Brenneke KOs in My Gun
Tried out five boxes of KOs through my 870 w/20" cantilever scoped barrel with Modified choke tube (which has yielded great results w/Fed Tactical buck).
As per my usual routine, fired four rounds prone, loaded from stumpy sidesaddle.
At 50 yards, consistent cloverleafs (all rounds touching). Very good.
At 75 yards, groups opened up to 4-6", and about half the rounds showed signs of slight keyholing (most likely from the attached wad -- I'll assume it stays on for the whole trip).
At 100 yards, groups went to around 8-11", with all rounds doing the keyhole thing.
(Oh, and regular German Brennekes ALL keyholed at 100 yards, a real disappointment for stuff that costs 80 cents a bang!)
Normally, Fed and Winchester Foster-type slugs run about 5" at 100 yards from this gun. Which may be particular to Fosters thanks to the Mod tube . . . so what have y'all gotten with the KOs?