Assuming a 1 1/8oz load there is 461 #8 pellets. This would give you a 38% pellet count at 45 yards. The chart that I have only goes up to 40 yards and a 40% pellet count is Cylinder choke at the 40 yard mark. The chart also shows pretty much a 20% decrease every 10 yards, so...we could extrapolate that it would be about skeet choke which is listed as 50% pattern at 40 yards and an extrapolated 40% pattern at 45 yards.
I had that gun listed as Mod/Cyl but it may have been with a galazan brass choke gauge (which will not be all that accurate seeing as the bores are probably not .730" )and not by the constriction. Next time you are into GM take the barrels in and have the gunsmith measure the choke constriction. Other than that you will need to shoot it at some paper at known distances.
Good Luck,
Kurt
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