These are from Bishop Archery, only purchased thru their website. They are perhaps the most expensive arrows made—especially their Fire Arms Dispatch Eliminator models for super heavy dangerous game builds. But they are modular and are the straightest, most durable, lowest spined, and heaviest as well.
I don't know where you're located, but I'd be happy to let you try out my Krieghoff. I'm located in West Tennessee and the local gun club has a skeet layout and is located not far from my farm. We're about five miles from the Kentucky state line and about 100 miles west of Nashville.
I just joined today, I live in Louisiana. I joined mostly because of all of the 35 Whelen discussion as I am now very interested In the 35 Whelen. I have an 1885 Highwall that J.E.S.S. rebored to 35 Whelen