I believe that the G88 is considered as not strong enough to handle modern 8mm loads. The action lacks the safety lug that the Mausers had in later models. Also the bore is tighter, which would raise pressures higher. The G88 and early mausers with tight bores are why SAAMI spec 8mm is weaker and has a slightly smaller diameter bullet.
I have one which was rebarreled by the Turks to later bore specs, but I still am careful with it.