Did notice that they are push feeds, but that doesn't get my knickers in a knot.
That got mine in a knot. They had such a great action with the 550, why mess with it?
$$$, they are trying to market to a lower price point and the 557 is less costly to build. Nothing wrong with that(or the 557). Have not shot one however my grandfather won one in a gun raffle last year in .270. Let you know how it shoots if he ever uses it(he might I think, I know he is not too fond of his current deer rifle).
