I have a PRM 428 mounted on a 6.5 Creedmoor. Have not been able to consistently hit past 400 yards with it and 1,000 is really a hit and miss. I have contacted Gunwerks twice and have not heard a word. Their website says we won't leave you hanging and I beg to differ. Had this thing since March and have not made peace with it yet. Anyone want to buy it for a good price? But do not expect customer service from Gunwerks and you can tell them I said so.