Most that are not weighed are over estimated, just like big fish. The only way to estimate accurately is if you have actually seen a lot that were actually weighed.
I cleaned a spike this year for my dad that he ran over. That deer weighed in my estimate nearly 150 lbs. I heard my dad tell a co-worker that it was a huge spike that weighed 200 lbs. It was a big spike with 10" long heavy spikes but he weighed closer to 140 than 200.
