Power pistol sure is heat sensitive.


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jr_roosa
September 20, 2012, 08:51 PM
Not really above published max but clearly hotter than it should be, so:CAUTION: The following post includes loading data beyond currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The High Road, nor the staff of THR assume any liability for any damage or injury resulting from use of this information.

I was chronying some loads today and though I'd run a mag of my carry ammo through, why not?

Win 45acp brass, colt rail gun, fed lp primers, 7.0 grains of power pistol, Hornady 230gr HP-XTPs. Usually goes about 850 fps.

I got 963. I had left my carry mags on the bench in the sun and they got warm.

Cooler rounds from the box in the shade ran a more tame 895. Still a little more juice than I like.

Note that the Hornady manual says that these should go around 840 or so.

Combine this with my previous data with the 7.6 max loads running near 1100fps and it makes me think about dialing back a little more.

FYI.

J.

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SlamFire1
September 20, 2012, 08:54 PM
Colorado?! Does it break 80 F there? How hot was it when you were shooting?

Regardless

All powder produces more pressure when hot.

All powder produce less pressure when cold.

I have blown primers on rifle ammunition developed and tested at 70 F, when I shot the stuff in 90 + F weather in matches.

Certaindeaf
September 20, 2012, 08:56 PM
Bring an ice chest next time and get/have them cold. That'd be interesting.

Reloadron
September 20, 2012, 09:02 PM
Bring an ice chest next time and get/have them cold. That'd be interesting.
Not unusual to see match shooters show up with their ammo in a small cooler. The idea being to maintain the ammunition at about a constant temperature regardless of what the outside air temperature is on any given day. Consistency is what it is all about.

Ron

jr_roosa
September 21, 2012, 12:19 AM
It was only 75 but the mag in the sun was hot to the touch.

We are much closer to the sun up here, you see... ;)

J.

Certaindeaf
September 21, 2012, 12:50 AM
Not unusual to see match shooters show up with their ammo in a small cooler. The idea being to maintain the ammunition at about a constant temperature regardless of what the outside air temperature is on any given day. Consistency is what it is all about.

Ron
I hear you and don't doubt you. I used to compete and win on the national level and never seen that though. I understand about consistency.

bluetopper
September 22, 2012, 12:11 PM
When Hornady or any manual lists velocities for a certain load/bullet combination that is not necessarily what "should" happen when you try it. I learned a while back that reloading manuals are merely a guide, not a Bible.

edfardos
September 22, 2012, 12:55 PM
40s&w with aa#5: 875fps cold, 950fps warm

I was surprised too, but then my chrony changes from day to day also (consistent but inaccurate)


edfardos

jjjitters
September 22, 2012, 01:13 PM
I've always devolped my rifle hunting loads by putting ten in the freezer,0F-5F and ten at normal temps for fall,around 50F. That way I could know how they shoot and group under "normal" hunting conditions uo here in the north. I general keep my pistol ammo out of the vehicle unless going to or from shooting, if I don't go into the backyard.

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