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From a quick internet search it sounds like the claim is that the point was made of softer/thinner metal -- if so, there should be archaeological finds and chances are someone has built reconstructions to test the thesis.
You might check the Roman Army Talk forums -- it's full of both Roman military history enthusiasts and reenactors, so someone is bound to have experience.
It seems to me it's also likely that the construction of the pilum changed over time so it may depend on what period you're talking about.