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.243win 75g vmax help

 
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  #1  
Old 07-07-2013, 08:34 PM
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Join Date: Nov 2011
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.243win 75g vmax help

Im trying the 75vmax out. I have them loaded with 46.6g of h4350 @2.64"

The 100 yard ground is inside a half inch. I moved back to 300yrds. Turned it up 3 moa and the fist shot hit 2" right and and 1" low of the center on my 10" plate. The 2nd shot was an inch right. The next two shots were at some rocks. Both of those shots connected..the 3 moa I got from my ballistic app with MV @3200. Scope hight is 2". I shot 400yards today and made contact with the same plate 4" hight 4" right. It was a little breezy. My app called for 5.45moa up.. I shoot and it hits center but way high. I dieled down 4 clicks and missed about 4" lower then the 1st shot... I made contact on the plate at 3.75moa u from my 100yd zero...the hit was about 4" high of center of the plate...


Here's my question. I am getting a bass MV from the reload manual but so far it isn't adding up... I don't have a crono, I'm shooting a 26" 1:10. Can anyone give
Me a better estimate on my MV. I know I need to shoot
More then 3 rounds to validate this test. I'm going to check my 100yrd zero tomorrow to rule out that.
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  #2  
Old 07-08-2013, 11:48 AM
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Join Date: Sep 2009
Location: South Dakota
Posts: 397
Re: .243win 75g vmax help

Quote:
Originally Posted by 1tonpower View Post
The 100 yard ground is inside a half inch. I moved back to 300yrds. Turned it up 3 moa and the fist shot hit 2" right and and 1" low of the center on my 10" plate. The 2nd shot was an inch right. The next two shots were at some rocks. Both of those shots connected..the 3 moa I got from my ballistic app with MV @3200. Scope hight is 2". I shot 400yards today and made contact with the same plate 4" hight 4" right. It was a little breezy. My app called for 5.45moa up.. I shoot and it hits center but way high. I dieled down 4 clicks and missed about 4" lower then the 1st shot... I made contact on the plate at 3.75moa u from my 100yd zero...the hit was about 4" high of center of the plate...


Here's my question. I am getting a bass MV from the reload manual but so far it isn't adding up... I don't have a crono, I'm shooting a 26" 1:10. Can anyone give
Me a better estimate on my MV. I know I need to shoot
More then 3 rounds to validate this test. I'm going to check my 100yrd zero tomorrow to rule out that.
With a 26" barrel, I'm betting your shooting WAY faster than 3200.

Get a bigger piece of paper. 24"x36" tag board works well.

Take it out to about 7-800 yds and figure your drop. Dial, and see where you actually impact.
Figure out what you would have to have for an ACTUAL velocity in order to be on target, move in closer to about 300 yds and check again with your new velocity as a standard.
If it doesn't match up, then your BC data is slightly skewed.
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  #3  
Old 07-08-2013, 12:41 PM
B23 B23 is offline
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Join Date: Oct 2008
Location: Spokane, Wa.
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Re: .243win 75g vmax help

FWIW, using your load info, QuickLoad says 3447fps and that you're on the high end of pressure.
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  #4  
Old 07-08-2013, 12:59 PM
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Join Date: Feb 2011
Location: Cincinnati, Ohio
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Re: .243win 75g vmax help

Hodgen's chart says that with H4350 and 40.7 grains of it your at 4183 FPS and.....58,500 pressure....!!!!!

AT 46 grains your REALLY pushing it
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  #5  
Old 07-08-2013, 02:09 PM
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Join Date: Nov 2011
Posts: 232
Re: .243win 75g vmax help

I got the load data from hornady's 8th edition. According to the book I'm a tenth under max. I did start low before I got this high. Bolt lift is easy and no primer cratering. Thanks for the responses. I will look over my spent cases from today to double check.
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  #6  
Old 07-08-2013, 03:26 PM
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Re: .243win 75g vmax help

deleated

Last edited by Sully2; 07-08-2013 at 05:21 PM.
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  #7  
Old 07-08-2013, 04:19 PM
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Re: .243win 75g vmax help

Quote:
Originally Posted by Sully2 View Post
I have the 9th edition and it doesnt even list H4350 AT ALL.???
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