300 HAM’R is a new proprietary round from Bill Wilson of Wilson Combat.
Short course: in its performance, 300 HAM’R is a significantly ramped-up .300 Blackout.
Bill’s goal was to approach .308 Winchester levels on a round that’s compatible within standard AR-15 architecture.
Like Blackout, it fits a standard .223 Rem. bolt face. Simple swap. It uses the same magazines and provides the same round capacity as Blackout also (more on that in a bit).
Wilson based 300 HAM’R on Kurt Buchert’s proven-good-but-obscure 7.62x40mm Wilson Tactical (WT) that’s been available from Wilson Combat for years.
(Wilson offers over 20 different chamberings for its AR-platform guns).
Much patient (and creative) experimentation refined that round into the 300 HAM’R, and it’s now been SAAMI-certified and can be had as a complete package (for buyers or builders).
HAM’R cases are 0.040-inches longer than the WT and a whopping 0.260 longer than Blackout.
From that, the result is an easy +300 feet per second beyond Blackout with 110-135-grain-range .308 bullets, which means a solid 2600+ fps with a 110-grain.
For hunters, that means +400 ft./lbs. muzzle-energy increase. 300 HAM’R closely matches good old .30-30 Winchester, and that was Bill Wilson’s goal.
Currently, ammo, brass and dies are available from Wilson Combat. As with any new round, how far and quickly options range all has to do with popularity.
As said, 300 HAM’R is SAAMI, so development will be documented by major industry component suppliers.
Me being me, I put together my own HAM’R from Wilson Combat brand parts, including barrel and handguard rail.
As said, and as always with Wilson Combat, you can get a complete gun, complete upper or the components separately.
I chose a 16-inch 1:15 twist Recon Tactical profile from Wilson Combat and a carbine-length gas port.
Even though the HAM’R is running higher pressure than SAAMI ceiling-sets for a Blackout, it’s nowhere close to standard now for 5.56 NATO.
No need for pressure abatement precautions. I see normal spent case condition and nothing like extraction failures.
.300 Blackout has become a popular whitetail deer hunting round (around where I live, anyhow).
Given that I keep a goal of 1,000 ft./lbs. of energy at that animal, that means the viability of Blackout as a reliable idea is all about distance, and it also means that it’s edgy beyond 100 yards with most commonly available factory loads.
Given that it’s starting at +400 fps ahead of Blackout, 300 HAM’R greatly extends the confidently effective range for hunting.
Of course, bullet flight path and behavior are also all bumped up along with the extra power. Bill says it’s been dropping Arkansas wild hogs like bad habits.
One more point, and a most fortunate one. This HAM’R hammers!
Not all exquisitely accurate cartridges follow the “PPC” or “BR” blueprint-profile.
Rounds like 7mm TCU shoot very small groups using a bigger bullet, smaller case formula, and so does 300 HAM’R.
Unfortunately, I still can’t get much past 50 yards around here due to the remnants of biblical-level flooding this past season, but my groups from that distance with this HAM’R were about the size of one shot from a .45.
Some of that no doubt results from the excellent Wilson Combat match-grade barrel. These have become the new go-to for me over the past couple of years.
I am looking forward to getting farther into this cartridge as soon as I can.
Conclusion: 300 HAM’R
On the front end, I’m really big on this 300 HAM’R. More power than Blackout, no matter what, and also no matter what it’s used for.
However! There are also just no trade-offs I can name keeping a straight face. It can’t replace Blackout as a subsonic, but it’s dang sure replaced for me otherwise.
Magazine Note: Yes, a standard 5.56/.223 magazine usually functions just fine and dandy. But, it’s best to get magazines engineered for 300 Blackout. With either Blackout or 300 HAM’R, look at the rounds loaded into a magazine box and see that the larger diameter bullet in the shorter case sits down lower, nearer to the follower ridge. For reliability, no little bit of the bullet should touch that ridge, and there are some improved designs that incorporate changes in this area.
What do you think of 300 HAM’R? Let us know your thoughts in the comments below.