4lbs 10oz = 74oz/26 = ~2.8oz per inch x 6 = ~ 17oz, so since the muzzle is smaller than the chamber I would gussstimate that you would lose a little less than a pound.
as far as velocity goes, what caliber is it? High octane large cartridges lose more than smaller lower velocity ones.
wierd, my reply posted to a different thread?
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