Re: 280 Ackley Improved Build
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: lhouston78</div><div class="ubbcode-body">i dont see why people think fire forming is a big deal just do the cream of wheat method. No bullets little powder and only takes a little bit of time. And the 280 AI is a great round, mine runs 168 and 162's at over 3000 fps and no pressure signs. </div></div>
Fireforming with the CoW is incredibly hard on barrels. I've done it and I've done pre/post inspections of throats.
You're basically aiming a sand-blaster down the throat.
It's very easy to fireform without CoW, the best way that I've seen in all the wildcat forming I've done is this:
Take the parent brass and get the case die-formed close enough you are ready to fireform.
Neck up 1 size over the final bore you want, then neck ~90% of the neck back down to the right size leaving a false shoulder in the neck.
Load some medium loads and go shoot freshly annealed, false shouldered brass.
Done.
You get trigger time, similar or less barrel wear than the CoW exhibits and perfectly formed brass.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: jarhead_h</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: .257</div><div class="ubbcode-body">Use Nosler Ackley brass only....
Why fireform, waste of time and money.....</div></div>
Only one reason, logistics. Have all your rifles set up with cartriges that use 30-06 as the parent case and then buying 30-06 brass in bulk and fireforming makes sense. I'm plannning a 30-06 AI, a 280AI and a 6.5-06 AI, all because 30-06 brass is cheapish and easy to get. Good for a switch-barrel. </div></div>
A word of caution: 280 uses 270 Win brass as a parent and the shoulder is 0.052" farther forward than the 270.
It doesn't use the same 30-06 but it's close. Trim length is about 0.040" different between 30-06 and 270/280.
280 has its own base-shoulder dimension, 30-06 and 270 share that dimension.
