First, I have not seen enough kills with the ARC to know if it is as effective as its larger brother on deer and hog sized game. I've seen hundreds of kills with the Grendel in gas gun. But for Coyotes, they are both more than capable.
I would post some tables of the ballistic data between the ARC and the Grendel but they would take up quite a bit of space. I have run the numbers over and over between the 2 in equal barrel lengths at gas gun pressures. At hunting distances or to let's say 600 yards, the differences between comparable bullets 103 vs 123 and even the 108 are insignificant. At 1000 yards the ARC 108 does have a slight edge. 25" less drop, 7" less wind drift, and .08 second difference in flight time. But has 40 ft/lbs less energy. So you may perceive a difference on really long range varmints but there are better options in 6mm and 6.5 if that is the goal. Either will do a lot of damage to a Coyote pretty much as far as you would care to shoot one.
Recoil difference is very slight but the ARC does have less.
The biggest difference in the 2 would be the Hornady Red Koolaid. If I had 1 of these calibers, I would not trade it for the other. Which I do. I have 2 Grendel's as they are my main deer and hog depredation guns. Right now there are more factory ammo options for the Grendel. The ARC may or may not see that in the future.
For a bolt gun there may be some advantages. I don't know as I will never go that route. But if I were going for Coyote at really long range with a bolt gun, I would likely go for one of the 6mm options used in BR competition.
I would post some tables of the ballistic data between the ARC and the Grendel but they would take up quite a bit of space. I have run the numbers over and over between the 2 in equal barrel lengths at gas gun pressures. At hunting distances or to let's say 600 yards, the differences between comparable bullets 103 vs 123 and even the 108 are insignificant. At 1000 yards the ARC 108 does have a slight edge. 25" less drop, 7" less wind drift, and .08 second difference in flight time. But has 40 ft/lbs less energy. So you may perceive a difference on really long range varmints but there are better options in 6mm and 6.5 if that is the goal. Either will do a lot of damage to a Coyote pretty much as far as you would care to shoot one.
Recoil difference is very slight but the ARC does have less.
The biggest difference in the 2 would be the Hornady Red Koolaid. If I had 1 of these calibers, I would not trade it for the other. Which I do. I have 2 Grendel's as they are my main deer and hog depredation guns. Right now there are more factory ammo options for the Grendel. The ARC may or may not see that in the future.
For a bolt gun there may be some advantages. I don't know as I will never go that route. But if I were going for Coyote at really long range with a bolt gun, I would likely go for one of the 6mm options used in BR competition.
