[Powderman]

You didn't list the caliber, but from the bullet you listed, it sounds like 9mm Parabellum/Luger.

Going to the Alliant Powder website, and entering their online Reloader's Guide, I see a recipe for a 147 grain Speer Gold Dot HP that states a max load as 4.3 of Unique, with your same primer, and an OAL of 1.13 inches. The difference in OAL might well be the length of the bullet.

You have reduced your start load, which is good--even though with the 4.0 load it's not reduced 10%. From my experience, you should be safe.

For your first range outing, take your calipers with you. Measure the following before firing: diameter of the case measured at the web (down near the extraction groove, and the diameter of the case head (rim) itself.

Load and fire ONE round only.

Now, perform the same measurements again. There should not be any substantial change.

Also watch for:

Swaged out primer (the groove between the outer radius of the primer when seated and the primer pocket wall seems to have disappeared);

Bright circles on the outer part of the rim (the impression of the extractor recess)

Headstamp ironing (the headstamp being made indistinct or blurred)

Any of these tell you that your load is too hot for the pistol. Back off on the powder charge.

If you see any of the following:

Blown primer (a hole punched clear through the primer cup)
Bulged case (a bulge right at the case web)
Primer completely MISSING...

These are serious DANGER signs. These signs are telling you that you are on the knife edge of disaster; in short, you are dropping the hammer on a BOMB.

Remember to use a nice, tight taper crimp for your loaded 9mm ammunition; this will prevent bullet setback (the bullet being forced deeper into the case upon feeding). This can easily TRIPLE chamber pressures, and will more than likely blow up your gun, and cause your injury.

Best of luck to you! Post results when you can make it to the range.