I was one of the privileged few who were beta testers for the Whidden Eley test bench. Martyn Buttery and Mike Atkinson from Eley UK came over the past weekend to train the WGW staff on the Eley methodology.
The point being, each test center in the world is doing it exactly the same. John has two benches set up side by side and they are of identical construction. The Eley testing will be done on a Meyton target system at 50 Meters because that is the Eley standard and the evaluation software is written to work with Meyton. Beside that target, and at 100 meters, is a Megalink target. As of our visit the Megalink targets were installed but not operational due to a software activation issue they had to work out with Megalink.
Being able to make one trip and test Eley, Lapua, SK, Norma and RWS ammo is something that has never been available to anyone, probably in the world. On top of that, if you make the effort to test and a suitable lot can't be found, one might assume the gun has issues and while there you have the chance to have it examined by a world class rifle builder.
The other intangible benefit is the impartial approach to testing that comes from an independent tester. Granted, Whidden has partnered with Eley but I truly believe the data coming out of this test range will benefit the rimfire shooting community. Lessons were learned while we were their by Eley and the WGW staff. I don't know what processes will be followed when testing the other brands of ammo but I suspect it will closely resemble the Eley process, especially if testing multiple brands and grades. The difference is on the Megalink bench one will get shot information at 50 meters and 100 meters. While not in place during our visit there is ample room beside the benches to get down in position and validate the ammo while shooting it from the shoulder or from a rest, for those who might not trust the results from a rigid mounting.
Speaking of rigid: I placed my iPhone on the vice while testing my rifle. I have a vibration analysis app on the phone that is basically a seismograph strip chart. The static vibration of the bench was less than +- .001 G's. I tapped on the vice with my knuckles to make it register and it didn't move the "needle". I also opened and closed my bolt a few times with the same result. Once we fired the rifle the needle did move but it recovered back to the static range in less than 200 milliseconds. The concrete is stable and the bench is stable. The only motion being transmitted to the rifle is the vibration of the earth.