Pretty much been my experience also. Never used N110 in the .357 Mag (only in .44 mag).

Different guns give different velocities. For example, I have two 66-8's, one 4 1/4" and the other 2 3/4". The 2 3/4" gun gives equal and sometimes higher velocities vs. the 4 1/4" (depending upon load). Also, temp will impact velocity.

Here are results for 158gr XTP, 15.0gr A2400, Starline cases and standard small pistol primers.

4 1/4" M66-8
Competition Electronics
Velocity at 5 Long Paces from the muzzle
40 deg F

1,294 fps avg for 5 rounds


2 3/4" M66-8
LabRadar
Velocity at Muzzle
60 def F

1,316 fps avg for 5 rounds.

Different chronos, diff distance, diff temps noted on above.

FWIW, VV lists 16.3gr N110 as max with the 158gr XTP -- however, they are using "All the loads on these pages are pressure tested according to the C.I.P. method" vs. SAAMI for A2400.

Anyway, chronograph results can drive you nuts - at least that's been my experience.

Paul