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Need help with 2285 yard shot.
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<blockquote data-quote="Topshot" data-source="post: 355023" data-attributes="member: 13285"><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">I got up this morning and went out to the location just on day light for my first attempt at this distance with my .338 Edge. Short story, 9 shots over an hour, no hits. But got very close and learned a heap.</span></span></p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Bullet 300 gn SMK, M.V. used 2790 fps, This is a good load and shoots very tight in elevation at 1000 yards. Temp was 14 deg C, pressure 994 mb, wind about 5mph? coming from 5 o'clock.</span></span></p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">First lesson. My version of Exbal for PDA doesn't work past 2000 yards so had to use Exbal P.C. version and also JBM ballistics.</span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Decided to go with the Litz, G7 data which seemed to work in quite well. (There is about 5 MOA of difference between Litz G7 drop data and Sierra G1 drop data at this range). Using G7 data gave me a figure of 120 MOA elevation. And I used "Point Mass" to get Coriolis and Spin drift data of 44" right drift.</span></span></p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">The first shot, I dialed in 50 MOA on the elevation turret to avoid the extreme end of the scope travel adjustment. Doing this would also give me some room to move if I needed it.</span></span></p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">No input for wind or drift as I hoped they might cancel each other out. I then set the scope at 5.5 power and held 2.5 segments above the bottom of the vertical line on the R1 reticle. This gave me 120 MOA in total. See photo. (Camera is tilted not scope)</span></span></p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px"> <img src="http://members.optusnet.com.au/~wadcutter/mypic38.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></span></p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">I fired the first shot with a clean cold bore and waited the 4.6 seconds for the bullet to get to the target. This is a long time! And I was amazed that I could actually see the dust fly from the bullet impact, even on 5.5 power. I was also amazed that the bullet actually landed very close to the target! Impacting spot on for level with the target but about 3 MOA left.</span></span></p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">I then dialed 3 MOA right and fired two more shots. Both these shots landed just left of the target but about 2 MOA over the top.</span></span></p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">I then let the barrel cool for a while and dialed down 1 MOA lower. A three shot group followed with two bullets just going over the target and one falling about 10 yards below the target. I then drove up to the target to see what was going on.</span></span></p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">After looking at the impact points I had two thoughts. (1) That I needed to shoot a bit lower and (2) that maybe the bullets were not going through the trans sonic barrier too well.</span></span></p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">I then went back to the start, by this time the breeze had dropped a bit but I decided to ignore that as it was switching a bit as well. I then dialed down another 1 MOA and fired another three shot group. </span></span></p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">One went just over the target, one was level with the target but just right and the last fell in line with the target but just low.</span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><img src="http://members.optusnet.com.au/~wadcutter/mypic39.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></span></p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Conclusions. 118 MOA seems to be the drop I need. Litz G7 data is a bit closer to the mark than the Sierra G1 B.C. </span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">The bullets that land high seem to group well together but any that land low could land anywhere. i.e. </span></span><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Some bullets seem to be becoming unstable as they go sub-sonic.</span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">2285 yards is a bloody long way when shooting on 5.5 power.</span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">I need to try this again as it is a lot of fun.</span></span></p><p> </p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'">Photo below. At first light, waiting for enough light to shoot.</span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Times New Roman'"><img src="http://members.optusnet.com.au/~wadcutter/mypic37.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></span></span></p></blockquote><p></p>
[QUOTE="Topshot, post: 355023, member: 13285"] [SIZE=3][FONT=Times New Roman]I got up this morning and went out to the location just on day light for my first attempt at this distance with my .338 Edge. Short story, 9 shots over an hour, no hits. But got very close and learned a heap.[/FONT][/SIZE] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [SIZE=3][FONT=Times New Roman]Bullet 300 gn SMK, M.V. used 2790 fps, This is a good load and shoots very tight in elevation at 1000 yards. Temp was 14 deg C, pressure 994 mb, wind about 5mph? coming from 5 o’clock.[/FONT][/SIZE] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [SIZE=3][FONT=Times New Roman]First lesson. My version of Exbal for PDA doesn’t work past 2000 yards so had to use Exbal P.C. version and also JBM ballistics.[/FONT][/SIZE] [SIZE=3][FONT=Times New Roman]Decided to go with the Litz, G7 data which seemed to work in quite well. (There is about 5 MOA of difference between Litz G7 drop data and Sierra G1 drop data at this range). Using G7 data gave me a figure of 120 MOA elevation. And I used “Point Mass” to get Coriolis and Spin drift data of 44” right drift.[/FONT][/SIZE] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [SIZE=3][FONT=Times New Roman]The first shot, I dialed in 50 MOA on the elevation turret to avoid the extreme end of the scope travel adjustment. Doing this would also give me some room to move if I needed it.[/FONT][/SIZE] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [SIZE=3][FONT=Times New Roman]No input for wind or drift as I hoped they might cancel each other out. I then set the scope at 5.5 power and held 2.5 segments above the bottom of the vertical line on the R1 reticle. This gave me 120 MOA in total. See photo. (Camera is tilted not scope)[/FONT][/SIZE] [FONT=Times New Roman][SIZE=3] [IMG]http://members.optusnet.com.au/~wadcutter/mypic38.jpg[/IMG][/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [SIZE=3][FONT=Times New Roman]I fired the first shot with a clean cold bore and waited the 4.6 seconds for the bullet to get to the target. This is a long time! And I was amazed that I could actually see the dust fly from the bullet impact, even on 5.5 power. I was also amazed that the bullet actually landed very close to the target! Impacting spot on for level with the target but about 3 MOA left.[/FONT][/SIZE] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [SIZE=3][FONT=Times New Roman]I then dialed 3 MOA right and fired two more shots. Both these shots landed just left of the target but about 2 MOA over the top.[/FONT][/SIZE] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [SIZE=3][FONT=Times New Roman]I then let the barrel cool for a while and dialed down 1 MOA lower. A three shot group followed with two bullets just going over the target and one falling about 10 yards below the target. I then drove up to the target to see what was going on.[/FONT][/SIZE] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [SIZE=3][FONT=Times New Roman]After looking at the impact points I had two thoughts. (1) That I needed to shoot a bit lower and (2) that maybe the bullets were not going through the trans sonic barrier too well.[/FONT][/SIZE] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [SIZE=3][FONT=Times New Roman]I then went back to the start, by this time the breeze had dropped a bit but I decided to ignore that as it was switching a bit as well. I then dialed down another 1 MOA and fired another three shot group. [/FONT][/SIZE] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [SIZE=3][FONT=Times New Roman]One went just over the target, one was level with the target but just right and the last fell in line with the target but just low.[/FONT][/SIZE] [SIZE=3][FONT=Times New Roman][IMG]http://members.optusnet.com.au/~wadcutter/mypic39.jpg[/IMG][/FONT][/SIZE] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [SIZE=3][FONT=Times New Roman]Conclusions. 118 MOA seems to be the drop I need. Litz G7 data is a bit closer to the mark than the Sierra G1 B.C. [/FONT][/SIZE] [SIZE=3][FONT=Times New Roman]The bullets that land high seem to group well together but any that land low could land anywhere. i.e. [/FONT][/SIZE][SIZE=3][FONT=Times New Roman]Some bullets seem to be becoming unstable as they go sub-sonic.[/FONT][/SIZE] [SIZE=3][FONT=Times New Roman]2285 yards is a bloody long way when shooting on 5.5 power.[/FONT][/SIZE] [SIZE=3][FONT=Times New Roman]I need to try this again as it is a lot of fun.[/FONT][/SIZE] [SIZE=3][FONT=Times New Roman][/FONT][/SIZE] [SIZE=3][FONT=Times New Roman]Photo below. At first light, waiting for enough light to shoot.[/FONT][/SIZE] [SIZE=3][FONT=Times New Roman][IMG]http://members.optusnet.com.au/~wadcutter/mypic37.jpg[/IMG][/FONT][/SIZE] [/QUOTE]
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