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Old 11-01-2004, 11:17 PM
  #17  
handloader1
Nontypical Buck
 
Join Date: Feb 2003
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Posts: 3,516
Default RE: Ive Got Bad Problems With My .300 WBY

TexasAggieBowHunter:

If your rifle is set at 5" high at 100 yds., you are using what is called Maximum Point Blank Range (MPBR). According to "Ammo & Ballistics II a Hornady 180 gr. Pointed-Expanding bullet should be travling at 3240 f/s". I was not able to find a Weatherby 180 gr. BTSP factory ammo data, but I used the BC for a Hornady BTSP which is .452, and the velocity of 3240 f/s. If you are 5" high at 100 yds. at 200 yds. 7.9", at 229 yds. 8.0", at 300 yds. 6.4", at 400 yds. -4.0", at 465 yds. -8.0", and at 500 yds. -13.2". The kill zone (MPBR) on a Mature Bull Elk is 8.0". Which means your bullet can hit a mature bull elk 8.0" above the line of sight, and 8.0" below the line of sight, and you will be within the kill zone (MPBR). In theory, the way your rifle is sighted in your bullet will never travel higher than 8.0" high, but it will hit -8.0" at 465 yds., so you will have to compensate after 465 yds. If you see a Mature Bull Elk at 500 yds., you aim at the top of his back, and the bullet will drop into the kill zone. You must remember this is not exact because you are not shooting in a controlled enviorment (at sea level, no wind, flat terrain, etc.), and you do not know your actuall velocity. For this all to come together you must go to the range and test your rifle and your skill.

I use MPBR , but I use 7.0" for my MPBR on elk. Good luck.
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