The first set of the ATI Shotforce Stock set I had did not stand up to the massive recoil being generated (roughly equivalent to that 416 Rigby, according to the numbers) by the rounds I was using. The forend tore up around the front lug, and the butt end became loose on its mounting screw. I made some modifications to "beef-up" the design on mine, but then found out from ATI that there had been some complaints and they were being redesigned and re-released. They just sent me a new set that I will soon install and see...
These offer me a higher degree of flexibility of use which may not be "aesthetically" correct for some purists but suit me just fine.
I have made a few modifications to my NEF that have enhanced its function to me. Recently, I purchased a chronograph and am now considering also getting pressure testing gear in order to properly develop some custom rounds I am interested in. When I have more of the results, I will post details. In the meantime, I will answer PM's from the less-patient.
Now, in the inmortal words of The Poet (John Lee Hooker)...
Boom, Boom, Boom, Boom