.308WIN to .338FED...?

[patriot53]

Does anyone KNOW, for sure, whether the relationship between
.308/7.62x51 caliber "change" to .338 Federal, in an AR10 "type" rifle...
...is similar to the change from a 5.56/.223 to .300AAC Blackout,
in that ALL that is required is barrel change...because in the case of the 5.56NATO/.223REM. the Bolt face is compatible with .300 Blackout, as is the magazines.

Thanks

 

[HOOfan_1]

The .338 Federal is just a necked up .308, so the bolt face will be the same. The overall length is pretty much the same too, so I don't see why the magazines wouldn't be the same

 

[patriot53]

The .338 Federal is just a necked up .308, so the bolt face will be the same. The overall length is pretty much the same too, so I don't see why the magazines wouldn't be the same

Any issues with "FEED RAMPS" ...
...BOTH in the feed ramp portion of upper receiver and feed ramp portion of barrels?

I have been told...very confusing, that in a AR15 "upper receiver" ...as well as AR15 barrels there are "M4" type, deep-cut/angle FEED RAMPS vs. non-M4 "type" or "A3" ramps?
Then at Daniel Defense website...further confused as they call theirs "A4" feed ramps and say that that is the deeper cut/angle "type"?
So "M4...A3...and now A4" which seems to sound like a "hybrid term" of the 1st TWO???

However...I was talking about AR10 "type" of rifles in 7.62x51/.308 and switching calibers to .338 Federal, with just a NEW barrel in that caliber...
...if you could do that on a Rifle like LaRue PredatOBR...
... "quick change barrel / suitcase rifle", WITHOUT these "FEED-RAMP" matching issues, that 5.56 vs. .300AAC BO. suffers from as, uppers & barrels, apparently use differing feedramps that MUST be "matched" barrel to upper?