Handloading Question

This is a question for Mark Hoffman regarding his article on reloading in the Jan/Feb 2008 issue (“How To 101,” page 16). It is about using a rod to measure the OVL of a cartridge. It worked OK for my 300 and my 6.5, but it did not work for my .25-06. I have a Browning A-Bolt, using Nosler 110 Accubonds. The Nosler book said maximum OVL is 3.250, I reloaded at 3.225. The rod measuring said it should be 3.063, that is a huge difference. Any ideas what went wrong? Hope to hear from you.
Bob Hannah
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