I have a Thompson Center Encore that I got a .300 Win Mag. bbl for. Its a breach loader single shot of course. I've been trying to develop an optimum load using Sierra Gameking #2125 150 gr bullets. It will shoot 100 yard groups of 1.5 MOA just fine, and I have gotten a few .75 MOA groups out of it.
I'm still doing load development using Accurate Magpro, and Quickload using the Chris Long tables for optimal bbl. time, taking velocities with my Chrono, and backing into an actual history matched Burn rate for the powder. I'm getting close to trying everything I can think of to make it shoot 1 MOA or better every outing. I just cleaned the crap out of the bbl, its a 28 incher by the way, stainless. It had maybe 400 rounds and I thought I was doing a good job of cleaning it, but I got a borescope and discovered a heck of a lot of copper in it. So, now it shiny and I'm getting it refouled a little to get some equilibrium back. The things I am doing now are neck turning all my Peterson cases, and I plan to start working on bullet seating depth too.
I have been just using 3.34 COAL as I worked on which powder to use. I tried, 4350, N560, RS Magnum, and Accurate Magpro. I want to achieve at least 3250 MV with the 150 gr. Sierra's. I can go to 3375 or so safely with this bullet and the AC Magpro, but no need to get that kind of velocity.
My question is this......am I just stacking deck chairs on the Titanic or with all my efforts is there any hope of this rifle ever shooting 1 MOA or better consistently? My next step is to try getting the bullet .02 to 03 of the lands, as I think 3.34 may be more like .07 off. Only I can't find any .300 Win mag modified cases for the Hornady LNL tool, so I'm sort of guesstimating based on trial and error no science exactly where I am. I can't believe you can't even find simple bushings, and modified drilled cases these days.........Good grief its crazy or there is a conspiracy.......I vascillate day to day on which it is......
Anyway, advice on what's achievable with this rifle? Its got 8 to 16 power Bushnell optics, and I've had no issue with scope on it.
I'm still doing load development using Accurate Magpro, and Quickload using the Chris Long tables for optimal bbl. time, taking velocities with my Chrono, and backing into an actual history matched Burn rate for the powder. I'm getting close to trying everything I can think of to make it shoot 1 MOA or better every outing. I just cleaned the crap out of the bbl, its a 28 incher by the way, stainless. It had maybe 400 rounds and I thought I was doing a good job of cleaning it, but I got a borescope and discovered a heck of a lot of copper in it. So, now it shiny and I'm getting it refouled a little to get some equilibrium back. The things I am doing now are neck turning all my Peterson cases, and I plan to start working on bullet seating depth too.
I have been just using 3.34 COAL as I worked on which powder to use. I tried, 4350, N560, RS Magnum, and Accurate Magpro. I want to achieve at least 3250 MV with the 150 gr. Sierra's. I can go to 3375 or so safely with this bullet and the AC Magpro, but no need to get that kind of velocity.
My question is this......am I just stacking deck chairs on the Titanic or with all my efforts is there any hope of this rifle ever shooting 1 MOA or better consistently? My next step is to try getting the bullet .02 to 03 of the lands, as I think 3.34 may be more like .07 off. Only I can't find any .300 Win mag modified cases for the Hornady LNL tool, so I'm sort of guesstimating based on trial and error no science exactly where I am. I can't believe you can't even find simple bushings, and modified drilled cases these days.........Good grief its crazy or there is a conspiracy.......I vascillate day to day on which it is......
Anyway, advice on what's achievable with this rifle? Its got 8 to 16 power Bushnell optics, and I've had no issue with scope on it.