Cream of Wheat forming question

[Mooster1223]

I would like to fire form my 375 CT and 416 Barrett cases to my chamber using Unique powder. Is there some sort of formula for a quantity of powder to use based on case volume? I've done it on a much smaller scale but never with cases this size.

Thanks

 

[Dusty Stevens]

Dont use it. Use a paper towel plug. No good and tons of bad can come out of using filler

 

[gunsandgunsmithing]

Dont use it. Use a paper towel plug. No good and tons of bad can come out of using filler

I agree. Maybe not so much from a smaller case but that's a lot of Unique! I don't see a downside to tissue or a cotton ball over COW, anyway. If you do it, as with any cartridge, work your way up to a full or very near, form. I have no real idea where to tell you to start with a case of that size..sorry.

 

[INTJ]

Here is my experience:

http://forum.accurateshooter.com/threads/fire-forming-improved-rifle-cases-without-a-bullet.4002402/

 

[Dusty Stevens]

I would ss pin clean any brass thats been fired like that. One clump in the shoulder and you got a bomb

 

[JFrank]

Why can’t ya just hit um’ with the recipe and be there ?

 

[JSH]

If it has a brake,take it off.

 

[Kurz]

Using fillers when fireforming comes with its own set of cautions. Most of the grain fillers contain an oil which exudes with the heat of the load. This can cause 'clumping' and fouling between shots so examine your chamber and bore before firing the next load.

This from another website citing some suggestions and experience:

https://www.longrangehunting.com/threads/375-cheytac-fire-forming.184100/

Read all the text.

From Peterson Cartridge Company:

Product Information
All Peterson Cartridge casings come in one of their plastic ammo boxes.

Made in the U.S.A.

The 9.5x77 (.375) cases for CheyTac® chambered guns is manufactured on Peterson Cartridge’s new, state-of-the-art case line which uses cutting-edge technology to produce some of the most precise and consistent casings on the market. Peterson Cartridge Co is committed to producing Match-Grade Brass that enables our customers to get more reloads per casing than industry average.

Warning: Only use Peterson Cartridge Co. casings in firearms in good condition, designed, marked, and chambered for this cartridge. Do not use Peterson Cartridge Co casings for “fire forming” or any other purpose other than what they were designed and tested for. Peterson retains no responsibility for the enclosed casings if they are used outside of the manufacturer’s recommendations.

This is not loaded ammunition.

We've all read these disclaimers before but I thought it should go with the above thread just in case.

CYA!

 

[Joe Salt]

I have always used a bullet either in the fire form gun or any rifle. I tried it without but the barrels always got to hot for my liking.

Joe Salt

 

[Kurz]

I have always used a bullet either in the fire form gun or any rifle. I tried it without but the barrels always got to hot for my liking.

Joe Salt

I agree with using bullets when I can. But I sometimes have to fall back on COW (generic) due to the number of cases I have to create. If it's just a few for testing, bullets win. If I have to make more than a few, it's COW.

 

[SBOOMER]

Unique, no filler and a wax or soap wad in the case neck. Load, POINT MUZZLE UP and fire. In most cases with annealed brass you will get a 95% fireform. Next load should be with a bullet and false neck created by upsizing one caliber prior to neck sizing. I used 20gr of Unique when FF 6mmAI cases.

 

[Mooster1223]

Why can’t ya just hit um’ with the recipe and be there ?

The component cost is quite high. It's a bunch of powder (that's currently hard to come by) and lathe turned projectiles.

 

[Mooster1223]

Thanks for the links and the info. I'll try 25 gr of Unique and a paper towel or tp. I've used crushed up corn flakes as a filler in the past with a patch shoved in the end.

 

[dthomas]

Thanks for the links and the info. I'll try 25 gr of Unique and a paper towel or tp. I've used crushed up corn flakes as a filler in the past with a patch shoved in the end.

Paper towels or toilet paper may be worth more than the lathe turned bullets nowadays.

 

[INTJ]

I have always used a bullet either in the fire form gun or any rifle. I tried it without but the barrels always got to hot for my liking.

Joe Salt

For me it's not a matter of shooting up bullets. It's using up 200 rounds of barrel life and getting no useful info in return when it comes to forming for an AI competition rifle.

Like I posted in my report, I used wet washcloths to keep the barrel temp in check because I didn't want to take all day. When all this was done I scoped the bore with a Hawkeye and found just a little carbon fouling. No fire cracking or erosion. After I cleaned the bore it looked like it did before I started.

I don't know why this approach wouldn't work with a much larger case, though 55-60+ grains of Bullseye seems like a lot and would shoot a lot of flame out the muzzle.

 

[Dusty Stevens]

For me it's not a matter of shooting up bullets. It's using up 200 rounds of barrel life and getting no useful info in return when it comes to forming for an AI competition rifle.

Like I posted in my report, I used wet washcloths to keep the barrel temp in check because I didn't want to take all day. When all this was done I scoped the bore with a Hawkeye and found just a little carbon fouling. No fire cracking or erosion. After I cleaned the bore it looked like it did before I started.

I don't know why this approach wouldn't work with a much larger case, though 55-60+ grains of Bullseye seems like a lot and would shoot a lot of flame out the muzzle.

Way different wear shooting a bullet and fire or just fire not under pressure

 

[Steve Ladino]

For me it's not a matter of shooting up bullets. It's using up 200 rounds of barrel life and getting no useful info in return when it comes to forming for an AI competition rifle.

Like I posted in my report, I used wet washcloths to keep the barrel temp in check because I didn't want to take all day. When all this was done I scoped the bore with a Hawkeye and found just a little carbon fouling. No fire cracking or erosion. After I cleaned the bore it looked like it did before I started.

I don't know why this approach wouldn't work with a much larger case, though 55-60+ grains of Bullseye seems like a lot and would shoot a lot of flame out the muzzle.

I used 15 grains of Newer Bullseye under tissue to FF 22-250 to AI. That seemed like a lot, loud, with recoil and muzzle flash. I would approach 60 grains of B E in anything with extreme caution.

 

[GNERGY]

I just did 250 22/6mmAI using 16grs HP38 with a half a piece of toilet paper tamped down in the case. Drilled a hole in my garbage can to fit the end of the barrel and did it in the garage, still had to put muffs on. After about 20 rds it started shooting the toilet paper thru the other side of the can, put one of my steel targets in there. Got finished and put the can on the side of the house and the cops drove down the street real slow with his windows down and parked in front of my neighbors house for about 10 minutes and then finally left. Close call.
Tarey

 

[Bob L.]

In my 6BRX, I have used 9 gr of Unique with COW and a 22 cal cleaning patch. I useD a dedicated fire forming barrel. I did my last batch shooting into a plastic shipping barrel filled with rubber garden mulch. It helped, but I still needed muffs. I shot 200 rounds inside my workshop with the overhead door closed and in the middle of a weekday. No cops were seen.

I’ve tried all the conventional methods and will probably go back to a false shoulder, shooting 108 gr bullets with a normal 6BR charge of Varget in my target barrel and compete at 600 yds. It shoots with excellent accuracy and I don’t really give up much barrel life.

 

[Brians356]

Thanks for the links and the info. I'll try 25 gr of Unique and a paper towel or tp. I've used crushed up corn flakes as a filler in the past with a patch shoved in the end.

I use about 15% of case volume Bullseye (no filler, no wad, no plug - just shoot straight up!) fireforming 22-250 into 250 Ackley 40-deg. I found wetting the case body slightly with Kroil or Rem Oil works best. Also, use a pistol primer.

PS find which Lee dipper holds the proper charge, and you can load each case in the field with no weighing. No need to transport charged cases.
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