From the descriptions given, alone, I'd say these aren't really worth being written up as Items of Power.
Guns not needing reloading is merely an issue of not getting compelled to need to reload your guns, and as such, not worth refresh, so if those aren't also substantially better than other guns in some additional ways, then there's nothing to get a rebate on and you might as well leave it just as an aspect.
For the shapeshifting weapon, weapon ratings in the DFrpg are very coarse. It doesn't so much matter whether your weapon is more deadly because of it's single hit damage potential or it's potential for quick consecutive attacks, it'll end up with the same or a similar weapon rating in any case. Each of those three forms seems like it would be (for a normal version of that weapon) about weapon:3 or so.
I really don't see shifting your weapon between those three forms as being worth meaningful refresh, so I'd tack a [-0] power on there, at most, and we end up with the same problem as above. Unless they're also better than a normal sword/axe/scythe, they aren't worth being IoPs.