I've never used this ammo, matter of fact, never heard of it before. I remember the Win 30-06 55 gr. ammo that appeared 20+ years ago that would not stabilize in most rifles and wondered if this 100 gr. Liberty Ammo would stabilize. I called their number in Florida and spoke with their rep Matt Phillips for a response. He said that as far he knew that it worked well in fast and slow twist rifles, but he said he didn't want to lie to me, so he took my number and said he'd find out for sure and call me back. About 10 minutes later he called, and I was outside, so he left a message. He said the 1 in 10 twist is what was used to test the ammo, and if I had any more questions to call him back. Its pretty expensive as -06 ammo goes, but I guess thats because its a speciality varmint round. 3500 fps is moving.