I sent the following off to Brownell's:

"Department: Technical Support (GunTech)
Order ID:
SKU: 080-943-213WB (.213\") or 080-943-022WB (.215\")
Message:
I need one of the pilots above, but do not know which one to
order. It will be used on a Remington 552 and a Remington
550. Can you help me out?"

.....and got the following answer:

"I would start with the .213", if it is too loose than go up to the .215"."

Since this is going to be used only twice, I sure as heck do not
need a spare that will never be used lying around!

Does anyone here know Remington's land-land specs for their .22RF's?

Drive a slug through the bore, mike it, and buy the right pilot.......once.

Jeff

You will need a blade micrometer, 'cause you're gonna mic the grooves in the bullet to determine bore diameter and thus pilot size.

No need for a blade mic. Just cut away the lead( with a knife) on the sides of the groove so that a standard mic anvil will contact the groove bottom. Do this on opposite sides of the slug and measure it.

RAN

Forgot to add that if you have, or have access to, a pin gauge set... that would work as well.

Jeff

Anybody remember the size call out on a #3 drill ?

Duhhhhhh

GTC

Reamer pilots come in .0002" increments. Not 2 thousands, two ten thousands. There are a couple places that rent these. Akjeff is right if you have access to deltronic pins, they can get the right fit. You want a snug fit, not too tight to where you scar the lands, but too loose and it can chatter and not be as accurate.