I am looking for some help. Here are the conditions.

I start with sa-182 (sometimes 479) 304ss or 316ss bar.
-drill and ream a 1/4" hole through.
-insert precision ground rod into hole with 0.0000" to 0.0001" total clearance. requires moderate hammer hits to insert.
-finish machine surface perpendicular to rod/hole/filter
-remove pin in direction away from machined surface with slide hammer

When rod is removed I am looking to achieve a burr free very sharp hole edge in addition to no galling on the way in or out. Ive used 304 to 304 and graphite powder and had slight to moderate gallin on the i.d. of the hole and rod.

-Suggestion for rod material that i can use to both avoid galling under this condition yet maintain like machinability so i have a burr free..very sharp hole left when i pull the rod out.

-lubrication suggestion for this condition?

When we make such a hole we will push a plug type broach through the hole then insert a teardrop plug hole into the hole with a small tip sticking out and the either Blanchard Grind the piece or use a conventional lap to take the tip off. The final step is to diamond lap the part for edge retention. Our requirements are a little tighter than yours and with no edge visible at 100X.
On some of the tougher alloys we will plate the broach with a flash coat of Copper, a mono- molecular layer for lubrication.

Another approach we will use at times is use a diamond or helical hone on the bore. Either one will true the hole and not leave a burr.

The type broach I was referring to is a tear drop shape ground on the end of an undersize push pin. It only makes line contact such as a ball would make. This is essentially Ballizing on a stick.  The plug is straight with a rounded nose and has "0" clearance with the bore for a snug fit. This holds the shape of bore while grinding or abrasive lapping. It is removed prior to diamond lapping. Diamond lapping will  will remove any edge left by any previous operation. As posted we inspect for an edge at 100X.
We use the flash Copper on the broach as a lubricant, 2-3 broaching operations without and 40-50 holes with the Copper plate.

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