I have since traded my 870 for a BPS with Bushnell 4200 2.5-10X. After sighting in, the first slugs I tested were the Rem. Core-Lokt. 4 shots were in 1 ragged hole measuring 1" at 100 yds with the 5th a called flyer about 2 " away. I then adjusted my scope to hit 2.5 " high at 100 yds- the next 3 shots were a 1.4" group( I shot these fairly quickly). Bottom line- the are the best groups I have ever seen or fired out of a shotgun.