I used several powders...each rifle seemed to have a different preference. One rifle was a way old Ruger tang style. At that time Ruger used a different receiver for the 220 Swift for some reason. The other two were both Ruger Target models.
I used the old and now discontinued Nosler SB 50 gr when I was pushing the velocity and IMR 4064. 4064 back then was considered "THE" powder to use and it did give the best accuracy, and IMR 4320 was another great one. I also used Sierra 50's but sometimes they wouldn't reach the target. When pushed you would get a grey puff of lead around 50 yds, but I usually ran the Swift around 3900 f/s with 50-55 gr. The barrels would last much longer.
The Swift's usually held 1/2" accuracy through 2500 rnds or so and below 1" out to 4000 when I kept the velo in the 3900 f/s range. I went to the 22-243 because I could get well over 4100 f/s with 50 gr bullets at about 50 KPSI. I use my rechambered TC Encore for 300 yds or beyond only or when the wind isn't blowing, so the barrel will keep going, and going, and going.
I still use Nosler BT's most of the time because they just seem to be more accurate, but VMax's are another favorite, it just depends on what the rifle likes.
H380 is also very good in the Swift. Very uniform through the powder measure and no surprises. It burns cool and doesn't seem to erode as much as the other hotter powders, but that also depends on how fast you shoot. The bigger cases burn a lot of powder, get warm fast, so I tend to shoot them slower than my 223. Varget and RL15 are very good newer powders to use. I've used a lot of H380 in my 22-250, 220 swift and 22-243's over the years. H4350 works well in the 22-243 with 60 + gr bullets.
H414 is a good powder and I used it for one 85 gr load in my 250 Sav AI for a while and in a 30-06 with 150 gr bullets. You have to be careful with any ball powder when you get magnumitis and start pushing the envelope. I've had several pressure excursions...read spikes and bad surprises...with several ball powders including H414 and H335 so I tend to stay with log powders of similar burning characteristics. I now use RL15 in the 250 AI.
Happy Holidays
'Njoy
