Are 52gr bullets too light for a 1in7 barreled AR

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Feel kind of dumb asking this, but I'm just not in a mood to do a google dive and frankly prefer asking/looking for info where i can have feedback, so.

Getting ready to start reloading for my Wife's AR, which happens to have a 1in7 twist barrel.
I thought I had a box or two of 55gr or a partial box of 69gr smks in the stash...

But the heaviest .224 pills i have are some Sierra 52gr ones that i can't remember offhand if they're the flat base "varminter" profile or the boattailed "matchkings".

I have fired exactly 35 rounds of ammo through this barrel that were not surplus 62gr "M855 equivalent", those 35 were all 52gr of the same type as found in the bullet stash, and made a shotgun like pattern on a USPSA target at 100 yards. BUT! those were all 20+ year old handloads for a long traded away savage.
so i can't be sure if it was a case of too light a bullet or just not an appropriate load overall for the gun.

so what say you, is it worth trying the 52s in a 1in7 barrel or do I HAVE to look for some 55s or 60s minimum?
 
Load a few and try them.
I have shot some 36gr and had no problem hitting man size targets at self defense ranges.

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Keep the velocity down. Light charges of H4198 are what I use in my AR pistol.
 
While I have no firsthand experience, I recall reading that some people have had issues with 55gr in 1/7 but that it has more to do with the bullet’s OAL than the weight. A 52gr HP is probably the same length as a 55gr FMJ.
 
I shoot a Sierra 52gr HPBT though my NRA/CMP service rifle (1-7 twist) for 100yd reduced course highpower matches and have no issues. My recipe is 24.6gr WC844, CCI 400 primer, 2.25" OAL

No idea of the velocity, but the ammo shoots well through my rifle. Using this load I managed to pull off this "clean" target on an MR31 during a match a couple months ago. 20 shots prone, 3/4" x-ring.

upload_2020-6-16_8-4-19.png

Here's some load data from Sierra

upload_2020-6-16_8-12-15.png
 
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