Fireforming brass: max or min powder load

[40 Creedmoor fan]

I have a brand new bag of 6.5CM brass and would like to fireform it to my rifle. This is the first time I've bought brass. Previously, I would buy a few boxes of factory ammo and reuse the brass. Factory brass is typically loaded to the max but I usually load a little lower(use the trick where I increase until I see signs of pressure then back off by 0.1gr until groups stop shrinking in size)

My question is: is there a general consensus as to how much powder to use for fireforming? Min? Max? Same as the load I plan to use?

 

[greencobra]

when i fireform my 30 herretts from 30-30 brass, i use the starting load recommended in my old lyman manual. i'm not going for accuracy obviously, just want to form the brass. of course i also have to reform the brass before i fireform.

 

[jpm]

I would not use max charge to fire form, just use the same load you plan to use anyway.

 

[TrashcanDan]

Did you buy new brass or once fired stuff off a website?

 

[40 Creedmoor fan]

Did you buy new brass or once fired stuff off a website?

Brand new Hornady brass. Picked it up at Cabela's

 

[TrashcanDan]

Load it like you would normally. You're going to resize it anyways when you go to reload it.
Same load as you plan to use like you asked in the original question.

 

[Uzi2]

12gr of Unique, fill the rest of the case with Cream of Wheat and plug with toilet paper or white bread.
Not kidding, look it up.

Personally, I wouldn't waste my time, my powder or my primers doing it.

 

[sieveboy]

I would not waste time and materials fireforming factory brass already in the desired chambering.

 

[Mudflap621]

I would not waste time and materials fireforming factory brass already in the desired chambering.

This.

 

[mac1911]

Why are you fireforming? Your not going to neck size only are you

 

[40 Creedmoor fan]

Why are you fireforming? Your not going to neck size only are you

The idea is to get the brass shoulder matched to the firing chamber and then full-size it with a 0.002 shoulder bump.
This is what I'm looking for(this example is over-exaggerated but it makes the point)

 

[Noreaster]

12gr of Unique, fill the rest of the case with Cream of Wheat and plug with toilet paper or white bread.
Not kidding, look it up.

Personally, I wouldn't waste my time, my powder or my primers doing it.

Holy F, your serious. Thats amazing! Have you done it? I need to check you tube for this.

 

[Mudflap621]

The idea is to get the brass shoulder matched to the firing chamber and then full-size it with a 0.002 shoulder bump.
This is what I'm looking for(this example is over-exaggerated but it makes the point)

One or two firings and they’ll be there anyways. I could see fireforming if going to an improved chamber or something like that.

 

[Tackdriver VillenTactical]

I made 6PPC brass fire formed from 220 Russian with less than the recommended 6PPC minimum without issue.

Dave

 

[mac1911]

The idea is to get the brass shoulder matched to the firing chamber and then full-size it with a 0.002 shoulder bump.
This is what I'm looking for(this example is over-exaggerated but it makes the point)

Heres some orher ways to fireform

Reloading 101: Fireforming Cases

Written by Sierra Bullets Ballistic Technician Duane Siercks What is fireforming? Fireforming is the process of creating custom fitting cartridge cases for your specific firearm. Having the “…

sierrabullets.wordpress.com

 

[xtry51]

I would use a min load if I was firing forming. I've done some .270 Ack before.