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Old May 18, 2018, 04:58 PM   #15
HiBC
Senior Member
 
Join Date: November 13, 2006
Posts: 5,924
You get all sorts of opinions on the internet.

A few individuals post with great confidence,and a self proclaimed noob might believe them. Be careful . Use your own head to take care of yourself.

THIS LOAD IS OUTDATED<OBSOLETE<AND DANGEROUS<DON"T USE IT.

Long ago,both Sierra and Hogdon blessed as OK my load for a 7mm Rem Mag of 70 gr of H-4831 behind a 160 gr Sierra BT. At that time,PO Ackley was a column writer for American Rifleman.He estimated it would be about 65,000 psi.

once again,DO NOT USE THAT LOAD. Today,it really is a serious overload.

We usd to use the PO Ackley "Handbook for Shooters " as a viable source for load data.
It was useful in its day.
A friend's Dad built a Mauser 30-06 back in the day.His Dad's elk hunting buddy loaded all his ammo. Tha Dad asks the Old Loader to make some ammo so the son could use the rifle hunting.
My friend comes to me. " My Dad's '06 REALLY kicks. (I shrug) And it gets this black stuff inside and the primers fall out.Is it supposed to do that?"

My eyebrows go up. I say "Do not shoot any more of those.Find and account for all of them" Those pockets were splayed out,and case heads separated.

The Old Loader wrote the data down.It was a classic H-4895 load from the PO Ackley book. It was safe,in the day. But Hogdon Powder went from Surplus to Newly Manufactured. Same designation,as in "H-4895" .But maybe 10% reduction in charge weight.

That is an extreme example. But powders that were made in the USA are now made in Australia,or Sweden,or Switzerland,or who knows? In a different plant by different people.
Copper crusher pressure measurements have been replaced by more precise tech.
Powders have been made to burn cleaner or be more temperature tolerant or meter better. The recipe is changed while the name remains the same.

I'll say it again,your old books are still useful,but I strongly advise you supplement/verify the data against current ,on line data.

And don't be afraid to contact the manufacturer tech help.

Some more bad,untrue,and unsafe advice is that all bullets of the same weight will produce the same pressure.
Jacket thickness,hardness,length of bearing surface,base configuration,partitions,etc all have an effect on pressure.

Make note of who to give credibility.
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