pro: the heavier barrel / syn stock will usually give you better performance in the end as that combination is less apt to succumb to weather vs. expansion / contraction of a wood stock, and barrel harmonics are reduced with the heavier barrel.
con: it is a heavier barrel, and probably will become heavier the older you get.
still, for a groundhog setup, i'd go with the heavy barrel, especially if taking shots 100+ yards. the extra accuraccy / consistancy the heavier barrel gives at those longer distances starts to pay off for the weight factor, IMO.
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