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Mate there are plenty of cooler rounds around, the Edge is the 223 of the 338s but it is simple & cheap to build.

I have a 26"one for sale :)

The 338 Norma is really gaining ground against the...

Lol, I have two at the moment.......it is a very economical, sensible, consistent, 338 that preforms very well, whats not to like.

I know someone else that has two & another 4 guys that have...

The bolt face is the same, the feed rails might need to be opened up, any 700 LA magnum will do, a Rum would be the easiest :)

It looks like the Sin is made from Dakota brass, which has a slightly bigger bolt face........

You could rechamber to 30-375R which has the std magnum bolt face & is the same length as a 7mm Rem...

If he wants to build an Edge he just needs the std .532 magnum bolt face.....

Lol, spot on there :D

Most guys that open the Std or magnum face up to Lapua use a Sako extractor, not a m16 type that has a pin through it & is much less likely to come visit you if there is a major issue/catastrophic...

I won't build a Lapua or Norma mag boltface on a 700 either unless it has a M16 type extractor like a 700P or PTG etc aftermarket bolt.