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Old 10-08-2005 | 03:09 AM
  #37  
dmurphy317
Nontypical Buck
 
Joined: Aug 2005
Posts: 1,081
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From: New Mexico
Default RE: which is more powerful?

Here is the information you guys are discussing in regards to my numbers.

My gun is a factory stock Winchester 70 with a 26" barrel. The shooting results were from an F-1 Beta (I think, it belongs to a friend) measured at 15 feet in front of the muzzle. Tests were done at 6500 feet ASL with a temperature of around 80 degrees. The friend with the chrony was testing the same basic load in his Rem 700 with a 24" barrel and was getting about 120 to 170 fps less than I was. The ballistics program I use is the Point Blank program which is available on the web. It may not be perfect but so far my shooting results at various ranges out to 200 yards have been nearly identical to the calculated results of the program.

The results I posted were based on the velocities I recorded but with the altitude adjusted to 1000 feet since that is the elevation mentioned in an earlier post. At 6500 feet the 140 load calculates 2076fpe at 500 yards. That is based on the Point Blank program using .485BC, 140GR BT at 3350fps, 70 degrees. My neck sized only cases will hold about 74 to 75gr of 7828. The load uses 71.5gr of 7828 and a CCI LRM primer.I had tried the Win LRM primers but the velocity spreads were larger and the CCI's gave me tighter spreads and on average about 15fps more velocity.

The 160 Accubond load I am still working up. The posted info was based on 3200fps, all else was the same except the BC. I also have a load for the 175 Corlokt(?) that averages about 3000fps using 69.5gr of 7828. At 450 yards it still has 2100fpe, again all else as stated.

I hope this answers your questions.
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