Re-birth:shooting DWM first serie P.08- Loads

[JONABI]

After over 28 years sleeping, I reassembled my P.08 in late winter 2019-2020. Began shooting only in may because of COVID-19 at the firing range; the interior club was closed. I've been shooting Federal AE 124 Gr FMJ/1150 f/s. I've been using two mags, one OEM from the same era and one from WWII. The first one loads and function perfectly shot after shot. The second one, more or less the same. Now that I've spent all the Federal, I'm trying a reload from a manufacturer. It's a 124 Gr 1100 f/s FMJ with a small truncated cone. I've shot 200 rounds at least, at the firing range with temperature below 32 F°. It seems that power is sometime a bit short to completely load the round and close the breech. Sometimes the hold open function does not operate, particularly with the second magazine. Does anyone know what powder is used in the Federal 9mm Luger AE 124 Gr ? Picture shows a124 Gr FMJ somewhat a little truncated and to the left a 115 Gr FMj Federal