What modern powder replaced Dupont #80 if any, thanks? Hank45

But don't use SR 80 data with 4759!

David

I have a letter from Ken Waters on the "Handloader"letterhead that identifies SR 80 as 4759's parent. Not the same powder but formulated to do the same job.  He said with appropriate caution data is interchangeable.  I always start low and work up, have found velocities in Sharps's for SR 80 Data to be roughly the same as actual using 4759

Of course pressure is what causes  trouble and no way for individuals to tell exactly what pressure is in there loads.

Boats

That's the year my book was written and published. Hank

Hank, reduce it 10% and work up to the number in the book.  You should find a shooter there, but I must caution about using #80 dope on 4759 loads, as far as I know #80 was the invention of Elmer Kieth, and most certainly not a factory offering at leas tuntil his death.  Use with caution.

Hank

My copy is a 1st 1937 signed "Yours for better loads" "Phil Sharpe". It was a junk copy falling apart I had re-bound in Leather.  The load manual I use more than any other.

I can recall a Elmer mentioning SR 80 in his books, but looked him up just now, born 1899 so guess he was not involved in the powders early production. Seems to me 2400 was his powder developed with the .357 Mag, can't say for sure.

To clarify how I use SR 80 Data.  New cartridge unknown to me like the 32/20 I started working with this fall.

Pick the bullet I want to use according to the barrel twist rifle  and the desired result on target. This case lead 115 gr at the old standard 32/20 rifle velocity of about 1250 fps

Then search all the available data new manuals and old manuals with powders of approximately the burn rate needed for that velocity. 32/20 looked like 4227 data was best of the current information with lots of old data for SR # 75 and SR # 80 Matten for example has both 4227 and SR # 80 data  Sharpe has SR 80 & SR 75 all with my chosen bullet.  Few new manuals too all with 4227 data. Asked a few guys I know what they use too. The standard velocity for factory 32/20 from Whelans book. There is a high speed load too, left that one out.

Then I plot recommend charges and velocity from half a dozen sources while noting pressure listed.  From my plot I make a educated choice on starting loads. Always modest loads, then work up at the range using the chronograph to get the desired velocity and result on target.

So it's probably not accurate to say it's OK to use SR 80 Data for 4759, it is useful to consult SR 80 Data when working up loads using new manufactured powder.

Open up a new manual they tell you very little, Lawyers have watered them down is my guess.

Boats

Probably, 2400 was developed about then. 

However powders change over the years, new Hodgen 4227 and Unique are a bit different than older powders from the original makers.  I just started a new plastic jug of Hodgen 4227 and need a full grain more powder in the 38/55 to get the same MV as my old IMR cans

Still best to work under recommended charges at first then work up carefully.   

Boats

thread on #80

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