fireforming cases

[manatee1947]

I have a supply of some 30-06 cases, and some 270 cases. I have neither gun, but I planned to use the cases for my 280 Remington. I have made many 35 whelan cases from 30-06 without problems, but have not had as much luck when necking down. If you have any experience with this, do you find going from 30 down to 284 easier or going up from 277? I previously used low pressure regular loads ( 35K +_) to fireform the new case. The 270 is shorter and I am thinking that the OAL plus the extractor would keep the case from going forward so the firing pin strike will be fire the cartridge.The 06 could just be set to neck size to the point that it would secure the case. Any info would be appreciated, it has been 35 years since the cream of wheat days, so this is new old territory.

[stimpylu32]

Either way will work , I've done both with good results , the trick is to anneal the necks first , I have found that necking down does make it much easier , as it lets you create a " False Shoulder " to help head space off of without having to up size the case first and then go back down , this also keep the amount of work hardening of the necks to a minimal .

stimpy

[manatee1947]

There is a link in the FAQs to fireforming, to Fred the reloader I think, Anyway, I followed the advice, got the closest shotgun/pistol powder to 700X that I had, old LR magnuim primers, which I have no use for anyway, measured the water weight of the case capacity, took 25% of that in grains (15 grains as it turns out for 270's) poured the case full of cream o'wheat, toppet it off with a dab of crisco shortening and lubed the case slightly. With some trepidation I went outside and pointed skyward. It went boom, well, more like a big balloon going pop, when the action was opened the ejector zapped the case across the room, no problem,and under a magnifying glass looks identical to my 280 cases....so far so goos, seems to work as well as I remember. 1970 all over again

[ironglow]

  Along that same line..
     Is fireforming .22 Hornet to .22 K-Hornet any problem if I decide to ream out my H&R ?

[Catfish]

While you can go up or down case neck dia. I never had any luck annelling the neck. I have used both the corn meal fire form to open case mouthes and also an expander die. The expander die works better, but it`s a cash out lay you can get by without. For necking down I like to use eather Mica or Graphite to lube the necks with. You might be able to take the 06 brass down without buying a form die set. Try sizeing it in the 06 sizeing die then run it through the seating die for the 284 then run it through the sizeing die of the for the 284. One thing to rember when you run necks down they get thicker and when you neck up they get thinner. I would risk a case or 2 of the 06 brass and try necking it down. I don`t try to ram it through when going that far, but bump it in litely.