I am just an amateur gunsmith.
I have converted a VZ24 to 7mmRemMag for myself, as well as a couple of 1908 Braz Mausers.
I had to change the bolt face and extractor. You would not have to do that.
But you would open the feed lips.
Walsh made a drawing of how to open feed lips in the receiver for the magnums.
http://www.amazon.com/dp/187935652X/?tag=lrhmag19-20
Here is a list of some of the stuff I did, what it cost, and what it weighed
A) Brazilian 7mm Mauser VZ24 action stripped from rifle, $137 Century 3/2009 36 ounces
B) Lothar Walther CM 1300 taper 7mm 26" Barrel blank $185 Brownells 5/2009 53 ounces finished
C) Standard 7mmRemMag reamer, .45" drill, .47" boring bar in 4 step chambering
D) High Tech Specialties [Bansner] stock $202 Brownells 4/2008 20 ounces
E) Weaver #S45 and #S46 steel matte scope mounts $16 Brownells 2 ounces
F) Limbsaver large recoil pad untrimmed $29 Brownells 8/2008 7 ounces
G) Oxpho Blue Cold Blue
H) TIG welded bolt handle, and bolt handle extension.
I) PAWS Aluminum bottom metal for Mausers weighs $65 Brownells 3.5 ounces
J) Rear hump of trigger ground down and reduced trigger spring installed
K) Feed lips milled .51" Wide and 3.5" long
L) Bolt face opened to .532" with carbide tools on lathe and mill
M) Extractor claw relieved
N) Wooden plug epoxied into hollow cut off stock butt ~ 2 ounces
O) Headspaced to .215", not SAAMI .220"
Q) Kahles Helia 3x10x50 scope with multi zero turret $630 CDNN 6/2010 16 ounces
R) Allen buttstock pouch, $12, 6.5 ounces with two rounds
S) 9"-13" Harris swivel bipod, $100 14 ounces
T) vero vellini 3.3" wide V19023 Wide-Top Black Sling $25 5 ounces
U) Weaver quad lock 1" high extension scope rings $12 ~~ 3 ounces
V) Devcon steel putty epoxy under 1" of barrel, behind recoil lug, below tang, above bottom metal, under scope mounts.
W) Loctite 242 blue on scope mount threads
X) Rust-Oleum camouflage paint 1919 deep forest green on stock
Y) Doggone good 2"x3"x4"rear field bag $35 9 ounces
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$604 + $630 scope = $1234
177 ounces = 11.06 pounds calculated
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weighs 11 pounds on scale
150 gr Nos Bal Tip 66 gr H4350 3250 fps average.
It shoot sub moa at 100y.