RK . My own experience with Unique has been in .44 and .45 cases. I did observe when pressures are low unique seems to get erratic. These were big volume cases and I got a lot of vertical stringing in the 44 mag and 45 Colt. Function in the auto was erratic. An equivalent velocity load of Red Dot functioned fine. I did not have a chronometer so I was using the Speer loading manual for velocity estimates. I am a fan of Unique but in medium to heavy loads.
A hotter prime might cure the problem but you need to back of on the load to try that. Hot primers can have suprising results. Try the Red Dot.
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