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.

The new Lyman book shows pressure both in PSI and CUP . One other thing when compairing the " long and short of it" sorry about that check your barrel length. In many cases you will find that your rifle has a barrel several inches shorter barrel then the test barrels. This is why in the case with Weatherby, alot of their catilog velosities are higher then loading manuals. It used to be that Weatherby used pressure guns for testing and these have 30" tubes.
You are right about the laz, or should it be hot and spicy peperoni cartridges. Their pressures are really pushing things, and when you look at velosity figures check their barrel length, most are in the 29" range if I remember.

Thanks, I have never read the Lyman manuel. Might want to check it out.