Mine did fairly well at 50 yards and was 2 inches high just like they suggest. I moved back to 100 yards and the next shot was about 4 or 5 inches high? Come to find out the gun does not group that well at 100 yards with this ammo. Maybe 4 inches or so, and most of the shots were high.
Paul there is no reason that should be occuring with the Lightfields,(although I have heard others with the same results). Usually the problem results from two issues, shooting position, and rest.
First, I would not use the bi-pod for sighting in the gun. If don't plan on hunting with it, don't sight in with it.
Second, using the bi-pod while sighting is most likely causing the gun to bounce as you are not shooting off a soft rest. A reasonably soft rest is critical when trying to establish a "true" POI with a shotgun due to its increased recoil.
Third, make sure you are firmly holding the forearm down and pulling slightly backwards into your shooting position. This is once again key to reducing muzzle jump.
Remember sighting in a slug gun requires a different shooting technique from the rest. It is not the same as sighting in a rifle due to the extremely heavy recoil and relatively slow velocity of the slugs........
Here is separate piece on popular slugs I had posted elswhere that may be helpful as well...
There seems to be three or four favorites that will shoot in any gun. Ideally you get lucky and the one with the best ballistics performance also happens to give your gun the best accuracy.
The top four are:
Winchester Partition gold
Lightfield Hybrid Exp
Remmington Copper Solid
Remmington Core Lokts
In terms of down range performance, they rank from best to worst:
1).Remington Core Lokt Ultra's/ Winchester Partitions
2).Remington Copper solids
3).Lightfields Exp
To give an idea of how far behind the Core Lokts/Partions the Lightfields are think about this fact.
12 ga Remington Core Lokt sighted 2 in high at 50 yds = 0 inches at 150 yds
12 ga Lightfield Exp sighted 2 in high at 50 yds = -9.7 inches at 150 yds