9MM powder/load question-Need help :)

[Jim F. Barham]

Jim, member. I need a little help on reloading for 9mm. 8th ed. Hornady handbook shows 124gr. fmj-rn, using Unique, 4.0 - 5.0 gr., while Speer handbook shows 5.2 - 5.8 gr. This variation perplexes me. I have been reloading for over 40 years, and recently got a Dillon 550B. I reload for 7 calibers, but using the Hornady figures, i have had several failure to eject because of insufficient power. Anyone out there willing to help? Thanks, guys.