When I was in your position about 2 years ago, I spoke with Ernie. Ernie is on this forum and the Specialty Pistol forum as well as others. He doesn't build them but has lots of knowledge about them. I have his number if you want to send me an email and I'll give it to you. Even though Ernie gives out his number readily on the net, I don't feel right doing it for him.

After he gave me some guidance, I built a rear grip 20 Vartarg which is my favorite. Later I built a center grip 223. I use both for prairie dogs. I used Remeage barrels for both builds on Rem. 700 actions.

Make contact with Ernie, he will not lead you astray.