Unless you have tested your gun with slugs, I sincerely hope you intend to keep your shots well under 100 yards. 50 is a lot more like it, and then only with the right loads. A shotgun, any shotgun, is a short range weapon.
For sure you can effectively get to 100 yards with a shotgun slug. Like many firearms, you have to find the ammunition/load that works best. I have seen 200 yard shots on coyote sized target repeated over and over - that is pushing the effective limit which is around 100 yards.
Get the slugs with most. Velocity so recoil doesn't have much effect on ur poi.you can get the hornady set 12 Ga slug for 13$ box. A 500 slug barrel should be under 130$ or just get a short turkey barrel and buy a rifled choke
The issue with using slugs from the Mossy, quite frankly, isn't the ammo or the gun. It's the shooter.
Slugs are powerful enough for just about anything you'll hunt in this country. Yes, they will work at 100 yards.
Seeing, though, as the basic Mossy has only a front bead sight.....how well can you shoot it at 100 yards?
Unless you are going to scope the gun, even fifty is a lot under field conditions.
if you are going to stay with the smooth bore, Brenneke K.O. slugs are very effective.
With a 12 ga. you're set for almost anything from a power standpoint. I would suggest getting a shorter barrel for turkey and deer or a rifled barrel for big game. You should have different chokes depending on your load and what you're hunting. Hope this helps.
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