best weight for 1-7 or 1-9

[smoking_guns10@yahoo.com]

one in seven twist 223 with 20 chrome lined colt hbar
whats the lightest recommended and heaviest weight bullet?

 

[1KBR]

Depending on the length of the throat, you could use a 100gn Wildcat projectile, but most likely a 90gn Berger or Sierra would suit the throat length and still stabilize in 7" twist.
If you start pushing 50gn projectiles very fast, the rotational speed could cause the bullets to come apart. I have used 60gn bullets in 7" twist and they went well.

 

[jbpmidas]

I had a 16" 7-twist and it shot 69 NCC's very well and they are relativley cheap, or were at least. I shot some in the 60 and 62 weights and did not get results like the 69's, but I did not spend much time developing them.

 

[Taildrag15X]

Your best bet for the heavy end would be the 82gr. Berger, I used 69's, 75's, 77's, and 80's most of the time, don't think that you'll have enough throat for the 90gr Berger as my Colt didn't.

I never used anything less than 69gr bullets out of the Colt, but with a bolt gun in 1-7" 55gr. bullets works well when the speed is keep in check.

 

[people]

I shoot lots of 50gr bullets from a 1:8 twist tube. One of the guys I shoot with has a 1:6.5 twist and he shoots lots of 40gr bullets for 100yd practice. You will be safe shooting the 77 to 80gr bulets out of your 1:7. You might have hit and miss with anything above that. The barrel manufactures state that they can shoot up to 90 but that depends on your barrel and actual twist rate.

 

[KevinThomas]

Real question here is, what do you want to do with it? As for the twist, you'll be able to shoot anything from 40 grain bullets on the light end, all the way up to 82s or so on the heavy end, so long as you're single loading them. Forget the 90s. They need a 1x6.5" to be sure, and are marginal with a 1x7". They also need a longer barrel than the standard 20" to reliably get decent results, say a 24" or 26" as you'd find on most Match rifles.

With a chromed bore, I'm assuming you're not using this as a competition rifle, so the question remains, what did you want to use it for?

 

[markm87]

With a chromed bore, I'm assuming you're not using this as a competition rifle, so the question remains, what did you want to use it for?

This is it....

That said, we load bulk ammo with 69gr SMKs that runs amazingly accurate in our Chrome lined barrels. We'll shoot them out to 700 yards with Short barreled AR15s... after that they seem to suffer from transonic squirelliness.

 

[smoking_guns10@yahoo.com]

mainly want it to eliminate coyotes,armadillos and other pest, just a fun toy to enjoy
thats why wanted the lightest and heaviest

loaded 223 before but not for a 1:7

 

[ar15topgun]

mag length ammo stops with the 77gr. bullets. single load up to including 82gr. bullets

 

[Laurie]

mag length ammo stops with the 77gr. bullets. single load up to including 82gr. bullets

Yes, if you're looking to use the magazine which I assume you will for pest shooting, the 77s are a very good choice and are competitively priced. 69gn match bullets and the 73gn Berger do really well at mag length too in this twist.

Some Hornady bullets seem a little fragile when used in fast-twist barrels. I had both 75gn HPBT and 52gn A-Max bullets come apart on me from a 1-8" twist Lilja when fouling built up and if temperatures were very high. Before they started exploding (around 90yd from the muzzle), elevations would go to pot first as the barrel fouled / heated. Most 55gn and heavier varmint bullets will still work fine from a 1-7" despite their being theoretically spun too fast. I'd buy one box at a time when testing though just in case and bear in mind that barrel and weather conditions affect bullet integrity, so a marginally overstressed bullet might work great on one outing and see every second bullet fail next time out.

 

[smoking_guns10@yahoo.com]

so are you guys saying 60 and up to 70's for this ar?

 

[people]

With mag length ammo you can go up to 77gr. You can go as light as you want but you may have bullets come apart once your throat starts getting wore.

 

[smoking_guns10@yahoo.com]

I have 3 boxes 35 grain vmax, if I load them light would they do ok?

 

[Shynloco]

Smokin,
Let the rifle tell you what it likes or dislikes. Sure there are general guidelines for barrel twist to bullet weight ratio. But the barrel of a rifle will make the final judgement because each rifle is unique. I've run into that issue several times not only with comparing the same caliber rifle made by the same manufacturer, but even with the same caliber with different manufactured rifles. Too many variables. Gotta test to find the best load for YOUR PARTICULAR RIFLE. Just because it works in one doesn't necessarily mean it'll work as well in another. I usually load three to five groups of five and hit the range. Even different manufacturer bullets of the same weight will produce different results in a given rifle. Gotta test to find out.

 

[Hombre0321]

Great advice "Let the rifle tell you" it will never work with you telling the rifle which bullet or powder or primer. No preconceived ideas on your part.

Also remember it's not the weight of the bullet, it's the "LENGTH" of the bullet. Granted they go somewhat hand and hand, and longer bullets weigh more, But the twist rate could care less about stabilizing the weight of the bullet. It does however stabilize the length.....

Roland