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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Fps and computer issue- advice please
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<blockquote data-quote="BrentM" data-source="post: 850527" data-attributes="member: 61747"><p>I have a Kestrel 2500, Leica 1600, and a Garmin Rhino 655T. I use absolute baro and rarely use the GPS. The Leica gives me absolute so I tend to use it exclusively. </p><p> </p><p>I find it strange that my 6.5-284 appears to be shooting 3000 FPS at these elevations. I had to pull .5 MOA at 1000 to 1500 at a different location and now 1 moa at this location. Granted the further I shoot the more the MOA difference, I get that. I am just surprised. I am shooting the last of the same lot of bergers but I think this last lot of retumbo might be a bit faster, even though the lot number is the same. </p><p> </p><p>I am new to all this so seeing a speed increase of 30 fps seems strange given this rifle for the past 300 rounds has been dead on with 2970 as the shooter profile speed. I had not sent rounds at the higher elevations and struggle to see the correlation. The pressure at this site was 22.05 and 55 degrees. </p><p> </p><p>I am headed back up to this area this weekend to wolf hunt and want to send some more lead at that rock from the same spot. I was not impressed with my group at all at 1540. The wind was minimal but one round it was blowing the dust up the draw, the next round it was blowing it down the draw. At 1300 the bullet was 200 fps faster and deadly.</p><p> </p><p>Second question, is a 140 grain bullet at less than 1500 fps tumbling? My rifle is 1:8 twist.</p></blockquote><p></p>
[QUOTE="BrentM, post: 850527, member: 61747"] I have a Kestrel 2500, Leica 1600, and a Garmin Rhino 655T. I use absolute baro and rarely use the GPS. The Leica gives me absolute so I tend to use it exclusively. I find it strange that my 6.5-284 appears to be shooting 3000 FPS at these elevations. I had to pull .5 MOA at 1000 to 1500 at a different location and now 1 moa at this location. Granted the further I shoot the more the MOA difference, I get that. I am just surprised. I am shooting the last of the same lot of bergers but I think this last lot of retumbo might be a bit faster, even though the lot number is the same. I am new to all this so seeing a speed increase of 30 fps seems strange given this rifle for the past 300 rounds has been dead on with 2970 as the shooter profile speed. I had not sent rounds at the higher elevations and struggle to see the correlation. The pressure at this site was 22.05 and 55 degrees. I am headed back up to this area this weekend to wolf hunt and want to send some more lead at that rock from the same spot. I was not impressed with my group at all at 1540. The wind was minimal but one round it was blowing the dust up the draw, the next round it was blowing it down the draw. At 1300 the bullet was 200 fps faster and deadly. Second question, is a 140 grain bullet at less than 1500 fps tumbling? My rifle is 1:8 twist. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Fps and computer issue- advice please
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