As some of you may know. I recently bought a a Carlson's long beard choke. When I was testing it I noticed all of my patterns had a few gaps in them but consistently had a large gap right in the center. I tried tweaking with the choke and ended up ruining it.
Well I recently bought a new Carlson's long beard choke, and then having the exact same issue. It's almost like a donut shaped pattern. Is this an indication of to tight a choke and the beginnings of a blown pattern.
Have been using number 4 and number 5 shot but have not tried six.
What gun and more importantly, what shells?
Sounds like you are over choking. I don't know what shells but if it's lead I'd try no 6. I've killed a lot and I mean a lot of toms with no 6 lead. No 6 hevi is also my pick with hevi shot.
Gun is a 28" 870 express
Shooting longbeard #4 and #5 both High Velocity and Magnum. As a side note magnum produces the better pattern with both shells and #5 magnum the best so far, yet unacceptable with a 2-3 inch hole in the middle.
Next time I'm out I'll pick up some #6's
I get better patterns with a .665 choke than I do a .660 choke in my 870 Super Mag using old style Jellyhead choke tubes(or other brand chokes for that matter). Shell brand doesn't really matter, I just get a better pattern with the .665...5's better than 4's or 6's. For me the Longbeard shells are to tight....softball size pattern at 15yd. with the .665 choke. I tried a Carlson .670 non-ported and it opened the 15yd pattern to about a volley ball size pattern....3" - 1 3/4oz. shells, didn't try the magnum loads or 3 1/2" shells. The 40yd opened up also, but it is better than what I was getting with the .665 and non Longbeard shells.
I never saw a pattern with big hole in the center. That's a bit odd I think.
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If you have a tendency to miss right or left high or low it may be the perfect choke lol
I had a son of a friend have that issue. He bought a full choke and it made a nice pattern to the left and right of the turkey head on the target. He then purchased an extra full choke and tightened up the group real nice. It was a 20 gauge but don't know what model gun it was.