Yes, 25g has worked on every type I have used (conan69 doesn't think the t400 will go through it, but that shit ain't comin' near my ass anytime soon).
You will notice some sides though, less scarring, less pain, thinking the 23g are huge, etc.
I wold say a 25 would work...and agree w/ Tx on the 20 to draw it up (side note...I ran out of 22's and had to shoot w/ a 20 the other day... ...naw...it was pain free)