Is it chambered for magnum shells? If not, the answer is NO.
The barrel should be stamped with the applicable shells that can be shot through the gun. i.e.-( chambered for 2 3/4" and 3" loads)
Loads that carry more shot and powder.
Not recommended.
Yes, they are all high brass and considered magnum loads
Depending on the gr/ the harder you squeeze the more speed the bullet travels(lol)/
With the right loads and choke, yes
Find a good gunsmith.
There is no one answer. Try different loads and see which ones you are competent with then do penetration tests.
Occasionally there will be a 10 Gauge shotgun for sale in your local sporting goods shop -if you don't see one, ask the clerk for a catalog- or possibly a pawn shop. If you are lucky, you may find an ol' double-barreled 10-Gauge, but some of them have "Damascus twist" barrels and can't handle modern loads.
The gun is probably set for heavy loads with the friction rings, and the loads are too light. Remove the forend. Inside the wood forearm may be a diagram to show how the bevels and brass friction ring should be set for light vs heavy loads. If no diagram, go to Browning .com and there you can find a diagram, but remember to find the Mag 12, it is different from a standard A-5. When shooting heavy 3" loads, set the rings to heavy. When shooting 2 3/4 lighter loads set for light.
NO. You clean a barrel with a cleaning kit. Magnum loads are fired only in arms designed for them.
The J C Higgins model 20 pump shotgun is one of the finest pump shitgun out their made from 1947 to 1962 two and three quarter inch 12 gauge game loads no 6 shot have always worked well for me. I prefer federal ammunition or Winchester that's your choice
Yes.In all modern shells, the shot is packed in a plastic wad which keeps the shot in a tight group as it travels down the barrel. The shot never actually touches the sides of the barrel.So long as you don't try running magnum loads thru a gun that isn't rated for them, you won't have a problem.