Each weapon will exhibit a preference for a certain maker/load combination. The only way to know is to shoot as many different loads as you can find.
Assuming you mean the Remington 870 shotgun, with a scope- is your barrel rifled? If so, sabot slugs are generally the most accurate. If smoothbore, then rifled slugs will be most accurate.
Depends on what it is choked.
yes tou can
Not recommended for full choke
12, 16, 20, 28 gauge, or .410 bore, depending on what it is chambered for.
Yes you can, I own a Remington 870 wingmaster with a 27" smoothbore barrel and it shoots rifled 1oz slugs all day, and fairly accurately. The only thing you cannot shoot through it is sabbot slugs but the nice thing about having a gun like yours is that you can go from slugs to 00 buck shot to bird shot without changing barrels. Good luck and happy shooting
NO
with the wingmaster barrel you can only shoot lead, but if you change the barrel to a slugster you can shoot slugs and buckshot, they also have a barrel for steel shot to.
Yes: A Remington 870 shotgun with a modified choke will shoot any commercial shotgun slug.
Remington does not show a 870 rifle on their web site. Do you mean the 870 Shotgun? the Remington 870 is one of the most popular shotguns in the us. this shotgun ranges from $300 for the basic model to $1000 for the fancy Wingmaster edition
No
Yes.