Some of you may know that I've had a Remington 700 Long Range in .300 Winchester for awhile now. Well I had been tinkering with 190 SMKs and my best group was right at .5 MOA and most were around .75 MOA. I wasn't very pleased with this and the MatchKings left a lot of copper in my barrel even after just a few shots. After doing a lot of load development with the 190s I ran out of time and I started focusing more on school.
Over Christmas break I did a little testing with 208gr A-MAXs but never shot any for group. Just wanted to see what the pressure signs were with some IMR 7828 loads. Well that all changed when I shot a 3 shot group with my .300 yesterday. I loaded 74.0grs of IMR 7828ssc into a Federal nickel plated case lit by a Remington LR Mag primer and topped with a 208gr A-MAX. Through testing I found 74.0gr gave good velocity but was not a hot hot load, it was just right. My primers aren't cratered or completely crushed flat and there's no ejector marks or rough bolt lift. I shot a couple shots at 700yds at some steel and I dialed for 2900fps but shot about 6" high. I haven't chronographed this load yet but by adjusting velocities on my ballistics app, I am in the ballpark of 2950-3000fps and I am beyond pleased with that. But what I am even more happy about is how well this load and rifle did at 100yds. Below is the picture of my 3 shot group at 100 yards. This beyond exceeded my expectations for the rifle and I am glad it's under .5 MOA now and from the looks of it, it will be a consistent sub-half MOA rifle. Keeping my fingers crossed that the 200gr ELD-X bullets will do this well!
Over Christmas break I did a little testing with 208gr A-MAXs but never shot any for group. Just wanted to see what the pressure signs were with some IMR 7828 loads. Well that all changed when I shot a 3 shot group with my .300 yesterday. I loaded 74.0grs of IMR 7828ssc into a Federal nickel plated case lit by a Remington LR Mag primer and topped with a 208gr A-MAX. Through testing I found 74.0gr gave good velocity but was not a hot hot load, it was just right. My primers aren't cratered or completely crushed flat and there's no ejector marks or rough bolt lift. I shot a couple shots at 700yds at some steel and I dialed for 2900fps but shot about 6" high. I haven't chronographed this load yet but by adjusting velocities on my ballistics app, I am in the ballpark of 2950-3000fps and I am beyond pleased with that. But what I am even more happy about is how well this load and rifle did at 100yds. Below is the picture of my 3 shot group at 100 yards. This beyond exceeded my expectations for the rifle and I am glad it's under .5 MOA now and from the looks of it, it will be a consistent sub-half MOA rifle. Keeping my fingers crossed that the 200gr ELD-X bullets will do this well!
