Andy,
I read about these not too long ago whilst researching the M66 slide action. I don't recall much, nor did I save the links, but as far as I gathered in the 80's Mauser may have used the Voere action as the M225, because they rescued or bought out Voere after becoming insolvent. My understanding is they just re-branded the Voere as a Mauser for a set period, which became known as the 99 in the US??? but it wasn't actually a Mauser designed or manufactured action.
I think it was/may have been made on the basis of the rather unsuccesful M66 slide/telescopic action, which was a front runner in design for straight pull bolts. of couse, the 225 action is a traditional bolt action, and the rest of the rifle and stock, etc. looks like it's just a 66,,with the Voere action,,which by design looks a tad like the turn bolt version of the M66.
do you have one?