 30 ought six or a shotgun with deer slugs.
Whatever you can use effectively. Most shotgunners in the US opt for a 12-Gauge, but be a sport and use a .410, with deer slugs.
In states that do not allow the use of a high-power rifle to hunt deer, you may be able to use a shotgun loaded with buckshot or slugs.