I had one of those built in 1999, last century, after reading about it in HANDLOADER 187 Jun-Jul 1997:
I used a Douglas No. 3 sporter, 1:12" twist, 22" long, stainless, on a Connecticut M70 Classic Stainless Featherweight.
Donor rifle was a .270 Win in a Tupperware stock.
It did beat my 24"-barreled .35 Whelen Pre-'64 M70 (re-barreled .30-06) by a little bit.
The .35 Whelen used a Douglas No. 4 sporter, 1:12", and original walnut stock.
It was a DRT pig flattener.
The .35 Brown Whelen was eventually rebarreled to .400 Whelen-B+ with a 3.6" magazine box.
A trip to the gunsmith would be required to put that sporty .35 Brown Whelen barrel back onto it.
I won't be using that barrel as rebar in the patio project.
Richard Conrad said:
"... it was designed by one C. Norman Brown. Keith Francis of JGS was kind enough to provide the following historical information.
He says that he first made a reamer for the .35 Brown-Whelen based on a fired case received from rifle maker Keith Stegall in 1967.
Some 18 years later he supplied several sets of reamers in various calibers to a C. Norman Brown of Anchorage, Alaska."
So, in 1985 Mr. Brown bought the reamer again, made from the drawing above by JGS, dated 1985 and 1993.
Mentioned calibers: 7mm, .30, .338, .358 (.35 Brown Whelen), .375, and by the way, John Kronfeld wrote about the .400 Brown-Whelen in
BIG BORE RIFLES AND CARTRIDGES, Wolfe Publishing, 1991.