My tests with 2 3/4" 12 ga 1 oz slugs show Winchesters as being both
faster and more accurate than Federal or Remington. This was with
Foster type slugs in a short cyl bore barrel. This is consistent with the
results of tests that I have seen in published in the AR and other gun
magazines. A plain bead sight on a short barrel will give a high impact
with slugs and I think that's why the 18" factory 870 barrels come with
a bead mounted on a short ramp.