Doesn't your slug barrel have open sights on it? Why not use those? Should be good to 75, probably 100 yards for deer.
It's a rifled barrel with the scope on a cantilever. I used an a adjustable padded rest. Started at 50 yards then moved out to 100. I was shooting sabots. I'd say the group was about 4-5 in. Then a couple weeks later, same range, same distance. Only difference was less wind the second time. This time it was shooting high, off the paper. Im just looking for it to be in the vitals every time.
Three things....
1. How much difference in wind?
2. Did you change out barrels in between sessions?
3. Everything tight on scope mountings?
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RE: # 2..... But, did you swap it out for the field barrel and put the slug barrel back on?1. Probably about 10 mphish, but what threw me off was that it was shooting high, not off left or right.
2. Nope, same barrel.
3. Yes, as far as I remember (I had already made that mistake once before. )
RE: # 2..... But, did you swap it out for the field barrel and put the slug barrel back on?
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My Mossberg 500 combo rifled barrel will hold 3" 3shot groups at 100 yds all day with Remington accutips or copper solid. Hornady will hold 8" groups. Expensive Federals will not hold 36".
My Winchester 1300 rifled barrel did not like Sabots of any flavor. I does like 3"Rem rifled slugs for some reason. 1.5 MOA at 100 yards.
The SBII loves the Accutips and Copper solid sabots and is more accurate than the 1300.
As you can see from the above, shotguns are oftentimes just like rifles. Some will shoot certain loads better than others. I'd try as big a variety as possible. Nothing wrong with Hornady slugs; your gun just might not "like" them. Much easier and cheaper to have one gun and find a load it likes than having one load and trying to find a shotgun that likes them.
As mentioned by others, I'd be inclined to upgrade your scope too. Even if it is working fine now, shotgun recoil is pretty fierce. A slug gun is NOT the place for cheap optics. Then check to make sure your mount and rings are tightened correctly; your barrel tightened to the receiver. Finally, test your multiple different loads to see which your Mossy likes.