Question on barrel twist rate - 8 vs 12.

[duncan61]

If you end up with the 1;12 twist it would be good to see how 69gn target bullets go

[bladeracer]

If you end up with the 1;12 twist it would be good to see how 69gn target bullets go

They won't. 55gn is about as long a bullet as you can run at 12" twist. 69's will have no chance of stability at all.

[Ikkarus]

Yeah my mate picked up a bunch of the 69gr Aussie Outback which shoot great out of his RPR. Not gonna go anything above 55 if I end up with the 1:12" due to the stabilisation. Sadly, cannot find the 55gr Aussie Outbacks anywhere but have already grabbed some Buffalo River (same manufacturer I believe?), some Winchester and some Tikka rounds for initial testing.

[duncan61]

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.22 Caliber (.224) 69 gr. HPBT MatchKing (100 bullets)
.22 CALIBER (.224) 69 GR. HPBT MATCHKING
Sierra MatchKing BulletsDesigned for Service Rifle competition in the M16A2/AR-15A2, our 22 caliber bullets have set an incredible number of new national records.

While they are recognized around the world for record-setting accuracy, MatchKing® and Tipped MatchKing® bullets are not recommended for most hunting applications. Although MatchKing® and Tipped MatchKing® bullets are commonly used for varmint hunting, their design will not provide the same reliable explosive expansion at equivalent velocities in varmints compared to their lightly jacketed Hornet, Blitz or Varminter counterparts.

The #1380 was introduced in 1984.

This bullet requires a barrel twist rate of 1x10” or faster.

Dia. (inches) Weight (grains) Sectional Density Ballistic Coefficients and Velocity Ranges
0.224 69 .196 .301 @ 2800 fps and above
.305 between 2800 and 2200 fps
.317 @ 2200 fps and below

Price: $27.36 Stock Code: 1380
100 bullets
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Les S of Darwin , Australia January 10, 2017
10 shots 10 kills on big roos , they fragment to cause max tissue damage ,the base holds together still 30gn ,and gets penetration
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Blake S of Spanish Fork, Utah December 18, 2016
I started using these in my 22-250 behind some varget powder and .... wow!! They shoot better than I could have asked for. Get ya some , you won't be disappointed.
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robert w of myerstown, Pennsylvania August 12, 2016
most consistently accurate bullet I have used in my savage 12fv rifle. 3/8" to 1/2" groups at 100-150 yds.are the norm. have used sierra bullets for over 40 years. others are good but sierra are my choice. take the time to work up your load, may take some effort, but when you get it, all at the range notice!
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john p of towanda, Pennsylvania December 6, 2015
this is the only bulet i will use in my 223 f class rifle...constantlly small groups to 500 yards..tried bergers,but the sierra 69g.

[duncan61]

your right

[yoshie]

Some people can get 62g flat bases to stabilise but their loads are usually over max and even then some rifles dont stabilise them well.

[Member-Deleted]

Well Ikkarus my son and i have been through what you are about to go through ,firstly couldn't wait for rifle, then it turned up, novelty wore off
so decided to try heavier projectiles then the wish we had got the 8'' kicked in, by the way the rifle was also 223
Mate sounds as though these blokes know what they're talking about in fact i would put money on it, myself i only shoot ferals and hunt i'm not a member of a
shooting club
In my experience with shooting 400 to 500 yrd with 55gr the weather would have to be nigh on perfect infact i wouldn't even try to shoot anything at that distance
with a 223 ( unless targets) i run a 22-250 and with 55gr it to is iffy at long range even with the slightest breeze hence i now shoot 25-06 for the long breezy shot
had to get better weight
Since buying the 223 my son has done some work on it and rebarrelled to 8'' and hasn't looked back his mate borrows it to shoot at his club

Mate i to have learnt nothing from listening to gun shop owners i have had my own bad experience with them but i won't go into that now
You've got some good advice from these blokes i would run with it and get the 8''the shop can change the order easily don't let them talk you out of it
Just my opinion

Cheers

[duncan61]

Unfortunately gun shop staff do get it wrong.I had a staff member telling me that shot gun target ammo would not hurt parrots but it made no sense so I went with it and the cheap target ammo worked great on rabbits and parrots

[Ikkarus]

Just got off the phone to the GS now and they were happy to swap it for a 1in8 twist. 2 more weeks waiting but I think I'll be happier with it in the long run. Thanks again all for your help and advice!

[Gwion]

Good stuff. Two weeks waiting well spent.

[in2anity]

Just got off the phone to the GS now and they were happy to swap it for a 1in8 twist. 2 more weeks waiting but I think I'll be happier with it in the long run. Thanks again all for your help and advice!

smart move

[Wm.Traynor]

Knew a bloke who said that "light bullets" shot well/accurately in his 1:7" 223. It had a long, heavy barrel and I don't know if that would make a difference but good luck with your new toy mate

[Gwion]

The only real issue in shooting small bullets from a fast twist barrel is that if lightly constructed and pushed fast enough, the centrifugal force imparted may, that's MAY, cause the bullet to come to pieces in flight. For instance, I have some 40gn bullets that the manufacturer warns against pushing faster than 3400fps due to their highly frangible design & construction.

[duncan61]

Great result

[Member-Deleted]

There you go Ikkarus well done i hope the rifle is what your after and hope you enjoy it
Its marvellous how a little bit of know how from people in the know can help
The two weeks longer nothing because you most probably would have regretted it for much longer than that if you had gone ahead
with the original 12'' twist

Best of luck

[Ikkarus]

Thanks guys, I really appreciate the help and I'm glad I decided to ask here. You all seem like an awesome and knowledgable bunch.

[duncan61]

Are you going to try 77gn or 80gn HPBT Sierras.I sure as hell would

[Ikkarus]

Hey duncan61, still got a few flavours of the 55gr stuff that'd I'd already bought and have ordered a few boxes of the 69gr Aussie Outback with the HPBT sierras in em. I'll definitely be keen to try some heavier stuff too and see how it goes in a couple of weeks.

[duncan61]

I experimented with Target shooting at the Coolilup range and went down with my .222 to become world champion and it did not make 400m.Which is why I ended up with the 7mm Rem Mag.Sierra make a.284 dia. (7mm) 197 gr. HPBT MatchKing.But my biggest pill is 175gn in my Sendero.Perhaps others could tune me in with what chamber can launch a .284 dia. (7mm) 197 gr. HPBT

[Gwion]

It will come down to twist rate for stabilisation, Duncan.

I found this Berger stabilisation calculator the other day:
http://www.bergerbullets.com/twist-rate-calculator/

[duncan61]

Hey thanks for that 7mm.168gn HPBT Matchkings are perfect for my 1;9.25 twist and 26 inch barrel.I jagged it on the first go.I wondered why they grouped so good when I made them years ago.My only hope to get any better would be to Rechamber to 7mm STW the gunsmith will do the chamber better than the mass produced rifle maker which lends its self to better grouping at distance

[bladeracer]

I experimented with Target shooting at the Coolilup range and went down with my .222 to become world champion and it did not make 400m.Which is why I ended up with the 7mm Rem Mag.Sierra make a.284 dia. (7mm) 197 gr. HPBT MatchKing.But my biggest pill is 175gn in my Sendero.Perhaps others could tune me in with what chamber can launch a .284 dia. (7mm) 197 gr. HPBT

Nothing to do with the chamber, it's all down to the twist rate. Sierra spec is 7.5" twist or faster. The Sendero should be 9.25".
You can get even heavier .284" bullets - up to 208gn.

[Oldbloke]

Just got off the phone to the GS now and they were happy to swap it for a 1in8 twist. 2 more weeks waiting but I think I'll be happier with it in the long run. Thanks again all for your help and advice!

Wise move.