I've never loaded a cast bullet that light in a .38 Special but it sure sounds interesting, especially with Bulls-Eye.
Here is some load data from the Lyman 46th edition manual. It shows a different and slightly heavier bullet so one would obviously need to work up any loads.
Lyman No. 358425 cast lead, 112 grains
Bulls-Eye powder
Suggested Starting Grains: 2.0
Max Grains: 3.8
The later Lyman "Pistol and Revolver Handbook" from the 1980s lists the following.
Lyman No. 358242 cast lead, 121 grains
Suggested Starting Grains: 2.8
Max Grains: 4.6
+P (their designation) 4.9
An old standby for target shooters is 2.8 grains of Bulls-Eye under a 148 grain hollow base wadcutter so that charge weight or less would surely be safe and mild.
I'd feel confident that your 105 grain bullet could be worked up to 3.8 grains of Bulls-eye. I've used up to 3.5 grains of Bulls-Eye with a 158 grain cast lead SWC bullet. Best accuracy and utility for target shooting would likely be had at something less than that 3.8 grain maximum charge.
The later Lyman listed max charge weights of 4.6 to 4.9 grain charge of Bulls-Eye, as listed for the 121 grain bullet, would also likely work fine with the lighter 105 grain bullet but would likely reach well over 1000 fps. Seems like too much of a good thing to me but I'd be most interested in creating a light recoiling target load.
Start low and work up.
If you come up with a good lightly loaded target round using the 105 grain bullet, let us hear from you.


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