Yes, owned one for about 10 years in the 1970's and 80's, it was a custom on an 03 action, very accurate. I bought it for a moose hunt that I never drew a tag for, so I killed a bunch of deer with it and loaded 38 Special DEWC over a light load of shotgun powder and slew a even bigger bunch of tree squires for the pot. It would shoot cloverleafs at 50 yards with the DEWC. I owned a gun shop at the time and someone offered me more than I could refuse for it. I replaced it with a Rem 721 rebored to 35 Whelen around 1989, still have it. I'm kind of an old school guy and have never found any bullet that could do more for me in the Whelen or 358N than the old cup and core Horn. 250gr RN, it never performs poorly.
You didn't ask for info on newer powders and said the 350 data you got was off a site, had to assume you don't have a manual. Sorry just working with your limited info.