Hi Mike, I have fired thousands of rounds through different rifles with EGW 20MOA bases. To this date I have never had a problem with shifting or point of impact change, even on my 300 RUM.
I've used more expensive types but all that does is make people think I had money.
Realistically though, all bases are held on with 4 tiny screws, so you may even consider gluing it on.
For what it's worth, I've won dozens of 1000 yard shoots in the I.B.S with $40-50 bases