Here is my Remington 700 5R 300 Win Mag that is currently in progress. This rifle was factory built in April 2011. I bought it in like new condition from Gunbroker a few weeks ago. It is bedded into the factory stock, with a tuned Rifle Basix trigger and a Suppressed Armament Systems Muzzle Brake/Suppressor attachment to mount a SAS Titanium Arbiter once my tax stamp gets approved.
The barreled action and bottom metal is cerakoted OD green to coincide with the green webbing in the stock. The scope is a Sightron SIII 6-24x50 LRMOA utilizing a mark 4 base and rings.
The target below is picture taken during load development yesterday using 4 shot groups at 110 yards using Retumbo and 230 Berger tactical hybrids. Accuracy started coming in at 77.5 grains and at 78.0 grains it all came together with duplicating velocities. I need to take it out to long range, but needless to say, I'm a bit surprised with it so far.
I've shot quite a bit of H1000 through it as well, but the accuracy and expected velocity did not correspond. I was able to get 1/2 MOA with 73.0 grains of H1000 but it was about 100 fps slower than I expected at 2660 fps with less than desirable velocity spreads. I worked it up to 76.0 grains but the 1/2 MOA accuracy never came back and velocity declined after 75.5 grains. Therefore, I decided to give Retumbo a try.
I'm planning to take it out tomorrow to shoot through the suppressor that currently resides with my class II dealer friend.
Here are the load details. As always, work up with caution.
300 Win Mag
230 Berger OTM tactical
78.0 grains Retumbo
Once fired Remington Brass with shoulder bumped .001
Federal 215 Primer
.005 into the lands
No obvious pressure signs
2886 fps through chronograph