Just loaded up some new SNS Casting 180gr Round Nose, non grooved, with 4.6gr N320 @ 1.180" from a 5" STI Edge.
Made 169.0 pf
Really smooth shooting and has been very accurate in my Edges.
Have you pulled any of the bullets that you're having issues with? Molds can have some variation from one to another, I would try further measurements on the good rounds compared to the iffy ones.
What powder do you like with the 200 RN? I just picked up my first batch of them to try.
I love Solo1000 but it's been impossible to find. My major match load is 4.1gr Vihta Vuori N320 @ 1.185" OAL shooting a STI Edge.
I have also used Autocomp and Ramshot Competition with good results.
Were you using a ransom rest? It would also be great to know your OAL and seating depth for each. ES is not a true indicator of accuracy in this case if the groups didn't come from a solid ransom rest IMO
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That bullet is very finicky, which is why several manufacturers have discontinued that bullet profile all together. I'd suggest a bullet with a longer ogive, there are lots of better bullet designs out there!