Camber pressure

[shenck]

Chamber pressure

Does quickload or some other software calculate chamber pressure? I am working up a load, and I am 2.5 grains over max. So far I have not had any signs of excess pressure. If someone has a program and would run the numbers for me it would be greatly appreciated. Just let me know what info you need.


Misspelled Chamber in the subject line. Just one of those days.

 

[Sententia]

QuickLoad does estimate chamber pressure. I'd be happy to run the numbers for you.
The more details you can provide, the better:
* Powder type and grains
* Cartridge type
* Bullet type, length, weight
* Seating depth of bullet or OAL of cartridge
* Case capacity (in grains of water)
* Barrel length

 

[Seedtick]

Hey shenck, I don't think I would want to shoot anything that was 2 1/2 grains over the max.

If you want to edit the title - after you click edit look down at the bottom right of the message box and click on Go Advanced (by the save button) and it will let you edit the title. HTH

ST

 

[rcmodel]

Quick-Load, as far as I know, has no provision to allow for a loose or tight chamber, throat erosion, a loose bore, or a very slick bore.

Or a custom bolt-action with trued & lapped lugs, and everything else polished. That can mask a lot of case expansion that would cause hard bolt lift on a lesser rifle.

Any of those things could allow your specific rifle to be able to shoot 2.5 grains more powder without pressure signs then my or anyone else's rifle.

The only sure way to tell what is maximum in your rifle is by looking for diminishing returns with a chronograph as you add more powder.

It also depends greatly on what caliber and what rifle you are asking about.

You could be well over a published max in a 30-30 Winchester lever-action
and you will not get any pressure signs until the barrel blows off the receiver.

rc

 

[Ol` Joe]

2.5 gr over max is alot different in say a 375 Mag then in a 22 Hornet. You might be well within your firearms limits but with out a lab you`ll never know for sure. RC mentioned just a few of the variables that can cause pressures to vary.
Anytime you load hot it is prudent to keep a very close eye on your brass and velocities. If something doesn`t quite click, stop and verify the cause. Summer temps, worn throats, etc, can pop up unexpectedly on occasion.

 

[ants]

I'm sure there are reasons why he's 2.5g over max. Some are good, some are bad.
We all try to make good choices.

Schenk, be careful. All those computer programs like Quickload theoretically calculate pressure. Sometimes they're surprisingly close, but sometimes not. They can never tell you actual pressure. Especially with a small caliber, be careful, friend.

 

[shenck]

thanks for the advice

I have an answer, and it looks like I will be reducing the load. I didn't want to post any specific info on the load for all to see, you never know if some will say if he is shooting that load with no signs of pressure I can try it. As always I appreciate the feed back I get on this forum.