Those spreads & poor accuracy is normally what's encountered just before you learn tg is peaky.
I'd dial that charge back a scooch. A dab more crimp could help to. I doubt the same test will net different results unless you tighten the crimp just a smidgen, or dial the charge back with your current crimp. Those spreads & poor accuracy is normally what's encountered just before you learn tg is peaky.
I wasn't sure if he meant .357 bullets but, the lcr is a 38 maybe. Or if the lcr is a mag. Then we didn't get the charge or bullet weight. So was urging caution because 357 data is ALL over the place as far as charge weights go.
I load for my mother's lcr in 38. The bullets must be .358-.359 for it. I don't recall how much tg the load is but, wanna say 3ish gr under the lee 140swc for somewhere around 700-800fps iirc. Very clean, moderate, & accurate.
If the crimp is good & it's not an inconsistent ignition issue, which is normally not the case with tg then, I'm guessing your just past its happy zone. That does happen in numerous loads where it craps out just before 1k. Some book data for 357 doesn't jive as starting loads for some of today's tiny light weapons. I always get 2 or more data sources for 357 specifically because of that.
Edit to add-
the only way I can maintain accuracy at the top end with tg is to use a tougher bullet/alloy. It's the top performer in 380 acp but, the bullet must be tough enough or accuracy is gone.