MLKeith
I have some of the No Excuses 460gr. sized .503.
In your message you did not say if your Model 97 was an Ultra Mag or a regular White Model 97 with the shorter barrel...so...
Before you order you might want to try to find out what size you need... The Ultra Mags (White Model 97's) are a true .504 and a .503 will slide ride to the bottom with next to know pressure, actually the Bullshop .504 slide down to easy for my liking - but with a dirty barrel thay seem to hang in there.... Cdad got some .5045's from Bullshop and they were a better fit in my mind..... BUT... and Underclocked would be able to tell you more about this.... some Model 97's with a .504 barrel are tighter than the Ultra Mags and require the .503 or smaller
Just a heads from some of the stuff I have read on DWB's....