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4" to 83/8" difference.......
A LOT will depend on the individual guns being compared.
Difference might be 200 fps.....or could be less than 100.
That's why factory chrono data should be used for comparison between loads from that manufacturer. They would have been tested from the same rig.
Relativity my dear Watson, relativity.
I have found 100 fps difference between identical guns from the same order with same lot of ammo. Each gun is an individual.
Sam
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