Comments on: Can Carbon Build-Up Inside Cases Alter Pressure?

By: Fred Bohl

Fred Bohl — Fri, 22 May 2015 17:45:51 +0000

When we did the test we determined the change of volumetric capacity of the cases and reported that volumetric loss as the equivalent to the grains of the RL17 powder density. So more simply we did not measure the case weights.

However, the residue left in the not cleaned case interiors is mostly carbon and about 2 to 3 times the density of the powder. Therefore I would estimate the case weights would increase by 2 to 3 times the reported loss of capacity in grains.

By: Mike

Mike — Fri, 22 May 2015 17:43:03 +0000

The term ‘capacity’ here was never defined. So “0.3 to 0.4 gr. loss of capacity” means what? H20 capacity?
Your capacity measure with heavily fired & sized cases was really so consistent and accurate that you could define it like this? And yet, not define it at all in reporting of results..

Seems Hokey. Like a stretch to find value in all the over cleaning, but while having to re-foul necks to get best seating -which we already have with naturally fouled cases..

By: Davidjoe

Davidjoe — Fri, 22 May 2015 14:11:41 +0000

I’d be curious whether say 25 firings or so through a new case without cleaning the inside adds any measurable weight to it.