The 12 FVSS is a varmint rifle and thus is built with a varmint weight barrel. The varmint weight barrels are standard shank. It is not neccesary to utilize a large shank barrel unless you intend to chamber it for a WSM or RSAUM cartridges.
The target actions offer some things that are not available in the standard actions, such as left port and dual port. As far as a target action being more accurate....nobody has proven it.
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