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Was the velocity the same as your standard load?
I have loaded to powder weights for the 470 just to make sure the velocity/ pressure is not to excessive.

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I think they say same velocity with 8% less powder so I don't know if that is 8% more pressure or because of the driving bands they are 8% easier to push ?.

Yes, close enough and no extra pressure.
They look wild when you load them as in they should give pressure but that is not what I found in my 375.