"Either Julia is getting carried away with gun values or the consignors are getting greedy."

At least on the Lefevers, they were pretty much on target. Bob Noble provided this summary list. I bought one of them, just below the low estimate. When you add the buyer's premium, I think four were ABOVE estimate, all the rest within their estimated range.

3479 opt 40K
3480 AA 45K
3481 super G 15K
3482 B grade Ithaca built 42.5K
3483 CE 12 7K
3484 CE 12 6K
2485 CE 20 mono blocked 6K
3486 D grade 3.5K
3487 EE Ithaca built 3.75K
3488 SO 1.25K
3489 Early E $400
3491 C grade 3 bbl gun. 14K
3492 BL 7.5K
3493 DM 16 ga 27.5K
3494 DM. 10K
3495 DM 9.5K
3496 DM 6C 8.5K

There were so many really high end guns that I suspect the offerings just over whelmed the buyers' budgets!