Thanks again for all the info. It appears from what you guys say is that the load is safe but not recommended for the 66. That makes perfect sense to me. I'll shoot them in my 686. Should be a good hog round maybe.

Like I said, I worked up the load back in June and didn't notice anything out of the ordinary enough to note it in my book. I just checked out my Sierra manual, which is what I had back then along with the Lyman. Their max for a 140gr JHP with 2400 is 17.4. I suspect at that time I decided to go with the Lyman data just to be on the conservative side. From here on out I'll have at least one more data source if available.