How so? Did you think 1/8 should not shoot it?
223 bullet stability chart w BC and bullet lengths
- Thread starter BobbyJ
- Start date
No it was on the light green on your margin chart, I thought it might stabilize better.
Well its barely over 2 that is the cut off for being over spun. So its perfectly stablilized in 1/8. The range for being over is from 2.01 to 3.59. So its on the good end of that. Green and light green are both good.
Done!
Its up.
223 Remington is specified as 1 in 12 per SAAMI. The only 223/556 with 1 in 14 was an early version of the M16 sent to Viet Nam for evaluation. That twist gave the 55 gr. bullet devastating terminal ballistics but also meant that striking a leaf would destroy the bullets trajectory. The twist of the M16 was quickly changed to 1 in 12.
Acyr
Gold $$ Contributor
Misprint on 85.5 Hybrid (you wrote 80.5 Hybrid)
I have no idea what the average factory gun twist rate is. For ARs its probably 1/8 and 1/7 for bolts not sure many went to 1/9. Is 1/14 the factory default in 2022? Not checked.
Thanks!
Most bolt guns are 1 in 8 or 1 in 9 now but some varmint types still come with 1 in 12. The proliferation of longer heavier bullets for the Semi Autos and newer 224 cartridges has lead to the change.
That's an interesting study. I shoot a small 40 grain so fast out of a 223 using a 1 in 12. I certainly wouldn't want anything faster then a 1 in 10.
Glad to read that most guns are not 14:1 now. For a time window of my checking they were.
A Colt AR-15 I had back in the early 80s was 12:1. That works for this little cartridge.
But my son's cooper came in 14:1 ~15yrs ago, which I knew eliminated most 22cal bullets..
Shooting here at sea level, I had to go with custom 40gr BR bullets for the Cooper.
I didn't realize anyone actually put out a 1 in 14 223. I have to think this was a varmint rifle with the intent to use the same bullets used by the 22-250. 50 gr and less.
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