Fireforming AI Accuracy

[CharlieNC]

I have read when fireforming a standard brass into AI that the accuracy is still very good. That makes me wonder what is going on with the headspace; I'm thinking there will be a "lot" of headspace? Also what does this say about the effect of headspace on accuracy? In other words does this mean headspace is primarily important for safety and extraction, but not as important as other factors when it comes to accuracy?

[keeki]

An Ackley headspace is actually shorter than a standard round by .004-.006" so a factory round should be snug chambering it

[yobuck]

An Ackley headspace is actually shorter than a standard round by .004-.006" so a factory round should be snug chambering it

if the shoulder stays the same, wheres the extra powder go?

[keeki]

The shoulder doesn't stay the same, shoulder gets blown out. The factory round will headspace at the neck-shoulder junction

[goinssr]

Ackley rounds not only have the shoulder formed at approx. 40 degrees but the also blow the taper out of the parent case so that the case walls are more parallel thus increasing volume.