Quote:
very long headspace slack
|
Put that in the Don'tFretAboutIt pile. As mentioned before, 10-thou tolerance is standard for all straight-wall gas guns (look up the 450 Bushmaster as well)
As to slamming the case back hard enough to cause brass extrusion, that would also be the case w/ over-sized (overly-shorten) high-pressure bottleneck cases like the 300WinMag/NormaMag which operate at 63,000. Doesn't happen.
Concentrate on timing.
postscript: You know the commercial stuff is loaded to the gills. Are you getting the same leakage/pressure/extrusion signs?