Hi all. I'm working on a small sub-collection as a part of my bigger set. I'd like to get samples of all the cartridges one could find typically chambered in an AR15. There are a tons of wildcats and off the wall stuff floating around, but I am going to confine this to more 'normal' or mainstream offerings.

I already have some, but I see as I'm going through my list that I am missing:
5.7x28 FN
6.5 Grendel
300 Fireball
450 Bushmaster
458 Socom
50 Beowolf

I'm sure I could buy these from various places as singles, but I was hoping to do some bartering. Below is a list of brass (a small portion are live rounds) I have at least one extra of and would want to deal with. Even if you don't have anything I specifically named above, feel free to contact me if you need any of these and I'm sure we can work out some kind of trade!

"========== rimless rifle =========="
204 Ruger
5.45x39
22-250
243 Win
257 Roberts
25-06 Rem
6.5x55
6.8 SPC
270 WSM
7mm RUM
7.62x39
30-06
308 Win
300 Savage
30 Rem AR
8x57
325 WSM
338 Federal
338-06 AI

"========== rimmed rifle =========="
30-30 Win
7.62x54R
303 Brit
8x56R Hungarian
375 Win

"========== belted mags =========="
264 Win Mag
7mm Rem Mag
300 Win Mag
338 Win Mag
458 Win Mag
270 Wby Mag
300 Wby Mag
340 Wby Mag

"========== handgun =========="
7.62x25
32 S&W
380 Auto
357 Sig
9mm Luger
38 Special
357 Mag
40 S&W
10mm Auto
44 Bulldog
44 S&W Russian
44 Mag
45 Auto
50 AE
500 S&W

20 Practical - Weaver Rifles
22LR - Spikes Tactical
5.45x39 - Smith and Wesson
.222 Remington - Colt
.223 - Remington- DPMS (one maker added by me as common knowledge- there are probably 50 other makers)
5.56mm NATO - Colt
WSSM .223 - Olympic Arms
WSSM .243 - Olympic Arms
6x45mm by High Standard
WSSM .25 - Olympic Arms
6.5mm Grendel - Alexander Arms
6.8 Remington SPC - AR15 Performance - see Barber 2678's and Globmaster3's notes
7mm TCU - SSK Industries
.300 Whisper - SSK Industries
.338 Lapua - Bohica Arms
.40 S&W - Olympic Arms
10mm - Olympic Arms
.45 ACP - Olympic Arms
.450 "Thumper" (Is that a proper name?') - Bushmaster
.458 Socom - RRA or Tromix
.499 LWR - LWRC
.50 Beowulf - Alexander Arms
.50 BMG - Bohica Arms