The varmint nightmare and dogtown are the the same bullet.It been said that they are made by Nosler.If I was you I would buy a few to try. I used them in 6 different rifles 2.204s 2.223s 22-250 and .220 The one gun I couldn't get good groups at 100yds. The other 5 shot half decent at 100 yds all over the paper at longer range.Don't ask me why I don't know and I shot a lot of them.
The one .223 shot them into .75 at 100yds. At 165 (the furthest I can shoot at the house) they were close to 2 inches.