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I love the 221 Fireball above all other rounds I own for accuracy and quiet, no recoil performance.
But mostly I like dead coyotes. If the 221 Fireball had proven as effective of a coyote killer as some of the other rounds I shoot, I'd always use it.
Its not, so I don't.
223 and FB for comparison. Where the 223 really out-muscles the 221 is when the heavy more effective bullets are used. Plus all Fireballs have a slow twist rate. I beleive most are 1 in 14. Made for shooting 40 grainers.
Well Amigo,
Not to flame you but, although you've used the .221 Fireball, (and yes the .223 does have more poop than the Fireball) and regarding your photo and the reference to size difference, there's not a vast enough amount of velocity difference to make it "not worth" using, or really a "less efficient" coyote dropper.
Oh yes, and most rates of twist regarding the .22 centerfires, were and have been based greatly on 1 in 14", and 1 in 12".
The 1 in 14" twist will stabilize anything from 35gr to 55 gr bullets very well. The 1 in 12" rate of twist will allow a little heavier bullets, maybe 60grs. or so.
Go over that and you have to drop into the 1 in 10, 9 or 8 inch rates.
Regarding the case size differences;
I'm using a case in a custom .22 Super Jet that has a 9% less case capacity than the .221 Fireball. It's based on the Remington Jet blown out to fit the Super Jet chamber. More or less, a .256 Win Mag necked down to .22 caliber. Hodgdon's powder data for the maximum listed load of 16.0grs. of Li'l Gun using a 40gr Vmax is 3384fps. in the Fireball.
Using the same powder and bullet in a maximum load in my Super Jet is 15.3grs. at 3520 fps.
The case is smaller, so how can that be ?
Case design, shoulder angle and all, have a lot to do with it. It's more efficient with less powder.
Here's a link to a photo of the comparison of a .22-250, .223 and the .22 Super Jet.
Handloads.com
It's much smaller than the .223, but comparing maximum loads, it equals, or (in some cases) surpasses the .221 Fireball, and the .222, and only lacks a couple of hundred feet per second on the hottest .223 loads with the same bullet weight. And it does it all on half the powder charge of the .223.
I'm using the most accurate loads in the Super Jet, which are less than max., at 3393fps. Equal in velocity to the Fireball's (Hodgdon's) listed maximum's at those speeds, it kills very quickly on my field tests with it. I would have to say that it kills every bit as quick as the .223. Maybe even the .22-250 in some cases, if you discount the excessive carnage that the .250 can produce.
Shot placement is key, over most cartridge considerations, other than the most ridiculous choices.
And, yes the .243 has it's place as well, but it's far from the "lighting strike" coyote killer that you make it sound.
My calling partner carries one on many of our hunts, and although it's mostly a good long range gun, in close, the bullet is still travelling fast enough where it's "time in target" doesn't provide enough for the bullet to perform with most brands.
I visually witnessed two kills in recent years, one on a coyote at 125yds., and another on a fox at 300yds. + or -.
The coyote was hit behind the shoulder at a slight quartering angle, and the bullet exited behind the offside last rib. The round past cleanly through the animal and sucked a good sized wad of the coyote's innards out the exit wound.
That coyote ran another good 150yds, before piling up, and thank god it was on a foggy plowed field, because had it not been, we might not have found it for sometime.
The fox was skewered diagonally from centered chest entrance, to flank exit, and it ran off to pile up under a tree and still needed a swift clubbing before dying.
What I'm trying to get at here, is that it isn't necessarily the more powerful round that is the most efficient killer. It has more to do with bullet construction, and the proper velocity for it to function as intended. Choosing a bullet that will fragment inside the animal at normally encountered ranges, more or less, is the optimum to strive for. Too short with just about any caliber and the bullet can exit and make a mess, too long and it'll still stay inside. Depending on the rounds you use, you can choose them to overlap somewhat regarding effective ranges, which is what I do.
My .22-250, even with fragible VMax's, will blow through most anything inside 100yds. Get beyond 150yds, and closer to 200, and it rarely exits anything. I shot a chuck in the head at 223yds. with it and although it made mush out of the head, it still stayed in there.
I smacked a coyote with it at 210yds. broadside and it dropped DRT after a very short spin.
I hunt in pretty much the same geography as you do, okay I have a little more open area's, you have a little more woods, but it's very similar and the coyotes in both area's are good size.
I've personally seen two large males at 62 and 67 lbs. taken, but our averages are around low to mid 50's maybe.
I built that short barrelled Super Jet for close woods and distances out to 200yds. or so, and I've hunted the same close woods with handguns which carry even less energy, but drop them pretty decently.
Oh well......
Kind of like the old saying, "It's not the size of the gun, it's the powder behind the bullet".
Take care,
Bob