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[Smellydog]

If there was no pressure signs go up some more.

 

[NP435]

The twist rate recommended by Sierra is 1-9 that is very likely the source of the troubles.

 

[Smellydog]

The twist rate recommended by Sierra is 1-9 that is very likely the source of the troubles.

Recommended not necessarily mandatory.

It's not just the number of turns but the number of in time.
Shorten the time or in other word increase the RPM you can influence (possibly, not always) the stability.
The op has the bullets, no pressure sign, keep going is what I would try.