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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New Hammer range test
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<blockquote data-quote="RockyMtnMT" data-source="post: 1276423" data-attributes="member: 7999"><p>We were able to get good data with the 195g 30cal yesterday. The .277 did not give us consistent enough data to feel conclusive. We could not see impacts on rock face at 1280y and it was starting to snow.</p><p></p><p>We got good hits on rocks at 700y, 975y, and 1280y with the 195g .308. Based on our drops we calculate the G7 BC to be .312 and G1 BC to be .65. Very happy with these results. Puts us right there with other top end bullets for bc performance. We were shooting a 4200' elev with a 30-338 Lap imp. Here are the data points used for calculations. The 1280y impacts were the best as we had a very good aim point that both shooter and spotter could make out well. The two closer ranges were slightly more ambiguous. </p><p></p><p>Rifle was zeroed at 200y, 3500fps at muzzle ave, 3000' elev (did not collect baro pressure)standard atmosphere, 35*F, 50% humidity. Barrel is a 9" twist.</p><p></p><p>Yesterday data: 4200' elev, 25.22Hg, 25*F, 50% humidity, very light wind.</p><p></p><p>700y target dialed 8.5 MOA, 975y dialed 15.25 MOA, 1280y dialed 23 MOA. The 1280 rock had a nice smooth face with a good aim point and able to see impacts very well.</p><p></p><p>All three targets held sub moa impacts very nicely. Any of you want to run the numbers and come up with different data let us know. Our biggest goal with the whole bc thing is to get it close enough for people to get on target and then make their own adjustments. Last thing we want to do is exaggerate things.</p><p></p><p>We will be trying this same design in the .338 and .375 very soon. Also sending some in 7mm to a friend to test as we do not have on hand a fast enough twist 7.</p><p></p><p>Steve</p><p></p><p>Read more: <a href="http://hammerbullets.boards.net/thread/43/new-hammer-range-test?page=1#ixzz4WVzG3nfy" target="_blank">New Hammer range test | Hammer Time</a></p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 1276423, member: 7999"] We were able to get good data with the 195g 30cal yesterday. The .277 did not give us consistent enough data to feel conclusive. We could not see impacts on rock face at 1280y and it was starting to snow. We got good hits on rocks at 700y, 975y, and 1280y with the 195g .308. Based on our drops we calculate the G7 BC to be .312 and G1 BC to be .65. Very happy with these results. Puts us right there with other top end bullets for bc performance. We were shooting a 4200' elev with a 30-338 Lap imp. Here are the data points used for calculations. The 1280y impacts were the best as we had a very good aim point that both shooter and spotter could make out well. The two closer ranges were slightly more ambiguous. Rifle was zeroed at 200y, 3500fps at muzzle ave, 3000' elev (did not collect baro pressure)standard atmosphere, 35*F, 50% humidity. Barrel is a 9" twist. Yesterday data: 4200' elev, 25.22Hg, 25*F, 50% humidity, very light wind. 700y target dialed 8.5 MOA, 975y dialed 15.25 MOA, 1280y dialed 23 MOA. The 1280 rock had a nice smooth face with a good aim point and able to see impacts very well. All three targets held sub moa impacts very nicely. Any of you want to run the numbers and come up with different data let us know. Our biggest goal with the whole bc thing is to get it close enough for people to get on target and then make their own adjustments. Last thing we want to do is exaggerate things. We will be trying this same design in the .338 and .375 very soon. Also sending some in 7mm to a friend to test as we do not have on hand a fast enough twist 7. Steve Read more: [url=http://hammerbullets.boards.net/thread/43/new-hammer-range-test?page=1#ixzz4WVzG3nfy]New Hammer range test | Hammer Time[/url] [/QUOTE]
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