The fire forming load I use is so accurate that I can find a ton of uses to form with it. I'd sure not worry about it but that's just me.
As for the diffs in speeds of the big 7's I'd find a couple people with tons of experience with them and go with what they say.
Dober
"True respect starts with the way you treat others, and it is earned over a lifetime of demonstrating kindness, honor and dignity"....Tony Dungy
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