best way to fire form Ackley Improved

[coyoteklr]

i have used the filler method and definately don't care for that.... it doesn't seem to make a nice crisp shoulder.... i usually use the bullet weight i'm going to shoot except for the 22-250 i use a 55 grn. instead of the 50 grn....
i put a max load of powder (usually right up to the neck) but measured at max load for that powder.... seat the bullet.... load and fire.... brass prep before fire form...
i don't fl size.... turn the die out half a turn on new or once fired brass and not bump the shoulder.....
how do you fire form yours????????????????????????????

 

[40X Guy]

I will fireform using bullets that I have culled or won't use in LR shooting. I usually use Varget powder as it is fairly clean burning, and I jam bullets about .005 so case is square against bolt face. I never used the Cream of Wheat method, as I feel I need all the trigger time I can get. You are on the right track.

Frank

 

[CJ6]

Neck up to 25 cal (or enough to create a false shoulder)in your instance,then partially neck back to 243 ,just enough to get a "slight crush fit" on an empty case, load and shoot. A tapered mandrel works great for expanding .

 

[Rock Knocker]

Well im about to be doing the same thing for my 260AI. I just picked up 100 pieces of winchester 7mm-08. I was going to FL size them with a cheap Lee die to standard 260 then load them on the higher side with 140gr noslers and fire form. then use a lee collet die for the necks and get a FL Redding 40 degree to do the occasianal resizing.

This false shoulder has me interested and i havent done any research on it. But instead of using a 260 FL die if i used the collet die i was planning on getting to make a false shoulder from the original 7mm neck.

How does this sound because it will be all new to me, both fireforming brass and necking the brass down.

 

[alf]

Take the firing pin assembly outta the bolt, and neck your 7-08 down till you get a good snug fit on the brass. If the gunsmith chambered it properly, it should be a snug fit on 260 or 7-08 brass without a false shoulder. Regardless, now you've got a belt and suspenders approach.

Here's an example of making a false shoulder to fireform a 22 Dasher.

Same principal regardless of case used, but more dramatic in this instance.