Laser heat reading gun

R

RandallHuckelby

Guest
I've got a heavy barrel 6.5 284 that I don't shoot in warm weather because I think it gets too hot when the barrel gets warm to the touch I stop shooting

I don't know what the parameters are if taking readings with a laser
 
I personally try to back down before outside of barrel reaches 200F.

I use a barrel cooler, have used it in competition, or will set a gun/barrel aside. I've run room temp water through barrels in competition and promptly won wood. Others thought I was crazy, asking for gatoring....I dunno, I just didn't want my glue-in to let go!

I don't know of any established parameters..... I've heard things from "Duhhh! The melting point of steel is 2500 degrees, y'er not that hot!!!" To "when spit sizzles, stop" to "The barrel doesn't shoot until it's heated up" to the old standby "If you can't hold your hand on it it's too hot."

I personally stop at around 200F


My barrels do last a long time.


Hopefully someone who knows more will chime in

al
 
Rule of thumb (forget where I read it): If the outside of the barrel is too hot to hold (about 160 *F), the inside is well over 400 *F. Internal temperatures this high result in ammunition "cooking off" if exposed for a sufficient length of time. How soon that temperature is reached depends on how much you're shooting in a given amount of time.

Harbor Freight sells an IR thermometer which uses a laser spot to show where the reading is being made. Link to it is http://www.harborfreight.com/non-contact-infrared-thermometer-with-laser-targeting-60725.html . Check for coupons before buying, as you can save $10 using one.

POP QUIZ! Where in the barrel are the highest temperature readings found?
 
Last edited:
Yeah 150 to 200s about what I figured

I looked to stick on thermometers but I can use the harbor freight laser for other things

Pop quiz I would think right in front of the chamber but I don't know
 
I would guess

About 3-6 inches in front of the chamber where the gas plasma is probably hottest after that the increasing bore area probably soaks up the heat as the projectile travels down the barrel and the gas volume spreads out over this increasing volume? Greg
 
glp,

You are correct. 3-6" is about where most of the powder burns - after that, it is expanding. Temperature is why barrels usually wear out at the throat, rather than the muzzle. Chemical attack at high temperatures and pressures is the primary killer of barrels, not mechanical wear.

Remember the following:

  • Gas cools as it expands;
  • Pressure decreases with a volume expansion;
  • Powder "gas" is full of carbon and nitrogen and associated compounds. None of which are kind to barrel steels;
  • Flame temperature of powder burning is estimated to be over 3000* F.

Now you know more about why the working life of a barrel is between 1 to 2 seconds.

For a nice, short article (or series of articles) on internal ballistics, see http://www.frfrogspad.com/intballi.htm .
 
Thanks guys I know where to point a laser now



Huck
 
You must log in or register to reply here.
Back
Top