[Rex in OTZ]

Buffalo Arms - Product Detail - 7.65X53 Argentine Mauser Cases - $0.56 brass
.300-.329 Diameter Jacketed Bullets | Shop .300-.329 Diameter Jacketed Bullets at Buffalo Arms

http://www.grafs.com/catalog/category/categoryId/240

They are indeed good rifles as long as reloads are kept in the proper pressure range. You can get brass and ammo for 7.65 Mauser from Norma, but i find it a whole lot cheaper to make the cases from 30-06 cases. Just anneal them, full length resize, and trim to length.
As to making brass from .30-'06, just be aware that the base size of the 7.65 is larger than that of the .30-'06 so cases made from the latter tend to swell when fired. This normally is of no concern, but just something to know and watch for any problems.

ARGENTINE Mauser 7.65X53 Ammunition
Introduced: 1889
Countries Used: Belgian
Bolivia
Columbia
Ecuador
Peru
Turkey
Other Names: 7.65mm Mauser
Type: Rimless, Necked
Centerfire
Overall Length: 3.06"
Avg. Wgt: 417 Gr.
Type Pwdr: Nitrocellulose
Approx. Chg: 39.5Gr.
Primer: Boxer, Berdan 5.5mm
Cartridge Case:
Length: 2.09"
Lngth Head to shoulder 1.75"
Shoulder length: .10"
Neck length: . 24"
Dia. At Rim .474"
Base: .470"
Neck: .340"
Shoulder: .425"
Bore . 301"
Groove . 311"
original Argentine production 7.65mm bullets mike .3115.
Twist: 9.8
BULLET:
Type: Jacketed Rnd. Nose
Dia. .311"
Wgt. 1)150
2)174
3)175
4)180 Norma
5)185 BT Military
6)211 Military
7)150 Norma SP

M-Velocity: M-Energy:
1)2810 f.p.s. 2638 ft.lb.
2)2590 2600
3)2560 2550
4)2590 2685
5)2467 2510
6)2132 2150
7)2920 2841

Length: 1.20"
BALLISTICS: (Approx)
Pressure: 39000 lb./sq.in.
Twist: 10"
Cases can be made from empty 30-06 or 7.7mm Jap Brass Bullet sizes which can be used with reasonable accuracy .311/.312



.311 diameter bullets are available in 150 and 180 grain weights. Load data is kind of scarce, but for those two weights it can be found.
By the way, i too have had good luck in obtaining parts for them from the Gun Parts Corp.