In addition to doing Underclocked's work for him last week end with the Great Plains experiment , I added three more data pointsto my earlier experiment of shooting the same bullet & sabot combination over a chronograph,starting at 65 grains weight of T-7 FFFGand working my way up in five grain increments.

In the first experiment I shotfour sets of weighed charges at65,70,75 &80 grain weight.

Last Saturday I shot85,90 & 95 grain weight charges.

Allcharges were loadedunder300 grain Speer Gold Dot Hollow Points and Harvester Crush Rib sabotsand setoff with CCI small rifle primers in a 25 ACP breech plug.

Here are the average velocities for each load.

Grains Of Powder Average FPS
Weight= VolumeFive-Shot Groups Group Size

6574.7 1635 3 1/8"
7080.51624 (-11 fps)4 3/8"
7586.21660(+36 fps)2 7/8"
80 92.01698(+38 fps) 3 1/4"
8597.81775 (+77 fps)4 1/2"
90 103.5 1822 (+47fps)3"
95 109.31829(+7 fps)3 3/4"

As said earlier, I really can't explain why 65 grains had a higher velocity than 70 grains.