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300 wby pressure signs

 
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  #8  
Old 04-21-2012, 08:05 PM
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Join Date: Dec 2008
Posts: 13
Re: 300 wby pressure signs

thanks.
i am using this info from the net.

Long-Range Load Development

my first step is to determine max load.
accuracy comes in when you do the ladder and find the sweet spot.
im just trying to find my max and work back from there to find the spot.
all the data iv looked at was maxed out about 3 grains ago. lol.
iv got about a .130 thou run at the lands before contact.
should i be using a longer, heavier bullet so it can get closer to the lands or is the extra wby freebore ok with most bullets?
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  #9  
Old 04-21-2012, 08:14 PM
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Join Date: Jan 2011
Posts: 2,100
Re: 300 wby pressure signs

My match wbys only have .060" freebore, not the .360" avg a mk5 has, so no not all bullets work well, stick with SMKs and Amaxs. I had a 270wby that I always ran 6.5grns over book with no pressure in sight and great accuracy. Most data for wby cartridges is very conservative in case someone is loading for one that doesn't have the "standard" wby freebore.
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  #10  
Old 04-21-2012, 10:32 PM
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Join Date: Mar 2012
Posts: 18
Re: 300 wby pressure signs

I have found book specs for COAL (3.562") gives me the best accuracy with my 3oobee, no matter the bullet/powder combo.
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  #11  
Old 04-22-2012, 06:04 PM
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Join Date: Dec 2008
Posts: 13
Re: 300 wby pressure signs

update.
i loaded up 15 more and maxed out at 84 grs. first test was 82 grs. then .5 gr intervals. i got one with an extractor mark and one of the 3 was just a tad hard to open so im right on max at 84 grs. of imr 7828. case stretch at belt was .516". now i can load up some at 83 and down to start my ladder. i chronographed them all and got an average speed from the 3 shots at max load of 3075 fps. thanks fellas!
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