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Pressure signs...now what

 
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  #1  
Old 08-14-2014, 05:54 PM
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Pressure signs...now what

I just started working a load for my 300wsm using 200gr accubonds and h4350. Book max is 62.5grains for imr4350. Hodgdon website says 62gr for max with a 200gr bullet so I followed that. I first wanted to determine my rifles max load. I loaded a 60,60.5,61,61.5,62. The 60, 60.5 and 61gr loads all shot fine. Then I hit 61.5. I noticed a nice mark from the extractor on the case bottom and was told this is a sign of excess pressure so I did not fire the 62gr. Now what do I do?
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Old 08-14-2014, 06:00 PM
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Re: Pressure signs...now what

Do I back off a grain...down to 60.5...more...less...thanks!
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Old 08-14-2014, 06:01 PM
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Re: Pressure signs...now what

Chronograph it at 60- 61 grs and see where your velocity is at .Then shoot some groups to see if you are happy with accuracy. If things don't line up where you want them too switch powders like RL17 or RL19.
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Old 08-14-2014, 06:01 PM
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Re: Pressure signs...now what

Usually I back off 1 gr and start accuracy testing and seating depth adjustments from there. That would put it at 60.5 gr. That happens to be the most accurate load tested by Nosler for IMR4350 and the 200 gr Accubond. So maybe you are close to a sweet spot.
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Old 08-14-2014, 06:12 PM
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Re: Pressure signs...now what

Quote:
Originally Posted by highridge1 View Post
Chronograph it at 60- 61 grs and see where your velocity is at .Then shoot some groups to see if you are happy with accuracy. If things don't line up where you want them too switch powders like RL17 or RL19.
Quote:
Originally Posted by Barrelnut View Post
Usually I back off 1 gr and start accuracy testing and seating depth adjustments from there. That would put it at 60.5 gr. That happens to be the most accurate load tested by Nosler for IMR4350 and the 200 gr Accubond. So maybe you are close to a sweet spot.
I got about 2700fps at 60.5gr which is definitely not top end for velocity but will be fine for the purpose of this load. 300yard deer/elk load.
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Old 08-14-2014, 07:16 PM
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Re: Pressure signs...now what

Nosler manual states 2775 for the 60.5 gr load. They tested in a 26 inch barrel. If you are shooting a 24 inch barrel, seems 2700 would be about right.

Highridge 1 is right. R17 will make it scream.
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Old 08-14-2014, 08:23 PM
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Re: Pressure signs...now what

Quote:
Originally Posted by Barrelnut View Post
Usually I back off 1 gr and start accuracy testing and seating depth adjustments from there. That would put it at 60.5 gr. That happens to be the most accurate load tested by Nosler for IMR4350 and the 200 gr Accubond. So maybe you are close to a sweet spot.
+1. This is what I'd do.
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