I haven't dabbled in lever specific bullets a whole lot, despite being very lever-centric. I had not heard of the Swift versions. I'm intrigued but my intrigue would likely get checked at the price.
Like
@rookhawk said, the LEVER stuff is really good. I was skeptical of the FTX bullets at first, but after 8 bull moose, a crap-ton of caribou, and 8 African animals, to include a couple of kudu bulls and a large wildebeest, I am no longer skeptical. They work; I trust them.
I shoot a 170 grain Partition out of my .30-30 (Savage 24). This bullet is made for the slower velocities of the .30-30 and supposedly will open nicely at those lower velocities. I have yet to kill anything with one yet.
Other companies - like Cutting Edge and Maker also produce stuff designed to open at lower velocities, so there is stuff out there. It's a matter of what do you want to pay.
I will also say that the factory LEVER ammo is the most accurate ammo in several of my rifles. I can handload for every rifle I have, but a few of them I have sighted for the factory LEVER stuff because it is so accurate.
I'll be toting a Savage 99 for Sitka blacktails next week. I put together a .308 load using the 160 grain FTX bullets. I think they'll do just fine. Right or wrong about that, I'll let folks know when I get back.
Have a terrific weekend everyone.