I assume by open choke you mean cylinder bore. Cylinder bore allows to much spread and could make an irregular pattern and put less shot on target so you might want to rethink your 'no choke' strategy.
Nothing wrong with penetration of #4 buck and it actually makes a larger wound opening because of more shot. Sometimes bigger shot isn't the total answer. Just pattern it so you know where it hits and experiment with chokes to get the best pattern but a full choke should do well. An IM choke at the very least.
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Last edited by Old Grump; August 24, 2012 at 02:54 PM.