Greetings,
I would expect the Speer to give less velocity. I recorded a difference of 100 fps between the Hornady 129 grain and the Nosler 129 grain LRAB in a 6.5-06 with everything else the same. What was the source of your data? Just checking a couple of sources don't show anywhere near 3,300 fps with the 100 grain partition. I can probably help with the 6.5x55 if you would like to share or PM the details.
Regards Grandpamac.
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