I looked around a few months ago and no one had one. So I got my own custom reamers made. I have 1 in standard 458 Lott length (2.800") with .250" freebore ,1.30 leade angle. I then got another with the same dimensions exept it cuts a chamber 2.870" (watts is 2.850")long to suit any Lott brass ,Watts brass ,untrimmed 375 or 458 basic brass . AS long as the rechamber is being done by a gunsmith and not hand turned ,you can borrow mine.