If this is your combination, which choke are you using and what are your 40 yard pattern numbers??
I'm not shooting that one anymore but a buddy of mine now has the gun. It's a 26" barrel with an IC .665. I can't remember the numbers but it was an excellent pattern.
835 24" barrel with star dot choke 676 and long beard 3.5" #5s I normally get around 220
I asked for the SX3/3.5" Longbeard 5's combination.
I have a 3 1/2" version with a 28" barrel. I used it with a .665 indian creek for the first couple of years and it averaged in the 180's with the long beard #5. I bought a .675 Sumtoy and it will average in the 190's to low 200's. I sold the indian creek mainly because the sumtoy was a lot more even and better looking pattern.
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This isn't an SX3, but and SXP. I shoot a carlsons longbeard .665. These are the shells you're asking about. My 40 yard shot I pulled a little right.
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PM'ed ya.