Thallub,
He's wanting to leave the expended primer in so water doesn't leak out when he fills them. You can, however, drip candle wax in to plug an empty primer pocket and knock it out with a decapping pin later. If it is too soft, pop it in the freezer. I've also pulled the anvils out of spent primers and flattened the bottoms of the cups with a large drift punch before.
Mgulino,
I've sure had to admit to numerous errors over time myself. There shouldn't be any ego interference with that. You only know what you know, and over time my memory isn't what it was, either. I heard recently that every time you remember the same thing, you are actually remembering your last time remembering it and not the original memory and you tend to modify the memory by iteration over time. The more often you remember it, the less accurate it becomes. Therefore, if you remember a fact often enough, eventually you should look it up again to be sure. The irony of the memory mechanism is that people with amnesia, therefore, have the least corrupted memories, if only they could gain access to them again.
What you are proposing will find the resized case capacity. The terms to watch are case water capacity and case water overflow capacity. The former is the amount of water space under a loaded bullet, while the latter is the weight of water level with the case mouth with no meniscus, so, despite its name, no actual overflowing is involved. But it's the one you want, cases sized and trimmed after sizing so they are all the same length from head to shoulder and from head to mouth.
Or...you could just use as-fired case water overflow capacity. When a gun fires, the case expands to seal the chamber, and high power rifle does it with enough pressure that the case fireforms to the chamber, the as-fired case water overflow capacity tells you what the case volume was when the pressure peaked and is the number that affects peak pressure. Indeed, you can think of your resizing die as a sort of tight chamber. Whether you compare resized or as-fired capacity, unless there are bent case mouths or other ejection dents, the difference in case water overflow capacity should match.
Water as a volume standard was originally used at very slightly less than 4°C (3.982078°C, or 39.169054°F), which is the temperature at which liquid water is most dense; as close to 1 gram/cc as it gets, to the best of our ability to measure. (The calculators say 1.000000000063067, or exactly that number of grams/cc, but I have trouble believing that level of precision). At room temperature of 72°F, its density drops to 0.99772 g/cc, but for any temperature, use
this calculator to find a precise number. Divide your water weight by that number (or the calculator's) to get a weight that can be converted directly to cubic centimeters by dividing by 15.432358 (aka, the conversion factor between grains and grams).
