I run 6.2gr on a 115 JHP at 1.125 and it was nice and soft through a Sig 239.
Have you tried 6.2gr seated at like 1.130 with round nose FMJ ? If seating on the deeper side, you may be running at +P pressures depending on that brand of bullet. Alliant lists 1.120 as the MINIMUM OAL for their load data.
Also, make sure you are accounting for variation in your presses seating depth.
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