A late Christmas present for my ffl buddy.....

[Gordon]

The 75 Grain Amax is a devastating round in my .22-250AI 1-8 " barrelled Weatherby . ! It was to be my antelope rifle replacing a Win 70 Westerner .264 but ended up being THE truck rifle as it will take anything below elk as far as I want to shoot, with dramatic results ! Makes Coyotes "pink mist" like a ground squirrel at a quarter mile ! I had to move up the optic to 6-24 power to keep up !

 

[LoonWulf]

Minor update.

The rifle has been headspaced and bore sighter.
Ive made one dummy round and so far everything looks good.

Coal will be about 2.650 with 75 Amaxs, gonna fire form with 4895 i think, then move on to slower options.

 

[troy fairweather]

Could use cream of wheat to fire form, saves on bullets and most of all barrel life. Use a fast burning pistol powder or some shotgun powders. Powder, case full of cow and one square of toilet paper in the case mouth. Some charges I've remember seeing are. 15gr clays, 15gr unique, 15 gr bullseye. You can start lower and stop when the shoulder fully forms.

Bullet fireforming a case with so much taper some like to have the bullet jamed some, even though there should be about .004 crush some think the case length shrinks enough and can cause case head Separation. So maybe try 1.5 grains off max 22-250 load with .020 jam.

 

[LoonWulf]

I used to cream of wheat form my .250AIs, actually made a pvc forming chamber thingy so i could do it in the garage. I don't have that anymore, tho I could make another.
I think for the 250 i was using 10-15gr of 231.
Be nice to make cases at home......

 

[doubleh]

on the project.

 

[LoonWulf]

Got out for a while yesterday and fireformed/function tested the rifle.

I shot 19 rnds of my fireforming load (one old primer didnt go after multiple smacks) tho most of that was just blasting berm trash. The one group I did shoot shows promise for the rifle tho.

I processed the 19 Cases that were formed (all of which formed really nicely) and lost 2 with split necks. These are old, fired brass, and if id been thinking before I started on them Id have annealed them.
Still when dell went to the range today, he went with 16 (used one of the good ones for a water capacity...came out at 49.6gr) ladder loaded with a top charge of 44gr of IMR-7828. It sound like he mostly shot berm trash too, and only ran the last charge over the chrono, but shes moving those 75gr Amax out at about 3440.
Im gonna make a new forming chamber and see if I can COW form the rest of the old shells I've got, then we can do a bit more testing for consistency.

 

[Legionnaire]

@LoonWulf, lookin' good!

 

[LoonWulf]

@LoonWulf, lookin' good!

Thanks!
Were pretty stoked on it.

 

[troy fairweather]

Forget if you have a muzzle device on the gun but if so remove it when forming with cow, cow have been known to blow the break/ flashhiders apart.

 

[horsemen61]

Thanks!
Were pretty stoked on it.

As you should be!

 

[LoonWulf]

Forget if you have a muzzle device on the gun but if so remove it when forming with cow, cow have been known to blow the break/ flashhiders apart.

Nope, Dells muh buddy, but not buddy enough for me to pay for a threaded barrel LOL. Thats a good warning for the future tho, I wasnt into muzzle brakes when I was COW forming (the .250 didn have a threaded muzzle either).

 

[troy fairweather]

Nope, Dells muh buddy, but not buddy enough for me to pay for a threaded barrel LOL. Thats a good warning for the future tho, I wasnt into muzzle brakes when I was COW forming (the .250 didn have a threaded muzzle either).

I'm not much either I do want to try one of those barrel tuners, they seem to have a break built in to. Maybe when I get a 6 arc together or something where using factory ammo makes more sense these days.