Rebarreling the Remington 7600 just got a lot easier because of the one piece barrel trunion made by these folks. Check out the website below.

Lumleyarms.com

How much

135 list
74xx and 76xx
http://lumleyarms.us/index.php...ath=40&product_id=60

I have 2 on order right now. One will be for a 338-06 build, The other is just for stock.

The website indicates that these could facilitate a 'quick change' barrel arrangment. Does that sound right....a relatviely quick change out from say a .243 to a .358?

Fairly quick. depends what quick is.

The old 760 was a relatively easy switch. Just unscrew the barrel nut, pull out the barrel from the receiver, spread the action bars and take out the barrel. Reverse the process to install a new barrel. I did it quite a bit and I still have several extra barrels. I have a .30/06 and a 9.3X62 on the same frame. You just have to check the headspace. There isn't a way to adjust it except by switching out bolts.