You've got a fine weapon & I'd rate the cartridge as better for self defense than any .32ACP and .380 FMJ, and perhaps about equivalent to the best .380 JHPs. (It won't expand like
some .380 JHPs, but it will penetrate deeper than anything in that caliber, I imagine.)
I've posted quite a bit on this forum about my "experiments" with various bullets in this caliber, and I'm definitely a fan of a flat-pointed 200g bullet at low 600's velocity. That's nothing but the British Army service round of the 1930s, itself merely a blunt-nosed version of the American ".38 Super Police" round of that era. (There was also a .38 Special "Super Police" 200g load.)
I sometimes carry a Mod. 32-1 or 33-1 (4" barrel) loaded with 200g flatpoints, and my wife carries a 32-1 in the car and keeps a 33-1 for home defense. Even from the snubbie, it punches straight through 6 gallon jugs of water--some estimate this equates to 18" in ballistic gelatin. NOT shabby. [
CORRECTION: into 6th jug from a snubbie 2", thru all six jugs from a 4" barrel.]
Although Old Western Scrounger is backordered on his 200g load in this caliber, you may wish to check with him & get some when you can. See
38-200 British 200GR Lead [38200] - $34.95 : The Old Western Scrounger LLC. You'd gain penetration, but as a trade-off your point of impact would be higher than with factory ammo. To me, that's not a problem for HD and SD, as engagement ranges & conditions make it a moot point if the bullet hits 2-3 inches above the sights.
BTW, a few months back I came across a number of boxes of modern Remington ammo at Bass Pro for about $26 per box. Not too bad compared to many calibers.
Happy shooting, and best of luck in learning to shoot your Terrier rapidly and accurately at short range. That's what it was designed for, and it does it very well.