Boring a cylinder

[azshadeguy]

For .25mm oversize it could all be honed with a rigid hone. Skip the boring

I ordered one of these
https://www.tooltopia.com/lisle-150...MIob6Yiu-W1wIVUhbTCh326wBpEAkYASABEgIl7fD_BwE

 

[BogusSVO]

that should do the job, flood the bore with a hone oil to keep the grit washed out

you want the cross hatch to be 60* to 90*