Which caliber for general woods use and wildlife protection

I would not use anything that fits in the AR-15 if you have bear protection in mind unless you're willing to go with a .50 Beowulf, 458 Socom, or 450 Bushmaster and even with those there are better cartridges for protecting your life from an angry bear. Those are all also expensive to shoot and harder on the shoulder if you plan to play with it doing target practice.
The 6.5 Grendel is no where near powerful enough for bears and I wouldn't even hunt a deer with it past 200 yards. If you look at the velocity it's making with the heavier projectiles it's pretty slow which will mean poor penetration and poor expansion on large game. It's got a very efficient projectile making it great for target shooting, varmints, and predator hunting but I wouldn't choose it for anything larger than a wolf.
If you really want a black rifle that will do exactly what you are looking for then you want an AR-10 pattern rifle in any available chambering, I would even choose a .243 win over the 6.5 Grendel for actually shooting animals. Skip the BCl 102 though as they are so hit and miss on if you get a reliable one. A Modern Hunter can be reliable but even though mine has been performing great with the 6.5 Creedmoor I don't know that I would trust it for bear protection.

I gave up on hunting and carrying a black rifle for anything practical, I don't hunt with them anymore and I don't try to carry them in the bush much unless I have my quad. Why would you other than because you can. Even the lightest build still weighs more than my Rem 700 in 7-08, the bolt action is more reliable and more accurate for less money. I own quite a few black rifles and love shooting them but they are toys for me, real work gets done with the right tool for the job.

My ultimate hiking rifle and bear protection rifle was my Marlin 45-70, you could load it with lighter projectiles at moderate velocities for plinking and target practice without having a sore shoulder and you could load up 400+ grain projectiles that will smash through bone and thick hides to get the job done. The lever action is light weight, reliable, accurate enough, and has the knock down power needed when you might only have time for one shot. Remember that if you say bear protection you aren't shooting at a grazing bear 100 yards away, it's going to be at 20-30 yards and closing fast.
If you go with a semi auto black rifle in an AR-15 based rifle you're relying on magazine capacity rather than correct cartridge choice for the task at hand.

There really isn't a one rifle for all occasions rifle if you want it black and scary looking. If I was going to go with an AR-15 based platform I'd probably stay with a 223, cheap to shoot, will kill anything smaller than a deer, good for target practice, and if you end up face to face with a bear at least you have 10 round pistol mags and the 223 makes a lot of noise along with having the velocity to penetrate if you use a decent bullet.
It's always a compromise if you want a semi auto black rifle, you also have to make sure you spend enough time with the rifle to know it's reliable and that you're practiced enough with it to be able to get shots off in a hurry under pressure.
 
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Foster slugs won't penetrate properly, Federal DP's or Brenneke's will. I know a guy who killed a Grizz with a 375 H&H - it nearly killed him when it ran him over. According to the folks who carted him out of the bush, his shot was nearly instantly lethal, it took the better part of six months for him to get back to work. Not a chance I'd want to take.

The DP and Brenneke slugs are a big improvement in that the lead is much harder than typical foster slugs so it won't pancake when it hits bone. But the sectional density is still only .118 for a 12 ga 1oz slug. Compared to .348 for a 500gr .458 bullet, .301 for a 200gr .308 bullet, and .305 for a 286gr 9.3mm bullet. If you need penetration, SD of .300 or higher will do you well.
 
In a non-restricted AR style rifle I would not hesitate to go 450 Bushmaster or 458 SOCOM but I also already load 45 Colt/454 Casull and 45-70 so I have appropriate bullets to load for protection on the shelf.

I recently purchased a 16" barreled Ruger American in 450 Bushmaster it betters my 454 Casull loads in my 20" barreled LSI Puma M92 lever rifle by an average of 80 - 100fps loading the exact same bullets and I haven't worked up the loads for the 450 BM yet.

This 450 Bushmaster loaded with appropriate bullets is a thumper round that I would not hesitate to use as a defense combo against big bears.

When you take into consideration a Marlin 1895GS in 45-70 loaded with 525gr bullets @ 1600fps or 550gr @ 1550fps is considered one of the better bear stoppers and then compare to the 355gr @ 1840fps or a 395gr @ 1750fps there is nothing in North American this combo can't stop.

With that said for ease of finding reloading components - factory ammo get your hands on a shorter 20" - 22" barreled bolt action in 30-06.

Ruger American 450 Bushmaster review of loads and rifle
Was able to put some loads with 225gr - 240gr - 300gr - 355gr bullets with AA#9, Lilgun and AA1680 powder together and get out and shoot them today was raining when I headed out with my dogs but it started to clear up when I headed up into the mountains.

I recently purchased a 16" barreled Ruger American in 450 Bushmaster installed a Leupold VX2 2-7x33mm long range reticle scope with Leupold PRW rings.

I wasn't shooting for accuracy more to check velocities but I have to say I am very happy with the grouping I was getting with the different loads and bullet weights I used Win small rifle primers.

I set up my LabRadar doppler radar unit to read ranges at muzzle - 25 yards and 50 yards I set up my target @ 60 yards .

225gr Hornady FTX with 41grs Lilgun
2453 2303 2160fps
2451 2301 2160fps
2441 2293 2151fps

I put together a reduced recoil load for my wife to shoot

225gr Hornady FTX with 34grs AA#9
2123 1984 1857fps
2029 1894 1770fps
2090 1955 1827fps

240gr XTP-Mag 40grs Lilgun
2396 2224 2064fps
2462 2283 2123fps
2373 2203 2051fps

300gr XTP-Mag 41grs AA1680 I really don;t know what to say about this load....
1670 1580 1504fps
1745 1649 1561fps
2295 2130 1995fps wow what happened?
1789 1689 1605fps

355gr WLNGC's 31grs Lilgun
1852 1738 1638fps
1844 1740 1648fps
1827 1723 1626fps

I still have 395gr WLNGC's, 405gr WLNGC's and 535gr Ranger Rick WLNGC's to work up loads for this rifle/cartridge combo just need to decide on starting loads for each before I attempt it.

454 Casull


These are not top Freedom Arms 454 Casull loads these loads were designed for my 6 shot 4.25" barreled Ruger Super Redhawk.

Ruger made the 454 Casull SRH cylinders with a super tough but slightly stretchy metal it can handle the top FA loads but with the cylinder stretching when fired it would lock my fired brass in the cylinder so my loads were worked up until the cases had slight extraction issues I then backed off my load 1/2 gr.

20” LSI Puma M92 454 Casull Data...

240gr XTP-Mag 38grs H110 1) 2258 2) 2327 3) 2316

300gr XTP-Mag 30grs H110 1) 1858 2) 1821

300gr Speer Gold Dot 31grs H110 1) 1890 2) 1897

360gr C/P WLNGC’s 27grs Lil-gun 1) 1848 2) 1846 3) 1828

395gr C/P WLNGC’s 24grs Lil-Gun 1) 1647 2) 1642 3) 1650


Comparing this data with my 450BM data I now see a starting load for my 405gr WFNGC's I wanted to try AA1680 though but will stick to Lilgun for now.
 
7.62x39 is the caliber you are looking for based on your requirements. I would buy a cheap 12g for wilderness protection. If you can afford a NR ar type rifle you can afford a shotgun.
 
Actually I think a nice old jm marlin 336 in 30-30 will be perfect for your use, if you don't care too much about the semi auto and 10rd mag part.
It's lighter than most semi auto, capable of shooting 1-1.5 moa with scope, and the caliber will work for both predator control and (black) bear defense.
 
Good old .303 British soft points in a handy dandy No. 5 jungle carbine. It will put down anything in the woods that might harm you.

I believe the op was looking for an ar-ish platform.
So a 100 year old bolt action would not be my choice..imho
OP said bush gun, in my area that means a heavy bullet that doesn't defect thru willows or twigs.
It also means most "surprise encounters " happen at close range, so the 450 bushy is my choice.
Yes there are larger calibers, as to the OP, is conserned with recoil.
The 250 grain "stretched 45acp" will produce recoil, but less,200yrd.+ capabilities.
Draw back is you wanna reload..or buy and hoard your round.
Another upper in 22lr, 9mm ,223 would allow use of platform much cheaper if that's your thing...
 
I was called up to a friends cattle ranch to dispatch a 1400- 1500lbs cow that had broken her lower left front leg for them.

Didn't hesitate I took my Ruger American 450 Bushmaster I loaded it with my 355gr WFNGC @ 1850fps loads.

Cow wouldn't let us closer then 40 yards from her I put the 355gr bullet 1" high above center of her eyes she hit the ground harder than I could imagine.

Later on that trip I tried my 250gr FTX loads @ 2300fps + my first dot down on my Leupold 2-7x33mm LR reticle scope is dead on at 250 yards.

If I had an interest in an AR platform I would have uppers in 6.8spc and 450 Bushmaster.
 
I had the same idea about 5 months ago. ATR is on it. You'll need to build two uppers. Only way meet your criteria i.e. one in either .223, 7.65x39, 6.8 SPC or my personal choice would be the 6.5 Grendal. A upper in .223 for plinking is obviously the best lower cost choice and for small game it will work well with the right bullet. Add a .45 cal upper for bears. Already stated that a .45 cal AR5ish rifle is not a great choice for bears. Especially Grizz...but really a .375 HH type power rifle is the only medicine for those scary beasts, so forget about taking one of them on with any AR. Have you considered a light weight version in the AR10ish family of rifles? You can get a well/light weight built Stag 10 down to under 9 lbs with the right optics. Probably only giving up a lb or so to the AR15ish family of unrestricted rifles. A light weight pencil barreled Stag10 and a good muzzle brake might be suitable for your kids and wife. Irunguns sells them for about $2,100 taxes and shipping all in. It took alot of training but my 13 yr and 11yr old daughters have no issue unloading a full mag while taking off hand shoots into a 12 x 16" metal plate at 100 m using the sling supported method on my Stag10. Its a pencil barreled Stag 10 with a Lantac Dragon Brake...weighs in a 10.4 lbs with Vortex 2-10x32 Viper optic, BUIS, three MDI rails, sling and a 5 rnd mag.
 
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I've got it, you need to buy my 12ga
Looks like an AR, has massive stopping power, and you can run cheap shells in it for fun time and heavy duty stuff for bear country.

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