Yep and that's why I stopped. I was expecting an increase of 100fps. 63grs of IMR 4198 netted me 1426fps this morning with a much cleaner burn. This is the first time I have used close cell foam backer rod in my loads. I thought maybe that had something to do with it but it didn't seem to make any difference with 4198. At any rate I am not going to push my luck. There are too many different powders out there.
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