Finally got out to shoot three 124 plated HP loads and one 147gr load.
The good news, two were Sub-Sonic but the accuracy was poor.
The Green Dot did 990fps and the Unique did 965fps but no POA.
The other was 5.4 grs. of HS6 but it had two err's, one real low reading
and a high of 1018 that listed. With all the problems of this load
it was probably not enough powder in the case.... as loaded. OAL 1.075".

I will go with the Green at 1025 or the Unique at 1034 as my POA accurate loads
for light target work in my 5" pistol.

The LONG Berry 147gr RN plated bullet with the starting load of w231
did well, with a 866fps that matched the Lawman factory ammo.
It was just 3/4" from POA and will work for light target work.
It had a +/- ES of 24 and printed a 1.11" group off a rest.

Next test will be in my short C9 w/o the chrony, just to see if it likes these loads.
Stay safe.

Issue with GD may be poor metering? If you have Reddot, give that a go fir light loads, always accurate. WST is my go to for soft 9mm, 124 or 147.

__________________
NRA Cert. Inst. IDPA CSO

With this plated 124 gr HP type bullet, I tested fps and OAL with

Bullseye
Red Dot
W231
Green Dot
CFE pistol
BE-86 ........ ( 1.075" @ 1220fps )
Unique ( 1.13" @ 1212fps) (1.075" @ 965fps )
HS-6 and
SR4756

While ball type powders do meter better than flake type powders.
Use caution if using HS-6 in the lower starting areas.
I was working toward the starting load and my test load had a 221 ES !!
Some manuals start a little light for my pistol.
Stay safe.

In my experience, that is a sign of either inconsistent powder charges or inconsistent burning of the powder or a little of both. Medium and slow burning powders tend to burn at inconsistent rates when loaded at minimum starting charges. Typically, they are more consistent and cleaner burning at the middle to maximum safe loadings.