You are not going to get 300 yards in a slug gun, especially not a smoothbore shotgun like that. I'd say 75, maybe 100 yards max for that gun.
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Maybe 200yd with expensive sabot slugs and a rifled bore . Plan on 75yd with most shotguns.
Thanks for the info. I'm definitely new to shotguns. I knew my only interest was in using slugs, I'm still going to pick one of these up, however I'm rethinking for what purpose aside from range fun. The closest I've ever dropped a dear was close to 400 yards with a .308. Maybe I'm hoping for too much out of a nice scoped 12g. Anyway, we'll see.
Yeah, they're just too heavy and slow to get any decent range out of them (which is why the more populated areas of the state require them since they theoretically would travel less if you miss).
Your best bet for range is a dedicated rifled slug gun (H&R UltraSlugHunter, Browning A-Bolt, and, as I mentioned, the Ithaca Deerslayer). Those guns are purpose built to get the maximum range and accuracy possible out of a shotgun. With a rifled barrel, they're designed to be used with sabot slugs. Sabot slugs have a plastic sabot around the slug, which engages the rifling of the shotgun barrel to impart spin.
The biggest downside is the cost. The guns are expensive. The ammo is expensive (~$3-$5 per round). All for a gun you're going to use 2 weeks per year at most (6 if you hunt the late doe only season). Shooting shot out of a rifled barrel shotgun won't get you a very useful pattern. You can get a smoothbore shotgun and a separate rifled barrel, but you won't get quite as much accuracy as a dedicated gun. You might be able to hit 200 yards if you find the right gun and ammo combo (which, in itself, is expensive since the ammo that works well in a particular gun can vary).
Then consider the fact that what comes out the end of a rifled barrel shotgun is basically a muzzleloading bullet that you would use in a modern muzzleloader.