The Firing Line Forums - View Single Post - Metering unique.... I didnt believe it.... now I do...

**Mike Irwin** · June 7, 2012, 10:50 AM

"If you want to discuss problem powders, let's talk IMR-4064!"

Not so much, and there in lies an ENORMOUS difference between IMR-type stick powders and just about any pistol powder.

IMR-stick type powders are probably the most forgiving powders there are. There can be significant variations in actual powder weight with virtually NO change in velocity, pressure, or accuracy. (See Hatcher's Notebook)

With most, if not all, IMR powders, loading density and powder position in the case seem to be FAR more important factors than absolute weight of the powder charge.

I use IMR 4064 because it gives outstanding accuracy in my rifles. In years past I obtained sub 1/2" groups using metered, but unweighed, charges of 4064 in my heavy-barrel .243.

With pistol powders, though, a comparable weight variation can spell serious trouble.

June 7, 2012, 10:50 AM	#89
Mike Irwin Staff Join Date: April 13, 2000 Location: Northern Virginia Posts: 41,388	"If you want to discuss problem powders, let's talk IMR-4064!" Not so much, and there in lies an ENORMOUS difference between IMR-type stick powders and just about any pistol powder. IMR-stick type powders are probably the most forgiving powders there are. There can be significant variations in actual powder weight with virtually NO change in velocity, pressure, or accuracy. (See Hatcher's Notebook) With most, if not all, IMR powders, loading density and powder position in the case seem to be FAR more important factors than absolute weight of the powder charge. I use IMR 4064 because it gives outstanding accuracy in my rifles. In years past I obtained sub 1/2" groups using metered, but unweighed, charges of 4064 in my heavy-barrel .243. With pistol powders, though, a comparable weight variation can spell serious trouble. __________________ "The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza Baby Jesus cries when the fat redneck doesn't have military-grade firepower. Last edited by Mike Irwin; June 7, 2012 at 11:03 AM.