Who says ADI max loads are soft

.5 gr below max for a bullet 1gr lighter with the same profile!

Attachment 18521

Because a computer prediction is always the best indicator of pressure right:D

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Originally Posted by veitnamcam

Because a computer prediction is always the best indicator of pressure right:D

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Not pictured: removing case from the chamber with a cleaning rod. Chronograph speed 14fps off from QL prediction.

http://i58.photobucket.com/albums/g2...psvdhxxy1p.jpg

Nicely trimmed finger nails (although the whitlows could do with some attention).

Does that really say 12.5 barrel?

At least the new data layout on the ADI site has the projectiles listed.

Some calibres are fine others are way low ie 7mmRem mag, others can be a little hot.

I guess it comes down to chamber/brass dimensions & powder lot.

Ok looks warm:D
hence importance of working up and recognising pressure signs .

Some adi loads are soft tho.

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Originally Posted by Tahr

Does that really say 12.5 barrel?

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Of course.

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Originally Posted by Kiwi Greg

At least the new data layout on the ADI site has the projectiles listed.

Some calibres are fine others are way low ie 7mmRem mag, others can be a little hot.

I guess it comes down to chamber/brass dimensions & powder lot.

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I got my data from an old ADI book, although the max load listed on the ADI site (not in the book) is still likely too hot.

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Originally Posted by veitnamcam

Ok looks warm:D
hence importance of working up and recognising pressure signs .

Some adi loads are soft tho.

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Halfway between start and max load... Max load works out about 79,000 psi

I thought we established a couple of years ago that 80k psi is fine. You just need some hard lapua brass and all will be good.

And pressure gear wasn't reliable. .. . .


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Originally Posted by L.R

I thought we established a couple of years ago that 80k psi is fine. You just need some hard lapua brass and all will be good.

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I thought it was established that we can't measure chamber pressure accurately and etc etc, don't recall any conclusion


Regardless I'm not shooting Lapua brass through an AR to be lost in the grass, the system has weaker extraction than a bolt gun, higher pressures aren't great for the longevity of the gun, and SAAMI max for 5.56x45 is 62,300psi or so, and book loads are vaguely meaningless due to variances in pretty much everything involved

So in short, I have no point here but I'm backing this off half a grain and re-testing

Adi 2225 in 300rum max load 100.5 behind a 180 grainer seems very warm looking at a couple of cases I acquired... they will be getting pulled

It's likely the internal volume of the brass coming into play. My friend has done a lot of load development with RG, it gets warm faster than FNB and I can't remember what else. The primer pockets on RG are cunty.

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Originally Posted by gimp

I thought it was established that we can't measure chamber pressure accurately and etc etc, don't recall any conclusion


Regardless I'm not shooting Lapua brass through an AR to be lost in the grass, the system has weaker extraction than a bolt gun, higher pressures aren't great for the longevity of the gun, and SAAMI max for 5.56x45 is 62,300psi or so, and book loads are vaguely meaningless due to variances in pretty much everything involved

So in short, I have no point here but I'm backing this off half a grain and re-testing

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Yea I was only taking the piss. You are right it is pointless to shoot lapua brass in an AR and even more pointless to drive it to the point of troublesome extraction. If you wanted more speed you wouldn't start by cutting the barrel to 12.5".