I've had 2 Swift's and they both shot well(great) w/414 & CCI200's. Didn't have a chrono back then so didn't worry about temp sensitivity. Killed coyotes winter, spring, summer or fall! Oh, I only used 60 gr. bullets,
for the same reason you want to use 55's.

"The more I am around people the better I like my dog." Mark Twain