Home Forums Hunting & Shooting Ask The Gunwriters JB, have you tested IMR 4350 temp sensitivity?

I shoot a lot of both IMR4064 and IMR4350, in the .223, .243, .260, 7/08, etc..... Once it gets below about 10 degrees, I’ve found shooter temp sensitivity to play a much larger roll in accuracy/POI shifts.... than powder temp sensitivity.

MontanaMan,

Haven't done any formal testing of either, but both have been consistent.

One thing mentioned in the article is that so far I've never cold-tested a powder claimed to be temperature-resistant that didn't work well at zero.

Dogshooter,

That can be a factor!

However, when I do my zero-degree testing I pick days that are calm, and usually sunny, because quite often high pressure results in those conditions during Montana winters. It's actually usually pretty pleasant, at least for a native Montanan of Norwegian ancestry. I shoot the rifles over a benchrest, with a warmed-up pickup nearby in case I need to reheat either the shooter or the chronograph.

I described all my methodology (including this) in the article, but have discovered over the 15+ years I've been a Campfire member that most people don't want to read 2000+ word articles. Instead they want the 3-sentence Internet version of knowledge.

Yep, give it to me now, now, now!

Yes, I've noticed chattering teeth for some strange reason makes it more difficult to achieve small groups too!

John, I enjoy your 2000+ word articles because everything you write is knowledge to me. After reading your articles and books for many years I can't say I've disagreed with anything you wrote. I've been reloading and making bullets for 58 years and I'm still learning.

Mike

Oh Please ! Don't do that. His wife has hard enuff time dealing w/him as it is.



Jerry

In a few observations with 8208 I’ve found it to be as good as it gets. Basically no difference from 70 to 10-20 deg

Joe,

OK, here they are three sentences, this being the first one:

1) If you hunt in widely different temperatures, use a temperature-resistant powder.

2) If for some reason you can't, then you should actually shoot YOUR ammo in YOUR rifle before going hunting, to find out what happens.

John,

Jeez, there you go with a concise and logical reply again. On the internet no less

I didn't know gack came in that form.

Geno

PS, test firing my rifle and ammo BEFORE hunting? How many years have I been hearing that?

PPS, I'll have to look for that article in the issues I just received. After retiring and relocating to our place in CA some issues of Rifle and Handloader didn't follow me. I called the subscription dept and could not be happier with the service. 3-4 days and they were in my PO box.

Thank You.

MM

John, I was just yanking your chain, I read your article. And remember, a huge number don't comprehend what they read so they need it to be short. (That's not what she said)

Joe,

Yeah, I knew that!

I was just yanking the chain of the people who want it all in three sentences....

HEY ! Wait a minute ! !
lol


Jerry

More gack?
can't wait