Pete,
What twist is the barrel on your .220 Swift? The reason I ask is my experience is sometimes spotty accuracy in the classic 1-14, but much better in faster twists from 1-8 to even 1-12 in various cartridges from .223 Remington to .223 WSSM and .22/6mm Remington.
Heard way back when the 60 Partition was introduced that it was designed around the 1-12 twist of most .223 Remingtons back then, which would make sense.
Have used it on animals as small as prairie dogs (in a 1-12 twist .22 High Power Savage 99) and as large as deer with great results--except for the spotty accuracy in 1-14 twist .220's and .22-250's.
