What I have used for max vel loads in the past. These will do about 950-1000, which is what
the 125 Rem is spec'd at. No special reason. If TG will do the same POI and reasonably good
velocity, that would be fine. Never noticed flash with PP, but never tried it at dusk or dark.
OK, I checked and 5 gr of TG will do about the same, so may do that.
Ultimately, only Mr. Target knows the answer.
Bill