Axises aren't really a great choice for lightweight, short action rifles, but the factory handle is almost certainly going to be the lightest. A handle from Glades Armory, who I think is the only source of aftermarket bolt handles at the moment, probably isn't going to save much weight if any.
If you want a bigger knob (and who doesn't?), and are willing and able to do it yourself, you could use a phenolic oval knob. Phenolic can be shaped like wood with an increased need in respiratory protection. The oval knob can be made into whatever shape you can fit on it. I've done a few:
The second one is harder to see, but I ended up checkering it after I reduced the diameter with a drill and belt grinder.
That said, any aluminum knob is going to be pretty light too so long as you have a threaded handle.
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