Sort of. When you tap Pewter, the primary effect is increased strength, but the secondary effects are increased muscle size (and thus increase in mass), and also (presumably) a slight increase in the stretchability of skin (to allow for increased muscle size). These, per the Law of Feruchemic Storage, are also attributes stored when you're storing pewter.
But it doesn't have all the abilities than allomantic pewter has. Allomantic pewter increases strength, agility, speed, endurance, and healing. It's like a big adrenaline burst. Feruchemists have to store all of these things separately. Pewter only stores strength, Gold stores health, Steel stores speed, and bronze stores wakefulness. I bet that Gold would probably help a lot with your endurance.