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Posted: 8/22/2017 7:48:39 PM EDT
| Hey folks I found a hand loading book at a flea market Sunday, it's from 1981 and is a NRA publication. Picked it up as it has data for all the old mil cartridges you can't find data on anymore. Anyways it gives data for a lot of the old DuPont powder numbers. My question is would this be equivalent to modern IMR numbered powder? |
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I have several reloading manuals from a span of from 1950 to current issues. I like the older manuals with realistic loads that have not been lawyerfied on the altar of too much caution. Now I am not a hot-rodder but I like realistic data that allow me to get top performance from my not so common loads.
For example, I have a 7x57 load with 120 grains bullets that exceed 25-06 MAX LOADS by about 200 fps. It shoots like a lazer out to 500 yards. I ONLY SHOOT THIS LOAD in a modern 1985 vintage Winchester Model 70 Featherweight. This ammo is totally safe in the gun I use it in. It has been extensively chronographed. It will never be shot in any other rifle. PERIOD. I load it in Nickel plated cases so there will never be any confusion. This load/rifle combo has been used on 5 pronghorns from South Dakota and New Mexico, at ranges from 250 to a longest, best shot at just under 400 yards. In all cases, drt, one shot. I really think any serious reloader should have a few of the older manuals to use as one end of the loading spectrum and blend those loads with newer manuals. Responsible load development spans a spectrum from a variety of sources, and prudent ladder approaches across a range of known safe load levels. Always check and double check your data, and burn as much powder as you can. 
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Yes. DuPont = IMR data
https://en.wikipedia.org/wiki/IMR_Legendary_Powders |
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