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Compressed Loads

16 Nov 2015
@ 06:22 pm (GMT)

Ben Grady

Hi Guys

I am nearly back to load development for my 25-06 after an elbow operation.
I am going to try different seating depths with my projectiles.
In one reloading book it indicates I may be near a compressed load with my powder charge (Another reloading book doesn't) I guess this depends on the seating depth as well. Looking in the case full of powder there seems to be enough of a gap at the shoulder. With the bullet seated, the powder rattles in the case when shaken. The rattling of the powder makes me think it is not a compressed load yet? Is this a suffice way to tell as I seat the bullet deeper.
The reason I am concerned is I have read pressures can jump with a compressed load. I am 1/2 gr below book max, no pressure signs showing on fired cases. As I seat deeper if I cannot hear the powder rattling I would expect the bullet is compressing a load. Is my theory correct and safe.

cheers Ben[b]


16 Nov 2015
@ 07:22 pm (GMT)

Chris Murphy

Re: Compressed Loads
Hi Ben as you seat deeper pressure will drop with more bullet jump i don't think you will have any problems with compressed loads just watch for pressure signs.
16 Nov 2015
@ 09:16 pm (GMT)

Martin Taylor

Re: Compressed Loads
I run many compressed loads Ben with no problems and none of them are over book max, though l have checked many above.

Some, like my 308 using 2208 l can feel the powder compressing or moving as l seat the pill, these are still inside book max and shoot as well as my 2206H loads which are at about 90% case fill.

As Chris has said you shouldn't have to many issues. Whilst you are developing the seating & powder charge maybe back off your loads a little and re-test up to your max again until you have a good understanding of what your changes are doing to timing, pressures & speeds etc.

I have found the smaller the case the greater the effect will be. Like in the 204 Ruger with it's already cramped & heavily loaded case. The larger cases like the 06 and bigger seem to be much less effected by subtle changes.
Chris if you haven't already read it Nathans covers this in depth in the Reloading book explaining the relationship and effects of one thing to another
much better than l ever could.



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