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264Magic
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bit of testing
Nov 13th, 2017 at 11:21am
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a bit unhappy with the speed and pressure sign with the 125 partitions using 2219 so went to a different powder,,rl15 in this case as slower might be better in this phase
got to 29.9 and speed started to fall of(less than 29.8)
went to 30 gr and less again??any ideas out there??
am happy at 29.8 with no pressure(look out you big bad bulls)
  

It is much better to Hit the Animal in the right place, with a Rifle you can shoot well, then to hit it poorly with a Large Calibre..John Nosler
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Mathias
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Re: bit of testing
Reply #1 - Nov 13th, 2017 at 11:58am
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Was there any chance that the temperature of those loaded rounds decreased while you were doing the crony run? With long range shooting, shooters tend to try & keep their rounds at a steady temp to avoid variation in speed.
  
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Re: bit of testing
Reply #2 - Nov 13th, 2017 at 7:35pm
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I've run into that in a .308 you have reached the limit of how much gas can go up the barrel you have a bottle neck that slows the gas flow down, try a slightly faster powder may help
  
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Re: bit of testing
Reply #3 - Nov 17th, 2017 at 6:42am
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Hello - you're running a 6.5x39 or something like that right?
  (I looked over your posts when looking for ideas for my "truck gun")

How many rounds did you chrony in each weight - if its only 3 or so (like I usually do) its possibly only a statistical blip, for a decent average 5-10 is better.  if you want me to run your combinations on Quickload send me the cartridge, the case capacity of a fired case filled with H2O to level with the neck, the overall cartridge length and barrel length.  It'll give you plenty of ideas to try.

cheers
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Re: bit of testing
Reply #4 - Nov 17th, 2017 at 8:04am
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ArmedTramper wrote on Nov 17th, 2017 at 6:42am:
Hello - you're running a 6.5x39 or something like that right?
  (I looked over your posts when looking for ideas for my "truck gun")

How many rounds did you chrony in each weight - if its only 3 or so (like I usually do) its possibly only a statistical blip, for a decent average 5-10 is better.  if you want me to run your combinations on Quickload send me the cartridge, the case capacity of a fired case filled with H2O to level with the neck, the overall cartridge length and barrel length.  It'll give you plenty of ideas to try.

cheers
Foster


txks for that but its beyond my skills
  

It is much better to Hit the Animal in the right place, with a Rifle you can shoot well, then to hit it poorly with a Large Calibre..John Nosler
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Re: bit of testing
Reply #5 - Nov 17th, 2017 at 4:18pm
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I can't recall what cartridge you are shooting but let me know and and I can run it without the complicated stuff, it just won't be as accurate with the velocities.
  
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Re: bit of testing
Reply #6 - Nov 17th, 2017 at 7:39pm
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.204 ruger necked up to 6.5mm.....
  
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Re: bit of testing
Reply #7 - Nov 17th, 2017 at 8:10pm
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I can't recall what cartridge you are shooting but let me know and and I can run it without the complicated stuff, it just won't be as accurate with the velocities.
  
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Re: bit of testing
Reply #8 - Nov 17th, 2017 at 8:42pm
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Oops - sorry about the double post.  Hmmm - 6.5/204 is a bit of a problem without the case capacity.

Its is pretty straightforward to get case capacity, you weight a case fired in the rifle, then fill it with water (use a syringe or something to ensure there are no air bubbles).  Strike the water off flush with the case mouth and weight again.
  
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Re: bit of testing
Reply #9 - Nov 17th, 2017 at 8:49pm
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hmmmm the 6x47 will handle/use win 748 (and thats the closest cartridge I can find book data for)...... Ive got some here if you want to try it Bud Wink
  
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