[Brian Pfleuger]

You can pretty well expect to be below published velocities. Most load data is developed using SAAMI minimum chamber dimensions which maximizes pressure. Real guns usually have larger chambers and will develop lower velocity.

Add in the variables of case internal volume, powder lot variance and primer brands and there's really no way to expect that you'll match published data because you happen to have a bullet that weighs the same amount but everything else from the gun to the primer is different.

All that said, I am a believer in achieving the capabilities of a cartridge. If you'd wanted a 7mm-08, you'd have bought one, right? You want a 7mm Mag.

So, try a different powder lot maybe, or a different powder, primer or cases.