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I would not worry about the 5 lbs over. One of the factors that affects the muzzle velocity is the barrel length. In general, the longer the barrel, the higher the velocity. This is true until the barrel is long enough for all of the powder to burn and the friction to overcome the force of the expanding gas.

I would guess that the barrel being shorter by .3" would drop the muzzle velocity down enough to drop the muzzle energy down close to the five pounds. You could chronograph it and calcualte it out to make sure.