Hello, is there a powder on the market that'll equal the IMR-800X loads? 135s clock an actual 1825fps from a 5in Nowlin barreled Para conversion but as you might well know 800X doesn't meter well in the progressives!
I gave up on 800X and a shelve full of other powders a couple months ago after testing Longshot.
The powder is weird in that after a certain level is reached adding more powder to the load actually reduces velocities much like I've seen with Lil Gun in the Casull and Linebaughs.
Last clocking resulted in 1890fps with the Nosler 135gn from two different 5in barreled 1911s (Nowlin/Kimber) at 0 degrees.
That's a dangerous place to be. When velocity stops increasing in proportion to charge weight increases it doesn't mean that the pressure doesn't continue to rise. What you see is a very small or neglible in crease in velocity for more powder and then the time/pressure curve goes straight up and stuff goes everywhere.
I've read the same discription before tho for the life of me I can't reason it out. More pressure equals less velocity measured, since you wrote it I'll believe it!
When we did the .475 Linebaugh work ups with Lil Gun (both in FA sixguns) I wasn't real concerned with over pressure tho tseems I shuld have thinking back. In the good/bad ole days we used triplex loads in the 454 Casull that nowdays I wouldn't think about using.
Anyone have suggestions on which portable unit is best for testing pressures?
Ohler makes a model that works with a strain gage you epoxy to the area surrounding the chamber. Works great with rifles but have no idea if it works with pistols and even less sure on revolvers. Shooting Times handloading editor, Rick Jamison, used one and really like the data it provided like pressure, peak to peak, etc. Too expensive for my pocketbook though.
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Russian Ammunition imports are mentioned.
This will not help the supply situation.
http://www.dia.mil/publicaffairs/Foia/smcal_vol1.pdf (10mb download. HT to delloro for updated link.)
http://www.bordingl.com/zfondelli.htm (Non English)