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Long Range Hunting & Shooting
Help calculating a BC from two speeds
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<blockquote data-quote="aroshtr" data-source="post: 168187" data-attributes="member: 9176"><p>I got a chance to shoot last night at 800 yards. It appears that I was hitting about 4" low with the group average. It was about 20 degrees cooler than when I sighted in and the chart I had was for 60 degrees, (it was about 40 degrees last night). The BC I used for this table was .530, and with the cooler weather the 4" low should be about right. My guess is I might give .525 a try.</p><p> </p><p>I guess it is all for not though as it is not grouping very well at all. I had a friend tell me that these very low drag bullets sometimes don't group well at closer ranges, but stabalize and group well at longer ranges. In this case it is not true. It was grouping about 1.75-2.00" at 200 yards, and last night my 7 shot group at 800 yards was about 16-17". I would estimate my actual hold at that distance to be about 4", so you could subtract that from the group size, but it is still way over 1 moa. I am sure I could do a little more with my load work-up (seating depth, powder charge, etc.) but it seems that the bullets are getting worse at longer ranges.</p><p> </p><p>My Nolser 140 accubond load I have been using averages about .5to .6 moa up close (100-200), and 1 moa at the longer distances (600-800). The BC I use with this bullet is about .490. I was really hoping that the wlidcat bullet would group so I could have a heavier better BC bullet, but I am not going to give up much accuracy to get it. The other reason I wanted to switch bullets is that the accubond is so hard and well built that I am blowing through my deer at 600 yards with small exit holes. On a chest hit the damage is not as much as I want.</p><p> </p><p>I have been waiting for Berger to put out a 270 bullet for over 6 months, and they keep pushing back the release date. I might give it a try when the do finish them I guess.</p><p> </p><p>If anyone wants to try the .277 ULD rebated Boattail bullet I have an extra box of 100 that might be for sale... LOL<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p> </p><p>Joel</p></blockquote><p></p>
[QUOTE="aroshtr, post: 168187, member: 9176"] I got a chance to shoot last night at 800 yards. It appears that I was hitting about 4" low with the group average. It was about 20 degrees cooler than when I sighted in and the chart I had was for 60 degrees, (it was about 40 degrees last night). The BC I used for this table was .530, and with the cooler weather the 4" low should be about right. My guess is I might give .525 a try. I guess it is all for not though as it is not grouping very well at all. I had a friend tell me that these very low drag bullets sometimes don't group well at closer ranges, but stabalize and group well at longer ranges. In this case it is not true. It was grouping about 1.75-2.00" at 200 yards, and last night my 7 shot group at 800 yards was about 16-17". I would estimate my actual hold at that distance to be about 4", so you could subtract that from the group size, but it is still way over 1 moa. I am sure I could do a little more with my load work-up (seating depth, powder charge, etc.) but it seems that the bullets are getting worse at longer ranges. My Nolser 140 accubond load I have been using averages about .5to .6 moa up close (100-200), and 1 moa at the longer distances (600-800). The BC I use with this bullet is about .490. I was really hoping that the wlidcat bullet would group so I could have a heavier better BC bullet, but I am not going to give up much accuracy to get it. The other reason I wanted to switch bullets is that the accubond is so hard and well built that I am blowing through my deer at 600 yards with small exit holes. On a chest hit the damage is not as much as I want. I have been waiting for Berger to put out a 270 bullet for over 6 months, and they keep pushing back the release date. I might give it a try when the do finish them I guess. If anyone wants to try the .277 ULD rebated Boattail bullet I have an extra box of 100 that might be for sale... LOL:D Joel [/QUOTE]
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