June 14th, 2014, 02:00 PM
Join Date: Jul 2004
I've "tuned" a Polytech I have for practice as it saves wear on the match rifle barrels. I use it in offhand, rapid sitting, and rapid prone. People at the range are very complimentary seeing the Polytech in action, then amazed when they see what a match conditioned rifle can do. I'm an average shot imo.
If you are seeing groups like this at 100 yds, it seems to me there are loose components and/or excessive headspace in your rifle for what you are shooting. For example, I push a 168 gr. HPBT with IMR 4895 or 4064 around 42 gr, same COAL. Its accurate in the Polytech and match rifles. Good enough to wear out the X-ring at 100 yds. on an SR-C target (std. target for 200 yds, but good for load development and testing).
As mentioned, try a bench with a support or off sandbags. If the groups aren't closing, then check the rear sight assembly for loose fit or slop in the rack. The overindexed barrel is going to be a challenge for sights.