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Been reading and thinking I know, bad. Larry, you GCs come off due to the alloy you use and the shock wave that hits the base. It dissipates quickly in the GC/bas – basically it and high pressure turn the base to mud for a few pico seconds. GC gets work hardened but base remains softer than the body, grain regrowth takes about an hour and is always large grain. All the SB/Sn alloys plastisize at lower pressure than Cu alloys, not much diference in the curves for different ratios of sn/sb. Powder burn rate does affect the shockwave velocity but they are fast enough to cause ‘disassociation’ of all crystal structure. I’ll try re-writing this to make more sense later..

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