Holder/drill combo for tight tolerance drilling in aluminum

Like the title says... what is the best style holder and tool for "tight tolerance" holes?
.3165 dia, +/-0.0008, .315-.355 deep, through the part, 6061. This hole needs a slip fit for a pin, so we need a reasonably smooth surface finish to boot.
This is a feature we have interpolated for years but I'm sure there is some sort of holder/tool combo that will let us blast them out in a lot less time, especially considering we're running these through a Brother w/16k spindle.
We do 100k's of these holes so something that will hold size and doesn't have to be swapped regularly is a huge bonus.
PCD tipped drill? Regular ol' solid carbide good enough? Coated or bright?
We don't have a shrinkfit or rego machine, is a collet chuck going to be good enough? SK vs ER?

Accuromm's g-drills will do that with ease. Get a few PCD drills made and you won't touch them for years. https://www.accuromm.com/products/round-tooling

I'm not the CNC guy but think a bright carbide or PDC drill or reamer made to .3157 would cut at .3159 after a pre drill and be in spec for a good long time, with over .001 of safety.
Perhaps a 3 flute drill might be good.

TKassoc said:

Accuromm's g-drills will do that with ease. Get a few PCD drills made and you won't touch them for years. https://www.accuromm.com/products/round-tooling

Click to expand...

Question about ordering a custom tool like that: Would you match the drill diameter to the exact hole dimension, or would you try to compensate for the hole coming out larger/smaller than the nominal drill diameter?

QT: (would you try to compensate for the hole coming out larger/smaller than the nominal drill diameter?)
Very often a drill (with a pre-drill) / reamer / gun drill or gun reamer will finish at .0002 over the cutter size.

The back taper OD will make them grow smaller in diameter as they are sharpened shorter, so a balance of the first hole and after sharpened a number of times is considered to get the best tool life...
All of these have a cylindrical OD grind, unlike an end mill that is sharp on the OD and so tries to cut the OD larger with any spindle or holder run out.

I suspect a G-drill would be like a single flute gun drill so would do the same.