I have shot .357/158 gr. pistol bullets in my .35 Whelen, Midway offered bulk packed blems a few years ago and I stocked up. IMR 4759 is hard to find because the mfr. only makes a small batch a year, it was discontinued a while ago but to my understanding has been brought back into production. I haven't tried to find any since the component shortage and have been using Unique since I have a large supply. I also use Unique with cast bullets in the 200-210-215 weights, 15gr. gives outstanding accuracy in my rebored pre'64 M/70.
