I've got several hundred cases dating back to the mid sixties.  I handload all my ammunition, mostly lead slugs.  Two favorites come to mind:  173 Gr Lyman #311291 and 210 gr Lyman #311284.  Both of these bullets are available on the 'net.  Try:    (You need to Login
There are others.  My 311284 are cast by me.

However, I have a hog hunt lined up in Feb and I plan on using 220 grn Hornady Interlocks .  It may be loafing at about 1800fps but that'll make 'em do the Jihad Jig w/sqeal.  Bullet # is 3090 and available at Midway:    (You need to Login

Now, as far as new brass goes, you'll need to check with your local suppliers for the brass and for loaded ammunition.  Winchester does do some runs from time to time.  When you see it, buy it!

Have fun.  These are real rifles and thankfully, some are left for shooting!

TL