Looked on the web at different powder company reloading data and from what I have seen the regular magnums are loaded frm 59,000 - 61,500 P.S.I. and the short magnums are loaded from 60,000 - 62,000 P.S.I. Not much differance in maximum pressures. When they are both generating the same maximum pressures and using heavier bullets the regular magnums tend to beat out the short magnums a little bit. Not by much though.

The short magnums deliver real dang close to regular magnum velocites with out the belt, less powder, shorter stiffer bolt. Hype? If you say so, but accrding to the reloading data they do what they were intended to do.

Now, if you want to se some really high pressure numbers go to Lazzeroni' s site and look at their data. 66,000 67,000 P.S.I. working pressures.