My first 455, a .22 mag I bought on a whim on a vistit to the old Green Top, was fairly accurate with that barrel and the LR barrel, but feeding was iffy with the LR. Probably could have tweaked that out, but the whole barrel-swapping thing wasn't as alluring as I expected. My current one in LR and SS, is a solid rifle with a very nice trigger as-is, so should stay on unless I have one of my spasms and trade it off. A SS 457 might tempt me, but might not too.
