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Fireforming Pressures

 
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  #1  
Old 07-01-2008, 10:51 PM
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Fireforming Pressures

This may be a stupid question, but does anyone know how much pressure it would take to fireform a 300rum case to an improved version. I have a chart from quickload showing pressures at given charge weights. I was hoping to save myself a little time by not having to go through a load developement process just to find an adecuate forming load. Thanks!!!
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Old 07-02-2008, 12:12 AM
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Location: Blackfoot, Idaho
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In accordance with instruction from the maker of my 270 Allen Mag which based on the 300 RUM case and improved w/a steeper shoulder I do the following.

Resize leaving a 0.1" or so shoulder so the case doesn''t jump away from the bolt face.

A non magnum primer

20 grains of Unique

Fill with corn meal. Shake down and refill.

Top off with one square of TP to seal 'er up.

Fire away.

Don't go too fast as the barrel heats rapidly.


Saves wear and tear on the barrel but kind of warrants a trip to IHOP aftwards.;)

However, there has been some difference in performance in some precision rifles between the first full power shot and subsequent shots with the brass. This is a very slight but noticeable different and only in some rifles and most noticeable at far distances.

I'm about to do a hundred 7mm RUM cases with this method as soon as those suckers get here.
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Old 01-18-2013, 06:10 AM
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Location: wrexham north wales UK
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Re: Fireforming Pressures

When fireforming my 17A/H from 22Hornet brass i use the identical load as my hunting ammo but i am not loading up to max i load for accuracy and my fireform loads shoot to same P O I as my hunting ammo.
I tried a lower charge but the shoulders did not seem as sharp as needed.
Wally
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Old 01-18-2013, 06:13 AM
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Location: wrexham north wales UK
Posts: 18
Re: Fireforming Pressures

When fireforming my 17A/H from 22Hornet brass i use the identical load as my hunting ammo but i am not loading up to max i load for accuracy and my fireform loads shoot to same P O I as my hunting ammo.
I tried a lower charge but the shoulders did not seem as sharp as needed.
Wally
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  #5  
Old 01-18-2013, 10:36 AM
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Join Date: Feb 2011
Location: Cincinnati, Ohio
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Re: Fireforming Pressures

Quote:
Originally Posted by J300UM View Post
This may be a stupid question, but does anyone know how much pressure it would take to fireform a 300rum case to an improved version. I have a chart from quickload showing pressures at given charge weights. I was hoping to save myself a little time by not having to go through a load developement process just to find an adecuate forming load. Thanks!!!
Just chose a midrange load or a load slightly above midrange. You need enough pressure to blow the casing out to fill every nook and crannie and no more. More wont hurt anything...but just isnt needed.

Some guys just load up a minimum hunting load and take it from there
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  #6  
Old 01-18-2013, 11:25 AM
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Location: Gillette, WY
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Re: Fireforming Pressures

My first Ackley improved cartridge was the.243AI, Sierra's tech line advised that I utilize a cheap bullet loaded long enough to jam into the lands when the bolt is closed (same function as Roy's ghost shoulder) with a load toward the max end of the spectrum for that bullet.

that particular method had formed hundreds of .243AI & 6mmAI rounds for me to great effect.

In a particluar 6.5-06AI that I load for, we use the cornmeal method described above (with a little less powder). The shoulders aren't perfect but close, the next firing established sharpness of the shoulders.


t
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  #7  
Old 01-18-2013, 04:42 PM
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Location: Central AZ
Posts: 883
Re: Fireforming Pressures

Just a word of caution when using the cornmeal method: if your barrel has a brake on it, be sure to remove it before fireforming your rounds. The fiber in TP or cotton, when used as a plug in the end of the brass to hold ther meal and gunpowder in, can get caught in the baffles or gills of the brake. It has enough force to crack or break the metal baffles. (Please don't ask how I came about this little gem of truth).
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