Building a slug gun

Old Spice

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Ok so I have this plan of building a dedicated slug gun

What I picked up is an older 870 express magnum that came with the 28 ribbed barrel and a 20 inch rifled barrel.

I have since picked up a mesa tactical stock and 20 inch rail with 6 shell holder

Any true advantages to a rifled barrel?
Can you fire rifled slugs out of said barrel without affecting accuracy or is only good for the non rifled style.

Also will shooting buckshot/birdshot harm the barrel in any fashion? I know it will expand the shot alot faster vs smooth bore

Be nice to know what to expect with a rifled barrel or if I should just find a 18-20 inch smooth bore..

Pro and cons of either

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Rifled barrels are excellent with the right slugs, I cast my own and the wad/slug combo become very much like a factory shotgun sabot round. If you don't make your own you can buy shotgun sabot slugs (expensive) which will provide excellent 100+ yard accuracy. 'Rifled' slugs are designed for normal non rifled shotgun barrels. Lead shot won't harm any barrel, accuracy may not be great in a rifled barrel, likely less than a smooth bore and certainly less than a choked barrel.
You have to ask yourself what your main use of the shotgun will be, if it's for longer range slug accuracy, then use a rifled barrel, everything else use a non rifled barrel.
 
Rifled barrels are excellent with the right slugs, I cast my own and the wad/slug combo become very much like a factory shotgun sabot round. If you don't make your own you can buy shotgun sabot slugs (expensive) which will provide excellent 100+ yard accuracy. 'Rifled' slugs are designed for normal non rifled shotgun barrels. Lead shot won't harm any barrel, accuracy may not be great in a rifled barrel, likely less than a smooth bore and certainly less than a choked barrel.
You have to ask yourself what your main use of the shotgun will be, if it's for longer range slug accuracy, then use a rifled barrel, everything else use a non rifled barrel.

Ok good to know.

And main use is just for fun and at the range be nice to have a fairly accurate shotgun for slugs.

I have the semi's and tacticool pumps blah blah just want to try something new and have never played with a rifled shotgun before.

And thanks I was drawing a blank on sabot slugs I was going to call them foster but thats the normal style.

As for the base shotun a rem 870 express is ok to build from?
 
Realistically the rifled barrel will be best with sabots, as you said already shot pattern out of a rifled barrel will spread more exaggerated. I see no harm in seeing how foster slugs will shoot out of it as well as buck and bird shot, you will see a big price difference with fosters and sabots so getting a 18-20” barrel with chokes might be more useful in the long run. Although I know the 2 /34” challenger slugs say for use in smooth and rifled barrels or any choke constriction on the box.

What is the intended use of said slug gun for you, hunting critters or just shooting slugs at the range etc?
 
They shoot really well in my 870 20” smooth barrel with a mod choke, haven’t tried them in my 23” rifled barrel yet. Price is a lot nicer when you compare 10 of these to 5 sabots as well.

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Firing bird shot from a rifled barrel will not only spread the shot out quicker it will also have a very weak centre. Rifling spins the shot pattern away from centre basically getting a ring around your target. I have tried a 12 and a 20 and the centre is very thin.
I have also made up shot loads for 41 ,44,45 revolvers the same thing happens basically a ring with a few pellets in the middle.
I would push my slug reloads past 100 in my rifled barrel.
 
I'd keep your stocks like they are currently instead of putting on that telescoping stock. Your cheek will thank you.
 
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