I have to say that 35 Whelen was my favorite rifle for about 18-19 years it still is except I gave it to my son I started out with Reloader 12 but without me knowing they quit making it so I moved to 15 had all intentions of using 250 bullets but after shooting a while noticed that only way to get good groups was to single load the magazine recoil and oversized magazine in my Rem 700 keep smashing the exposed lead so I tried Nosler 225 accubonds and have not looked back. The thing I noticed was that I could load them long and not have interference with rifleing and she loves them that way. Reloader 15 is my go to powder.
The Whelen is a great cartridge that Remington almost killed with factory loads that were lake luster and barely beating 35 Rem.
Shawn