I built a .300 Ham'r with an 18" AR barrel from Wilson Combat. I even had a .223 RAR, that I planned to convert to .300 Ham'r, but my donor was an older one with the rotary magazine. Evidently, the Wilson conversion barrel only works with the newer version that takes AR mags. Bummer.
I've loaded several different bullets with my .300 Ham'r: 110gr Hornady SP, 125gr Speer TNT, 125gr Sierra SP, 130gr Speer HP, and 130gr Speer FN. They all shot well, and I killed pigs with all of these bullets, except the 110gr Hornady. I am going to try the 135gr Hornady FTX, this year, just because.
I haven't tried the Barnes 110gr Tac-TX in the Ham'r. I have loaded them in .300 Blk, and just looking at the Barnes bullet, it seems really long. I'm not sure it'll fit within an AR mag with the longer Ham'r case length.
I have only used CFE-BLK powder and CCI 450 primers to load .300 Ham'r ammo. They worked great, so I haven't monkeyed with anything else.
I tried my hand at making brass from R-P .223 Rem brass, but I had a lot of cracked necks, so I bought .300 Ham'r brass from Starline. For 32-cents a piece, it's worth it to save me the time and hassle of making my own.
So, in summary:
Buy pre-made brass.
Use CFE-BLK powder.
There are LOTS of great 110 - 135gr bullets available to choose from.
The .300 Ham'r smacks pigs with authority, and it's a bunch of fun to shoot.
Edited to add:
I bought both an AR upper and complete AR rifle in .350 Legend for an upcoming pig hunt. In hindsight, I wish I would have just built another upper in .300 Ham'r. Both of my 350 Legends had feeding/cycling issues that took time and tinkering to get corrected. Both 350's are running like they should, now, but the .300 Ham'r would have been an easier (and cheaper) option, with MUCH less hassle.
Last edited by DanInAlaska; 12/20/23.
