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Most practical AR round to supress that's not niche, or limp-dick.

EotS

Sergeant of the Hide
Full Member
Minuteman
Nov 12, 2020
462
412
South
I'm wanting a canned AR because.

Actually, something cool for night stuff. Varmint and predator control. Say, 250yds and under.
What's the ideal round and bbl length without getting too deep in the weeds? I have a number of 556 guns, and a 16in 300bo upper that I honestly don't remember the origin. Build up the 300, use one of the 556s or something else?
 
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350 legend. We've loaded all kinds of 9mm (355) and resized 385 pistol bullets. It smacks the hell out of deer and drops them better than the 45-70 shooters I hunt with. Not much correction needed to 200 yards. The primary arms 7 62x39/300aacbalistic drop ive shot to 400yd with 150g loads accuratly. It's also got some nice suppressed rounds out.

I'm a 350 fan boy
 
6.5 Grendel is a safe bet. I haven’t ran across a 6.5 Grendel barrel that wouldn’t shoot one of the Hornady offerings 1.5moa or under.

14.99 per box AAC ammo has worked well this year killing pigs and up to 200lb white tails. It shoots pretty good 100 yard groups in 2 of our guns but sd’s are too high to consider it for any long range shooting.

6mm ARC would be my second choice.

Both are fun to shoot and easy to maintain sight picture for fast follow ups with a thermal. Both are point and shoot flat out to 200 yards. Both kill critters better than 556. Both suppress well using 308 cans.

I’ve got 5 Grendels and have 2 6mm ARCs. Both rounds get everything you can get out of the small frame platform.
 
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Depends entirely on what you mean by "predator control" if it's just coyotes, then get something very flat shooting with high energy like 22Arc, if you're meaning anything up to and including bears, you're going to need something more substantial.

basically you have not provided enough information about the use of the tool to get a good analysis of your needs. it's like walking into a hardware store and saying "what's the best power tool for wood"