So tried this fire forming without a bullet. Results and process below.
Trying to form case with less steps and removing the .270 or 7mm step.
I annealed the neck, size to .223, trim the case so the neck just touches the start of the rifling when closing the bolt, worked up a load of 7625 (all I could get for free), this then had a small cleaning patch to hold the powder in. Not really sure where to start, I fulled a case, weighted it, and start at 10% of that(this turned out to be too low when just using a small 10mm patch, this didn't give enough resistance). After 20 odd case later, 18-19gr does the job.
Adding some Cream of Wheat of something similar might be better for driving the pressure up and being able to the powder load.
Also, from about 16gr, there was a flame out the end of the barrel. At 19gr, the flame was about a foot long.
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