JMHO,of course.
Think of the .40 SW 135 grain loads as ya would a .357 magnum 125 grain load.
Faster, lighter,faster expanding, less penetration.
They hit hard and fast,for defense ya could do worse......BUT!!!!!!!!!!....
Keep in mind bullet weight ,and speed will effect aiming.
A faster, lighter bullet will shoot lower than standard sites.
I remember when the SW.40 round first came out,
I remember the tests of bullets....
A fast moving 135 grain .40 caliber bullet ....is EXTREMELY effective...
At close to middle range....just never saw one accurate at 25 yards plus!
"I was told that it is a surplus high velocity round that was made for the Border Patrol or some other federal agency. "
One of my house guns is a SW.40.
I prefer 155 or 165 grain bullets.
But honestly, yer 135 grainers sound find too.
