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Roy, I have some bc's.........

 
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  #1  
Old 04-07-2006, 11:25 PM
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Roy, I have some bc\'s.........

Ok, tested the .338 250 gr MK, the 252 Wildcat RBBT, and the 250 grain Lapua scenars today.

Temp was 59, elevation 4888, humidity 60%, baro 29.82, and no wind. All loads were loaded with 90.2 grains of RL22.

The Oehler 35 was set up 10 feet from the muzzle and a shooter chrony just after the Oehler. 3 test bullets were fired in this manner to see how close the chrono's were reading. Taking averages, we determined the Chrony was reading 17.3 fps faster than the Oehler.

Then we moved the Chrony out to the exact 100 yard mark and shot the bullets.

<font color="blue"> The Scenars avged 3084 muzzle and 2960 at 100 yards for a total slow down of 124 fps. This equates to a bc of .667 average. </font>


<font color="red"> The 250 MK's averaged 3040 at the muzzle and 2906 at 100 yards for a loss of 134 fps which equates to a bc of .610 (just like I guessed last week!) </font>



<font color="green"> The 252 RBBT wildcats clocked 3020 average at the muzzle and 2868 at 100 yards for a slowdown of 152 fps for a bc of .534. </font>


So, the Scenars are advertised right on for bc. The MK's are rated quite conservatively at .587, and the Wildcats were less than expected.

There's the straight poop with no sugar coating! Hope it helps with your decision making. [img]/ubbthreads/images/graemlins/wink.gif[/img]

Oh, and BTW, the MK's put them in the same hole at 100!
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Old 04-08-2006, 09:37 AM
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Re: Roy, I have some bc\'s.........

GG,

Were those the 252 gr ULD RBBTs with the lead right to the tip and a wide meplat? I have some of these as well and suspect the wide meplat is the reason for the lower then expected BC. These are big game bullets, not match bullets like the other two you tested, so for that use, its a pretty decent BC.

Good information!!

Kirby Allen(50)
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Old 04-08-2006, 10:40 AM
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Re: Roy, I have some bc\'s.........

GG,

Good deal. That'll save some shooting &amp; guessing on my end. It's about what I expected. But I had no way of getting a starting measurement.

Are there any other things that you can do for me? [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]

Kirby:
Yep, those are the ones. The tip has slightly greater angle than the ogive and lead goes to the tip.

With the way they shot in my Win, a bc on that order, the RUM velocities with the new bbl and the anticipated terminal performance I see no problem whatever being able to make a clean 'harvest' across the canyon....
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Old 04-08-2006, 04:01 PM
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Re: Roy, I have some bc\'s.........

GG, i'm kinda curious about the chrony. it was a little faster but how consistant was it?
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Old 04-08-2006, 05:59 PM
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Re: Roy, I have some bc\'s.........

I've been considering the wildcat bullets, but with no BC data I was hesitant to buy a batch. Any way you could throw some more wilcats of different weights in 338 caliber thru those chrono's? I only have axcess to 1 myself, otherwise I would do the same. Thanks
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Old 04-08-2006, 09:31 PM
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Re: Roy, I have some bc\'s.........

[ QUOTE ]
These are big game bullets, not match bullets like the other two you tested, so for that use, its a pretty decent BC.

[/ QUOTE ]


True. But the 225 accubond is roughly the same bc and it will go faster.
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Old 04-08-2006, 09:33 PM
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Re: Roy, I have some bc\'s.........

[ QUOTE ]
Are there any other things that you can do for me?


[/ QUOTE ]

Well, just name it!

BTW, I tested some more 250 MK's that I bought today and they came out at .615 so it seems to be pretty close to your lot. Good bullets.
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