I should add that it uses a small rifle primer, which I believe was found to be more consistent accuracy wise in this case, but may also be a factor in enabling the cartridge to handle high pressure.

Mine is set up with a 20in barrel and suppressor, which I use as my winter deer rifle. With 37-38gr of N150 and 123gr bullets I am getting excellent accuracy and just over 2850fps which is what I built the rifle to achieve. It shoots well and I get full burn before the bullet hits the suppressor, but with a longer 25in barrel I think it could achieve more.

For 1000yds, the 130gr berger or 139 scenar have a good reputation with N550 - a load I was given by a Lapua team shooter was 39.8gr N550 with CCI450 and 139 scenars for just shy of 3000fps, but this was in a 31in barrel. He advised starting at 39gr with 130 bergers but I'm sure that he assumes a modern target/benchrest type action, so be warned!