A lot of people get confused on the 300BO. It is really two separate cartridges (at least power levels):
1) Lighter bullets at full power loads (supersonic) that comes very close to the power level of a 30/30 that has killed deer very efficiently for a LONG time.
- The full power loads at modest ranges work just fine. They have a mild recoil & report. The only advantage however is a 30 caliber cartridge in a 2.26” COAL. (Fits in the AR-15).
2) Downloaded powder charge to eliminate the supersonic crack of the bullet (subsonic loads).
Subsonic loads are only sensible for suppressed rifles. Without suppression, the report is still comparable to a shotgun blast (not as severe as a centerfire but still plenty loud). For just a little more noise you can get “real rifle” performance. However, add a suppressor and report is similar (or can be even quieter) to a pneumatic staple gun. The bullet hitting is louder than the other end… Still the type rifle used, powder, “muffler” efficiency & volume; are factors in noise level. Some are noticeable & some can be downright discreet.
Here in lies an appealing quality that may attract certain people to the 300BO & I think is one of the main factors the cartridge has gained popularity.
Yes, you can download a 30BR, 308Win or even a 300WM down to subsonic velocities (~1100 fps depending on environmental conditions). However, if you’re trying to get the best accuracy; the smaller case volume provides the lowest speed variables (es, sd VERY important once doping at the speed of smell). (If you’re after the best you can get in subs, the 300BO is about it).
As stated earlier, shooting subs in 300BO brings the same perils of the LR shooter into a compact zone. The perfect load to eliminate vertical dispersion is exponentially difficult & the wind also multiplies by scores as the bullets is in flight for a LONG time… However, at sub velocities the drag is completely different and the ballistic coefficient of a bullet is WAY less meaningful. It’s a different set of rules… Also, if your limiting factor is speed, but one can get a little more performance from increasing weight & why you see the 200+gr bullets shot in the BO.
I have played with a BO for about a year now, all at subsonic velocities in a bolt gun. My barrel is a 1-7 twist & capable of shooting about any 30 caliber bullet made. Still at sub velocities, your virtually creating a 30caliber 22LR. Once you understand that, you are good to go (expect to dope anything past ~60 yards or so).
After trajectory, the #1 thing in subsonic hunting is bullet performance. As stated earlier, all the normal 30caliber bullets are designed around centerfire velocities. They WILL NOT deform (open) at subsonic velocities. However, there are a few bullets out there that are designed to do so (Lehigh, Maker, Outlaw, Blackout bullets). These CAN change the entire performance of this cartridge.
I have shot game/vermin/opportunity targets with the 208 Amax, 220 Sierra RN, 200 Maker (sub designed), & 220 Outlaw (sub designed). Even squirrels will jump, flip, kick, run off a ways when shot with the 208 amax; unless way up front. I feel that the very pointy bullet acts more like a needle (think hypodermic) that expands the tissue & drills. The more blunt bullets do better at tearing or damaging the tissue and seem to put down small stuff better.
Out of these 4 bullets only one was “dramatic” on small stuff at sub velocities. The Outlaw bullet… It has a fluted jacket with GAPPING hollow-point and 4 small “tips” that expand very quickly. The 4” tips” separate and the copper jacket folds back. The remaining base & jacket stay together & in the media I’ve shot into retains ~80-85% of its weight. This bullet will tear starlings or tweedy birds in half & leave a 5+ foot streak of feathers (way different than the pellet gun looking wounds the 208 Amax leave on the same).
After playing with the BO & shooting some small stuff up to raccoon size, I decided to only run bullets designed to expand as sub velocities on anything living. (The other bullets still work great on paper).
The past year I also shot 5 deer with the 300BO (in the body, not head/neck shots). Four with the 200gr Maker bullet (solid copper designed very similar to the Lehigh pictured in this thread, but with only 3 pedals); and one with the Outlaw bullets. All 5 deer where shot from 50-109 yards. I realize this is a pretty small sample but a few take-a-ways:
-Broadside through the lungs, (perfect bow style shot) deer were found ~50-70 yards away with skimpy to modest bloodtrails (but good enough to follow easy enough through somewhat thick brush even with a flashlight).
-There was surprisingly significant trauma inside the ribcage on most. A couple was side bloodshot similar to a normal full power load.
-When deer were in group, they all deer scattered even though bullet hitting the animal was louder than the rifle report. (Just like shooting into a group with a bow)
-Shoulder shots, the bullet would deviate from straight line inside the deer (bounce around).
-Shoulder shots where shorter retrievals but less blood-trail. One was DRT from shoulder shot & that was with the Outlaw bullet.
We have a liberal hunting season in NC & I get to kill a lot of deer (and see a lot of deer killed). I will say that a typical hunting round (243, 260, 270, 7mag, 30/06 etc) is more effective at killing deer than running subsonics. Immensely, the flat line trajectory of those cartridges makes it even easier.
However, I found the 300BO sub’d to be plenty effective enough to take deer (WITH BULLETS DESIGNED FOR SUB VELOCITIES). In fact, I found it grades better killer than archery equipment. Not just the range but with expanding bullets, you get very similar lethality to broadheads, but with the addition of being able to shoot into the shoulder (a no-no for archery). And of course it’s well known that head & neck shots will result in a dead deer with any rifle also (something else you don’t want to do with a bow). The 300BO is no exception & with time spent; plenty accurate enough to do so.
This argument reminds me a lot of the “is 223Rem enough for deer” discussions. Those that “think” tend one way & those that have experience tend another. In either case… both are way more efficient weapons at taking deer than archery. Yet, you never hear the “ethical” question when it comes to the stick & string. But yeah I get the extreme range thing with the BO. It's REALLY pushing it...
If you’re wanting to kill deer, there is way better cartridges than the 300BO (especially in the subsonic performance). But if you want to try something different, or need to be extra quiet (hunting near homes or livestock) it can absolutely work. You just need to put a little time into it (beyond 50 yards) if you want anything back…