I don't know the cost, but don't think it is too much.
The pressures generated are not directly proportional to the weight of the load.
Recoil can be calculated knowing the weight of the gun, payload weight, and speed of payload.
Pressure depends on the burn rate of powder used, the hull itself, and wad used--I don't think their is any mathematical formula to calculate pressure, and it must be measured directly. At least that is what I believe to be true, not a physicist or engineer, however.
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"How kind it is that most of us will never know when we have fired our last shot"--Nash Buckingham
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