Llama Bob,

I have also spent considerable time in a piezo lab, including performing a few experiments. But I also prefer to have more data than one example.

Here are the maximum velocity results from the 7mm WSM, 7mm Remington Magnum and 7mm Weatherby Magnum, using the latest available data. I left out a few sources that did not include extensive data, used different measurement methods for them, or included obvious misprints. Please note that only one sources used a different length test barrel for the 7mm Weatherby.

Barnes (24" barrels all cartridges)
WSM 160-2920, 175-2845
Rem. 160-2858, 175-2757
Wby 160-3079, 175-2931

Hornady (24" WSM and Rem, 26" Wby)
WSM 162-3000, 175-2900
Rem. 162-3000, 175-2900
Wby 162-3200, 175-3100

Norma (26" barrels both cartridges)
No WSM data
Rem. 160-3074, 175-2759
Wby. 160-3199, 175-3038

Nosler (24" barrels all cartridges)
WSM 160-2951, 175-3061
Rem. 160-3077, 175-2970
Wby. 160-3065, 175-3197

Speer (24" barrels all cartridges)
WSM 160-3090, 175-no data
Rem. 160-3049, 175-2954
Wby. 160-3142, 175-3016

Averages:
WSM 160/162-2990, 175-2935
Rem. 160-2912, 175-2868
Wby. 160-3137, 165-3077

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck