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870 compact diagnosis

Started by nyhunter, April 21, 2020, 05:57:44 PM

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nyhunter

I was patterning a 20ga 870 compact  gun yesterday with 3" 1.5oz Fed. HW #7's and a Sum toy 562.5 and a Trulock Fed. HW .560 choke,  first shot was really nice pattern 167 in a 10" at 40yds,  the next 3 shots completely blew the center of the pattern out . Trulock choke did 150 but same thing .  you could plainly see all the pellets around the center with a large hole in the middle.   For the record I was shooting at a 36x36 piece of paper "new" for each shot, I dry brushed and run a dry patch down the barrel between each shot.
So my question is what do you think the problem is?   

P,S I did deep clean the barrel as per Clark Bush'es guide lines when i got it.  I will say this the tooling in the barrel is terrible it looks like a washboard dirt road. 

LRD

I would try shooting it 3 times without brushing in between. It doesn't make sense why the center would blow out, but some guns shoot better with a dirty barrel.