I agree with the suggestion to pattern the buckshot out of your gun, and I would try the modified choke first (it has patterned best for me). I think your plan is great. I am a huge fan of 00 buck and have killed 20 deer and hogs with it, but I sure try to limit my range to 30 yards and under. I have made clean kills out to 40 yards, but that is stretching it in my opinion.
Good luck and happy hunting!
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