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pathdoc, I'm a bit perplexed. In your original post you said, "The charge mostly stabilizes between 17.5gn and 18gn, which is good for almost all the load combinations I have in front of me (older IMR booklet), but there are intermittent and unpredictable excursions to 19gn, which constitutes an overcharge with the two types of primer I currently have."
In your last post, you said you have "never been that invested in accuracy and consistency."
Accuracy is more dependent on your personal skill with whatever weapon and load you have. Consistency relates to reloading skill, and relates to safety as well as quality.
If you want to prevent unpredictable excursions in powder charges, you must concentrate on the consistency of your techniques as described herein, and/or seek assistance from ancillary equipment that reduces those chances of overcharge. When I first started to reload shotgun back in 1969 or so, being a neophyte, I overcharged my 12-GA loads with Red Dot. It did not create any damage but the sound of the shot alerted those around me such that they brought it to my attention I must have done so.
Early on, in rifle reloading, I found H4895 was not quite suitable for my .270 after my load locked the bolt.
So I think it would be wise for you to look toward minimizing the inconsistencies by maximizing the available solutions.
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