5.5" barrel

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    45 Colt data for 5.5 " SAA

    I am beginning to load 45 Colt for a Ruger New Vaquero. All the data I see shows velocities obtained from a 7.5" barrel SAA. I would like to get about 850 fps from a 250 grain Hornaday XTP from my 5.5" barrel but max loads show 900 ish from 7.5" barrels. Any ideas on where to get data for 5.5"...
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