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Joined: Sep 2012
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Campfire Ranger
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OP
Campfire Ranger
Joined: Sep 2012
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Will a 9 twist 223 stabilize a 75 grain bullet or do you need an 8?
Just curious.
Thanks
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Joined: May 2011
Posts: 15,859
Campfire Ranger
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Campfire Ranger
Joined: May 2011
Posts: 15,859 |
Okay, I'll take a stab at this. There are many who have much better insight but I'll tell you what I believe.
I'm not sure what bullet you're talking about but It's more about the length of the bullet than the weight. I would suspect you'll have better success using an 8" twist.
There are 2 rules to success:
1. Never tell everything that you know.
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Joined: Sep 2012
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Campfire Ranger
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OP
Campfire Ranger
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Campfire Outfitter
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Campfire Outfitter
Joined: Dec 2011
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Okay, I'll take a stab at this. There are many who have much better insight but I'll tell you what I believe.
I'm not sure what bullet you're talking about but It's more about the length of the bullet than the weight. I would suspect you'll have better success using an 8" twist. I'm no expert but I do believe bullet speed,length of barrel,and even altitude can have an effect as well.
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Joined: Sep 2008
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Campfire Regular
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Campfire Regular
Joined: Sep 2008
Posts: 1,362 |
A 9" will spin the 75gr BTHP, and sometimes will spin a 75 gr A-Max but an 8" is the best option for Amaxs and other similar bullets.
Brett
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Joined: Sep 2012
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Campfire Ranger
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OP
Campfire Ranger
Joined: Sep 2012
Posts: 18,243 |
Thanks Bret If I was building I'd go 8 but it's a factory rifle. CZ Carbine with 18.5" barrel to be specific. Their magazine is pretty short so I doubt I could load the VLD's. I really don't want to reload anyway, just thinking about a no muss/no fuss handy little truck gun/camp carbine/plinker/small to medium sized game rig. And before everyone starts....I'm NOT looking for suggestions. It's CZ or nothing.
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Joined: Nov 2013
Posts: 28,704
Campfire Ranger
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Campfire Ranger
Joined: Nov 2013
Posts: 28,704 |
Starts? When did anyone here ever start anything?
You must have this nice place confused with some other board.
BTW, shortactionsmoker has some 8" .22/250 Tikkas coming in.😜
What fresh Hell is this?
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Joined: Sep 2012
Posts: 18,243
Campfire Ranger
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OP
Campfire Ranger
Joined: Sep 2012
Posts: 18,243 |
Bastard......
What was it Wabigoon said the other day.....oh yea.....ask the 24hr what time it is and someone will try to sell you a watch.....
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Joined: Dec 2008
Posts: 78,300
Campfire Oracle
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Campfire Oracle
Joined: Dec 2008
Posts: 78,300 |
A 9" will spin the 75gr BTHP, and sometimes will spin a 75 gr A-Max but an 8" is the best option for Amaxs and other similar bullets. ^^^^^^^^^ This
"...the left considers you vermin, and they'll kill you given the chance..." Bristoe
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Joined: Sep 2012
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Campfire Ranger
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OP
Campfire Ranger
Joined: Sep 2012
Posts: 18,243 |
Thanks ingwe......I was hoping you would chime in.
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Joined: Aug 2006
Posts: 22,900
Campfire Ranger
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Campfire Ranger
Joined: Aug 2006
Posts: 22,900 |
are you off your meds? nobody 'hopes ingwe will chime in'..... he just does anyway.
wanna buy a watch? to go with that tikka?
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Posts: 42,695
Campfire 'Bwana
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Campfire 'Bwana
Joined: Apr 2004
Posts: 42,695 |
A one in 9 must be borderline for a 75 A Max...
in mine with that twist, the BTHP version is no issue...
The A Max version seems to do fine if I pump the velocity up and run it close to hot...
locally that translate to about 2800 fps MV.. couple thousand feet altitude...since JB mentioned altitude can play into it...
The 68BTHP is a good alternative... shoots as flat in my rifles as the 75s... and the 1 in 9 is no issue...
"Minus the killings, Washington has one of the lowest crime rates in the Country" Marion Barry, Mayor of Wash DC
“Owning guns is not a right. If it were a right, it would be in the Constitution.” ~Alexandria Ocasio Cortez
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Campfire Regular
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Campfire Regular
Joined: Aug 2012
Posts: 794 |
I had a savage LRP 1:9 twist and it shot 75gr Bergers in the .2-.3s. Sold it because it is a heavy accurate POS
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Joined: Oct 2002
Posts: 96,121
Campfire Oracle
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Campfire Oracle
Joined: Oct 2002
Posts: 96,121 |
The BTHP shouldn't be a problem. The Amax I wouldn't even bother with.
"Dear Lord, save me from Your followers"
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Joined: Dec 2008
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Campfire Oracle
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Campfire Oracle
Joined: Dec 2008
Posts: 78,300 |
The BTHP shouldn't be a problem. The Amax I wouldn't even bother with. ^^^^^^^^^^^^^ It took Steelie a long time to convince me on the 8 twist, but once one goes to it, "issues" seem to disappear.....
"...the left considers you vermin, and they'll kill you given the chance..." Bristoe
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Joined: Dec 2008
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Campfire Oracle
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Campfire Oracle
Joined: Dec 2008
Posts: 78,300 |
are you off your meds? nobody 'hopes ingwe will chime in'..... he just does anyway.
You know I'm always here for you Don... But I will go away if you give me Finn.....
"...the left considers you vermin, and they'll kill you given the chance..." Bristoe
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Posts: 22,900
Campfire Ranger
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Campfire Ranger
Joined: Aug 2006
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Joined: Mar 2006
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Campfire Outfitter
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Campfire Outfitter
Joined: Mar 2006
Posts: 14,475 |
A 9" will spin the 75gr BTHP, and sometimes will spin a 75 gr A-Max but an 8" is the best option for Amaxs and other similar bullets.
Yup
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Joined: Nov 2013
Posts: 28,704
Campfire Ranger
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Campfire Ranger
Joined: Nov 2013
Posts: 28,704 |
Bastard......
What was it Wabigoon said the other day.....oh yea.....ask the 24hr what time it is and someone will try to sell you a watch.....
Tonto, our work here is done!
What fresh Hell is this?
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Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,049 |
FieldGrade,
My experience is that 75-grain bullets will stabilize fine in MOST 1-9 twist barrels, at least in my part of the west, around 4000 feet above sea level.
This includes 75 A-Maxes, because plastic-tipped bullets actually stabilize easier than non-tipped bullets of the same length and weight. Apparently this is because plastic tips not only weigh considerably less than lead and jackets, but are usually more streamlined than even the sharpest hollow-points, reducing air pressure on the front end of the bullet, a major part of stability.
The JBM stability program takes into consideration the plastic tip, and predicts 75 A-Maxes will stabilize easily in a 1-9. The Berger program is based on the same basic formula, but doesn't have any provision for plastic tips, probably because Berger doesn't make any plastic-tipped bullets. It predicts the 75 A-Max as marginal in a 1-9, but that is not my experience.
That said, one of the 1-9 twist .224's I've owned, an AR-15 carbine, hated them. But so did a 1-8 twist .22/6mm Remington (.224 Texas Trophy Hunter) which happened to shoot 80-grain Berger VLD's very well--which are slightly longer than 75 A-Max's.
All of this leads me to suspect that something about the geometry of 75 A-Max's doesn't agree with certain throats, crowns or whatever. But in 1-9 twist rifles that "like" them, they will indeed shoot very well. So you never know until you try.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
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