Every time I buy a new lot of powder, test a replacement bullet or get new cases I begin the load development process. Granted I don't have to do that often, 8 pound kegs of powder go a long way and I haven't had to buy new cases since I got my 358 Win. a few years back. I am going to have to buy a new keg of H-110 and so I will have to check my loads for pressure and accuracy when I do that but only for two of the calibers that I load. Loads change over time for me by small amounts because of differences in lot to lot changes. I standardized all my loads with Hodgdon powders a few years back because Winchester kept dropping and adding new powders. I use Sierra and Speer bullets because they never seem to change and are available in my area. I only use CCI and Winchester primers and loads are worked up with the components that provide the best accuracy over a wide range of environmental conditions over prolonged test periods. I probably am a bit @n@l-retentive about keeping records - even the failures - and have records that date back to the early '70s when I started reloading.
Load development never ends until you stop pulling on the handle of your press - ain't life great?
PaulS
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Teen **** tube