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The general rule is that you get about 10% more hop utilization from pellet hops. So I'd use about 0.909 times the hops in the beer, if you're trying to do it precisely*.
I believe Liberty uses 2-row. Roughly speaking, there's about three major base malts you can use for the bulk of most beers: Pils malt, Maris Otter, and domestic 2-row. They're all actually 2-row barley and used primarily as the bulk of the grist in most recipes (excepting some that are mostly Munich or other weird beers), but MO is a particular strain of barley and is kilned a touch more. Pils is kilned a touch less. The result is a different flavor in the base of the beer. Best rule of thumb here is: american beers get domestic 2-row, british get MO, and continental ones get Pils. Rules are meant to be broken, so experiment away. I sometimes brew an IPA that's 2/3 2row and 1/3 MO.
* hops degrade a bit in the freezer over time, and people cannot detect a bitterness difference less than 5 IBUs apparently, so having a goal of precision might be ultimately impossible and even possibly a waste of worry. That said, it can't hurt to start in the most-likely position.
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