Building AR 10 243 looking for a good round

The math is pretty simple, you take a cartridge, like the 55gr V-max in .223 at.... let's use the mv achieved in a 16" ar, and it will give you a particular semi-repeatable terminal performance. That result, assuming all other things are equal will become more lethal by increasing the velocity, the diameter, or potentially the bullet mass. This increased lethality will give you a wider margin of error. If you could hit every coyote in the exact right place every time, we would all be shooting .17hmr, but you can't, or at least I can't. A .223 is perfectly adequate, assuming you hit them right where you should, within the margin of error for that round. If you increase the velocity or diameter, you're increasing the wound channel, penetration, or perhaps both, giving you the lethality you want with a less than perfect shot. For this reason, I shoot daytime coyotes with a 6arc, and I shoot them at night with a 6cm. Ive killed gobs of them with .223 and a dozen other cartridges, but for me, 6mm bullets in the 70gr-90gr range give me enough room for my own error that I can still have a dead coyote, even when the shot is less than perfect. Fur is worthless, especially in TN, so I don't care if it cuts them in half. I just want them to die where I shoot them..
 
Hecouldgoalltheway said:
The math is pretty simple, you take a cartridge, like the 55gr V-max in .223 at.... let's use the mv achieved in a 16" ar, and it will give you a particular semi-repeatable terminal performance. That result, assuming all other things are equal will become more lethal by increasing the velocity, the diameter, or potentially the bullet mass. This increased lethality will give you a wider margin of error. If you could hit every coyote in the exact right place every time, we would all be shooting .17hmr, but you can't, or at least I can't. A .223 is perfectly adequate, assuming you hit them right where you should, within the margin of error for that round. If you increase the velocity or diameter, you're increasing the wound channel, penetration, or perhaps both, giving you the lethality you want with a less than perfect shot. For this reason, I shoot daytime coyotes with a 6arc, and I shoot them at night with a 6cm. Ive killed gobs of them with .223 and a dozen other cartridges, but for me, 6mm bullets in the 70gr-90gr range give me enough room for my own error that I can still have a dead coyote, even when the shot is less than perfect. Fur is worthless, especially in TN, so I don't care if it cuts them in half. I just want them to die where I shoot them..
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Diamondcoyote1 said:
I'm not familiar with mpbr method? Could you explain alittle on that please?
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ShootersCalculator.com | Point Blank Range Calculator

Calculates the maximum point blank range of a firearm cartridge fired from a rifle or handgun.
shooterscalculator.com shooterscalculator.com

Link is a MPBR calculator. Plug in the ballistic data of your round and target size. It gives you a near zero, far zero, and maximum point blank range. For a 4 inch target, mpbr is the farthest you can shoot and the bullet never reaches 2 inches above or 2 inches below. I always zero at the near zero then use a ballistic calculator to see what it should be at 100 and zero to that. The round I shoot is zero at 34 yards and 1” high at 100.
 
I handload but I like my 85gr sierra bthp. I'm getting 3300 fps outa 20" pipe and it hammers um. 40lb female at 75yds didn't move. Bobcat at 109 wasn't tore up at all. Now if ya hit a fox in the head its a little different. Not sure if you can buy that load over the counter.
 
coyotekilla83 said:
I handload but I like my 85gr sierra bthp. I'm getting 3300 fps outa 20" pipe and it hammers um. 40lb female at 75yds didn't move. Bobcat at 109 wasn't tore up at all. Now if ya hit a fox in the head its a little different. Not sure if you can buy that load over the counter.
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. I'm looking to get into hand loading by next season I think. I will be trying to learn the process this summer. Currently I have 75gr vmax, 80 soft points and 90 grain edlx I think they are. Trying to see what gun likes the best. I'm actually back on my grendal atm till next season. Any tips on hand loading is appreciated. I've heard alot about the 85 gr sierra , alot of people like them
 
I have killed coyotes with cartridges from 17 HMR to 30-06. Now days I generally use a 223 AR15. I love the 22-250 and 243 but generally don't like the loudness of those cartridges. I have had runners with the 243 and smaller cartridges, probably because poor shot placement, LOL.

Basically IMO the 223 is adequate for most called coyotes at reasonable distance with proper shot placement and a good bullet. I would add, the 22-250 is prolly one of my favorite coyote cartridges. On a side note I killed a bunch with my old Sako 243, but now I am building an AR10 in 243, other than it weighing like a pig, I plan on getting a few with it and the 75 vmax.
 
Coyotejunki said:
I have killed coyotes with cartridges from 17 HMR to 30-06. Now days I generally use a 223 AR15. I love the 22-250 and 243 but generally don't like the loudness of those cartridges. I have had runners with the 243 and smaller cartridges, probably because poor shot placement, LOL.

Basically IMO the 223 is adequate for most called coyotes at reasonable distance with proper shot placement and a good bullet. I would add, the 22-250 is prolly one of my favorite coyote cartridges. On a side note I killed a bunch with my old Sako 243, but now I am building an AR10 in 243, other than it weighing like a pig, I plan on getting a few with it and the 75 vmax.
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Actually my ar 10 243 with 22" barrel doesn't weigh near what I thought it would. It's about the same as one of my 15's. Was very surprised and I also have the 75 grain that I'm trying
 
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