I think your asking alot of the little 223 with a 50 gr bullet at 300 yards. With only 3280 fps at the muzzle, that little Rem bullet will drop velocity pretty quick and at 300 yards your energies will be pretty low.
Now I am not saying the 223 is not a 300 yard round. It certainly is and obviously it is accurate and deadly in your rifle at 300 yards. I think we just need to keep in mind what we are asking the little round to do.
Energy does not mean a thing as far as killing power but it does have alot to do with varmint bullet expansion. The higher the energy the more rapidly the bullet will expand which from your post is what you are looking for.
The only way to get more expansion with a given velocity and energy level is to use a thinner jacketed bullet. As mentioned the Calhoons are great bullets for expanding and I personally fine them best suited for rounds up to the 223 class.
I woudl recommend the 52 gr Double Hollow Point RBBT. Non of the Calhoon bullets have what I would call a high B.C. as Jim designs his bullets for use out to 400 yards and that is about it.
They do expand very violently and are generally very well priced.
In testing several bullets for my 223 rifles I have settled on the 50 gr Blitzking from Sierra. I tried the B. Tips which I am a huge fan of and the V-Max bullets and of the three the Blitzking provided the most violent expansion of the three in the 50 gr class. They also tied with the B. Tips for best accuracy as well. The thin cup jacket on the Blitzking seems to totally come apart as aposed to the B. Tip with its heavy solid base that generally did not.
Plus the Blitzkings are significantly cheaper then the B. Tips.
Another great bullet for the 223 is the 50 gr Speer TNT. This bullet is really made for the 223 class rounds and performs as such and is generally very accuate and even lower priced.
All in all, keep in mind that no matter what bullet you load in it, at 300 yards, your still shooting a 223. If you want those massive explosive impacts you will probably need to jump up to a 22-250 class round at least on targets the size of Jack Rabbits.
Allen Precision Shooting
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Kirby to be honest with you that is the most I have shot my 223 in the last 6 months. [img]/ubbthreads/images/graemlins/smile.gif[/img] I mostly use my 220 Swift or 7mm STW or 300 Win and most of the time I pack to rifles one for short stuff and one for long. But after changing scopes and running out of powder that was the only rifle in the closet ready to go last night. [img]/ubbthreads/images/graemlins/smile.gif[/img] I know its just a little 223 but I would have thought the closer shots would have been a little better but oh well. I could crank the FPS and see what happends but at 100 yards those Rem HP's shoot 3 shots in the .1's and that is out of a stock Rem 700 BDL non Heavy barrel no less. I will say it is fun shooting those little cals and watching the bullet hit the target. I do plan I trying to take rabbits, gophers and crows out to 500 yards once I find a good expanding bullet. Does anyone think that is to far for a 223?
I use 50nbt's and 50 blitz kings in the 22-250 at 3800fps. both work well.
In my 222 I couldn't get explosive results with either so I limited my distance and shoot the 40 V-Max at 3600fps, they do the trick.
Rimfire you like the 40gr V-Max? I have a good load worked up for them in this rifle and it is driving them at 3682FPS. I have not shot anything but paper with them but I should give them a try. I would think they would be good out to the 300 yard mark on rabbits anyway. I went with the 50gr because I figured the heavier bullet at longer distance would be better. I guess I will have to do a little more bullet testing. I just hate doing that. [img]/ubbthreads/images/graemlins/grin.gif[/img]
I would think the 50 or 52's would work better for long range, but the speed trade off worked for me out to 350.
At 100-150ish they dont exit a fat hog. The guys at the woodchuck den in Ohio gave me the load (40 V-Max seated hard over a stiff load of H-4198) [img]/ubbthreads/images/graemlins/grin.gif[/img] Load testing took all of two minutes to work near max and there it was. The gun is a new in box 1966 Sako Vixen that was found in storage. .5 MOA out of a 66 is good enough for me.