temperature sensitivity

[XRe]

At this point I think I will e-mail VV and see what they say and that way we can get it "from the horses mouth" How does that sound

You're obviously welcome to do that Their response won't change what my chrono, and the match chronos that I shot over have said, though...

I'd be surprised if VV's response doesn't look something like the formula they publish on this subject in their hardcover loading manual (it's not in the supplemental small booklets). At some point, I think shred posted it somewhere on the forum... but my search mojo isn't so hot, today...

[cnote]

HP38 and tightgroup from hodgon email

???Are they Nitroglycerin based and thus standard ambient temperature sensitive or

Nitrocellulose based powders and reverse sensitive.

I would assume from shooting experimentation that they are glycerin??????

"Yes they are both nitroglycerin based."

Dave Campbell

Hodgdon Powder Company

Ballistician/Customer Service

913-362-9455 Ext.117

dcampbell@hodgdon.com

[3GunF1Guy]

From my testing of E3 is that it is total temp insensitive or neutral. I have done the ice test and sun test(actually I set the ammo on the radiator of my truck till it was almost too hot to touch.) on the same day within minutes of each other and had the ammo shoot the exact same velocity over the crono.

Scott

[cnote]

Guy Neill asked for help, so lets try to get a list of sensitive powders going

Inverse vs standard &/or neutral

Inverse list = N320, WST, Ramshot Silhouette, Solo 1000, IMR 7625 -

Standard list = 231/HP38, Tightgroup, Clays, WSF

Neutral list = 4756, N105, E3

I will add them to the original as you post them, please and thank you

Still have differing opinions on N320, may be a GREAT excuse to get some myself!!!!

[Skydiver]

Universal Clays is inversely temperature sensitive.

Before: 937.0

Warm: 911.6

Cold: 945.7

After: 936.4

What sucks is I go minor with the warm load. :-(

I guess I really have a reason to bump up my load to 172 PF.

Edited May 8, 2010 by Skydiver