On Thu, 03 Jan 2013 17:18:03 -0600, Ignoramus9117
wrote:

On 2013-01-03, Joe AutoDrill wrote:
Guns and their projectiles are closely matched items.

What if the bullet is in the pocket of the shooter and is thus warm and
the gun is outside and at a fairly cold temperature of zero Fahrenheit.

...Do the tolerances get too close and the potential for a jammed
projectile increase significantly?

Where do the temperature differences start to matter presuming a slug or
solid projectile is used?


Sounds like a great time for an experiment, let us know.

My own answer is that the differences are minute and will not matter.

i


Oh they do indeed matter..and the closer to a Hot load on a cool day
you get..the closer you get to popped primers on a Hot day.

Some cartridges will exhibit this phenomina radicly with some
powders/bullet/primer configurations.

I once loaded a warmish load during mid winter that shot very well out
of a heavy barreled 22-250. Sub fractional inch groups.

Forward to July. Got set up on a nice ridge over a ground squirrel
colony and fired off my first shot. Pulled the case..and the primer
fell out. Fired the second shot...pulled the case..primer fell out.

Put the cases back in the box and took the rounds home, pulled the
bullets, dumped the powder back into the can and reloaded them with a
different well proven load. The summer heat caused that load
combination to reach at least 70,000 psi..not a good thing at all.

Gunner

The methodology of the left has always been:

1. Lie
2. Repeat the lie as many times as possible
3. Have as many people repeat the lie as often as possible
4. Eventually, the uninformed believe the lie
5. The lie will then be made into some form oflaw
6. Then everyone must conform to the lie