Developing labs - wanting full frame prints

Greetings,
I am using a Mamiya RB67. I live in the Milwaukee area. While a local
store processes the color film, B&W is sent out for processing. With
the color film, I request full frame, and the local store is able to
deliver 4x5 prints with a small white border on the top and bottom.
The border is roughly 1/16" to 1/8" inch.

For the black and white, however, the other facility claims it cannot
print full frame. I am looking for a place I can send my 6x7 B&W
negative and get full frame 4x5 prints. ANd facilities out there that
do a good job and will accept prints through the mail?

Thanks,
Tom

Negative carriers have to crop a little to hold the film flat.

Negative carriers have to crop a little to hold the film flat.