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Rifles, Reloading, Optics, Equipment
Reloading
Loading Data for AR30A1 Armalite 300 Win Mag
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<blockquote data-quote="LR65Pb" data-source="post: 1062603" data-attributes="member: 89313"><p>Today was a good, long day of testing. For 6 hours I loaded and tested groups from .030 off the lands to .010 jammed, in .005 increments. At each of those increments, I used powder weights from 77.7 gr to 78.5 in mostly .1 gr intervals. This made for a lot of shooting and loading, but it was worth it. </p><p></p><p>Before starting, I fired 2 Factory Hornady 180 SST's through the chrony to verify it's data and it read 3111 and 3118 fps at the same 15' distance. Since the Armalite AR30A1 300 win mag uses the same magazine as the 338 Lapua, COAL can pretty much be anything and still have the 5 shot capacity mag. </p><p></p><p>Based on yesterdays results, I had an idea of what might work, but as it turned out, I picked up more velocity and at the same time, a tighter final group. I wrote down every shot and group which came in handy when at the end of the day, I decided to revisit the two tightest groups. One of those groups was at the starting charge weight of 77.7 and the other was at 78.4. One thing that became apparent during the testing was the gun liked having the bullet close to the lands. As I moved it in from .030, the groups generally got tighter. At the 77.7 gr and .003 off the lands, I shot a .25" group, with several in the .375 range (guestimated). By running the COAL to 3.635, just barely off the lands, maybe .001 at most, and using 78.4 grains of H1000, I had my best group of the day. Actually, it was only a 3 shot group at the end of the day, but I'll take it. When I looked at the Chrony on the second shot, I thought that it hadn't registered the shot because it was 2918, the same as the first shot. On top of that, the poi was right on top of the first shot. After verifying that the log did have two shots in the string, I loaded the 3rd cartridge. Again, the chrony showed the exact same velocity, 2918. I checked it again and it absolutely had 3 shots logged for a 3 shot average of 2918 and 0.00 and 0.00. No way did I think it was possible. Several times I had 2 of 3 shots in the same hole, but usually one of the 3 would deviate and I'd end up with a small gap between shots or a lightly touching clover leaf looking like 2 shots. The final group was quitting time and the 3rd shot barely opened up the 2 shot hole. At worst, a .125 moa. </p><p></p><p>I think all of the testing and running back and forth was worth it. My best group ever with a 15' velocity of 2918 fps using the 208 Amax, 78.4 gr of H1000, bullet seated right at the lands, multiple fired Hornady brass with a Fed Match Magnum 215M primer. </p><p></p><p></p><p>Thanks for all of the previous posts in other threads. It certainly has helped me get a grip on reloading again.</p></blockquote><p></p>
[QUOTE="LR65Pb, post: 1062603, member: 89313"] Today was a good, long day of testing. For 6 hours I loaded and tested groups from .030 off the lands to .010 jammed, in .005 increments. At each of those increments, I used powder weights from 77.7 gr to 78.5 in mostly .1 gr intervals. This made for a lot of shooting and loading, but it was worth it. Before starting, I fired 2 Factory Hornady 180 SST's through the chrony to verify it's data and it read 3111 and 3118 fps at the same 15' distance. Since the Armalite AR30A1 300 win mag uses the same magazine as the 338 Lapua, COAL can pretty much be anything and still have the 5 shot capacity mag. Based on yesterdays results, I had an idea of what might work, but as it turned out, I picked up more velocity and at the same time, a tighter final group. I wrote down every shot and group which came in handy when at the end of the day, I decided to revisit the two tightest groups. One of those groups was at the starting charge weight of 77.7 and the other was at 78.4. One thing that became apparent during the testing was the gun liked having the bullet close to the lands. As I moved it in from .030, the groups generally got tighter. At the 77.7 gr and .003 off the lands, I shot a .25" group, with several in the .375 range (guestimated). By running the COAL to 3.635, just barely off the lands, maybe .001 at most, and using 78.4 grains of H1000, I had my best group of the day. Actually, it was only a 3 shot group at the end of the day, but I'll take it. When I looked at the Chrony on the second shot, I thought that it hadn't registered the shot because it was 2918, the same as the first shot. On top of that, the poi was right on top of the first shot. After verifying that the log did have two shots in the string, I loaded the 3rd cartridge. Again, the chrony showed the exact same velocity, 2918. I checked it again and it absolutely had 3 shots logged for a 3 shot average of 2918 and 0.00 and 0.00. No way did I think it was possible. Several times I had 2 of 3 shots in the same hole, but usually one of the 3 would deviate and I'd end up with a small gap between shots or a lightly touching clover leaf looking like 2 shots. The final group was quitting time and the 3rd shot barely opened up the 2 shot hole. At worst, a .125 moa. I think all of the testing and running back and forth was worth it. My best group ever with a 15' velocity of 2918 fps using the 208 Amax, 78.4 gr of H1000, bullet seated right at the lands, multiple fired Hornady brass with a Fed Match Magnum 215M primer. Thanks for all of the previous posts in other threads. It certainly has helped me get a grip on reloading again. [/QUOTE]
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Loading Data for AR30A1 Armalite 300 Win Mag
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