Re: 7mm Rem mag rechambered to a 7mm ultra mag.
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I answered on another forum but I'll answer in detail here. To do your conversion correctly you will need to do the following :
Remove the barrel and index so the writing is down and you have a clean surface to engrave "7mm RUM" on.
You will have to punch the chamber itself out.
You will need to set the boltface recess back.
Change the box magazine to the window styled magnum box.
Change the follower to the ground mag follower.
Open the feed rails slightly
Remove the sharp bumps at the feed ramp
Engrave the barrel
and test fire it.
I would in addition if it were mine install a Wyatt's extended box mag instead of the rem window box and modify the feedrails for better feeding. This step is not necessary but makes the package much better with feeding and allows a longer OAL.
If you are interested in price drop me an email. Hope this info helps.
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Thanks for your help.