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First, let me say that IMO, the average shotgunner should not do trigger work, just like the average driver shouldn't do brake work.
The stakes are too high.
Remington says the parameters from the factory are 3.5-6 lbs. Things being what they are these days, betcha there's more 6 pounders than not.
And that's too heavy and probably way too nasty for good slug work.
I had the trigger done on my Slug 870 some decades past. The poundage dropped a little, but more importantly the break cleaned up. Now, it's crisp and just under 4 lbs, IIRC. Groups run about 4 inches at 100 yards with the rifled tube in.
FYI, the trigger on Number 1 is close to that and hasn't been touched since it left Ilion in 1950.
Frankenstein is also unmodified and runs about the same. Number 6 runs 4.25 lbs or so and the 20 gauge runs 5.
The 870TB trap gun I had went 3.75, and was truly sweet.
A light, clean trigger makes a huge difference.
However, the vertical dispersion may be due to another factor or factors.
Possibilities include, but are not limited to.....
Loose scope, mounts or barrel.
Incompatibility of barrel and that make of slug.
Less than perfect bench technique.
And,sorry to say, flinching. Benching slugs can hurt.
Besides all that, my experience is a LOT of slugs start destabilizing around 100 yards out. The groups mentioned above were tight, but showed keyholing.
HTH....
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