The Savage PTA "target" action uses large shank barrels. The action that you are calling a varmint action, such as the model 12FV everyone is building off of, uses a small shank barrel. Also, like you mentioned, the target action is a single feed. Now, you can get the Savage Model 12 LRP which has a target action that uses a large shank barrel and has the 4 + 1 capacity.. I can't recall if that model has bottom metal or a bling mag... Hope this helps...
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