Shotshell Pressure Question?

[Bruce Day]

That's because of the difference between black powder drams and smokeless powder dram equivalents. It takes more BP to achieve a given velocity than smokeless, dre is based upon velocity, and the recoil formula is based upon the ejecta, which is greater for BP.

[Mike Stahle]

So bottom line, going BP is not necessarily the best way to go?
Using black powder indeed keeps the chamber pressures way down.
BUT, at the cost of beating the gun and operator with recoil.