A lot of good info on the guns, how they got data back with the 10 inch test barrels,then the 7,then getting a 6" vented barrel as a "Standard" test tube but not always followed,some even with 4 inch barrels.

However we must learn that each model,be it a N frame, the K frame which was made with a weak barrel,with the bottom shaved to make the parts fit correctly,to the light J frame of today............. that they were made for a certain ammo and velosity of their time.

Longer barrels did get higher velosity but trying to get maximum out of a 4 inch of today is asking too much of the revolver. We need to know what a gun is capable of and not try to squeeze more out of it,even though it states..."Magnum". You can't get N fram velositys from a K frame and hope it will last or be safe for that matter.

A good "Factory " magnum load is posible with most guns but can they hold up ? L frames and up,yes...............
Feed your guns the correct ammo and make them last...........