.223 1in 9 twist

[TrxR]

How heavy can you go with a 1in9 and how far can you go with the 1 in 9 ?

 

[TrxR]

The reason I ask this is that it is one of the factors on me deciding between a LRPV or a BVSS.

Any suggestions?

 

[carbonrod]

I am not sure what you call far, and what degree of precision you are after, but we shoot lots of 1:9s out to 500m in service rifle. If you really want to go far, you will want higher BCs served with a 1:7. In theory, that should get to into a 90 grain tip.

Why build it though? There are some good starting points on the EE right now IMO:
http://www.canadiangunnutz.com/forum/showthread.php?t=413499

 

[guntech]

Barrel makers suggest all sorts of stuff...

from Shilen's site

.224 CF
- 7" for bullets heavier than 70gr.

- 8" for bullets heavier than 70gr.

- 9" for bullets up to 70gr.

- 12: for bullets up to 63gr.
- 14" for bullets up to 55gr.

- 15"* for bullets up to 55gr. driven 4,100 pfs or more
- 16:* for bullets up to 55gr. driven 4,300 fps or more

 

[manitou210]

Get the 1/7 twist savage 12 VLP DBM
They shoot the 80 & 90gr bullets very very well and you will be good to 1000y

 

[Mystic Precision]

Standard 9 twist Savage will stabilize either the 75gr Amax or Berger VLD.

With some set up fussing, this combo has been shot out to a mile - factory Savage BVSS I believe.

Far enough?

Jerry

 

[Max Owner]

1 in 9 should be good for 62 to 77 grain bullets.

I have the LRPV and like it so far. Haven't been beyond 200 meters, though. Hope to take it to 1,000 yards.

 

[roberti11]

The answer depends on the bullet, for the most part it is the length that will limit you. If you fix the parameters of bullet dia, twist and velocity then the major factor that will contribute to stability is bullet length, the overall length is related to the bullet construction

In my Rem700 PS 1:9 I am able to shoot and stabalize
Sierra 69gn (l=.898)
Sierra MK 77gn(l=.998)
Berger 73 gn(l=.945)
Hornady 68gn(l=.985)

I could not stabalize Hornady 75gn Amax bullets (l=1.070)

I have used the 77's out to 800 yards, the wind is a pain at that distance, but not unexpected for a .223 bullet that weighs 77gn

If I was rebarreling I would go with a 1:7 twist

 

[NewInWestsyde]

How heavy can you go with a 1in9 and how far can you go with the 1 in 9 ?

i have a savage Mod 25 (not highly precision mind you) with a one in nine twist and been shooting F-class here locally with it(locally being Kamloops and a rig that does not compare to a few of the fellow posters on this site theirs are magnifacent) been using the 69 seirra's and getting adaquit results at 300 M at 500 a bit off. the Hornady 75 grain BHPT has grouped relly well and would like to try them one of these sundays when we have markers to see what kind of score is possible and the 75 grain A-max got my best score at 300 M but a little to hot of load

on the other hand last sunday was out at a friends feild and at 510 meters 16 shots hit 14 spray paint cans with a box of American Eagle 50 grain flat base hollow point (thinking of leaving cans on the kill pile to "Tag" the coyotes green and blue and orange this winter for the enjoyment of the next fellow putting their sights to a painted doggie)

 

[Obtunded]

The answer depends on the bullet, for the most part it is the length that will limit you. If you fix the parameters of bullet dia, twist and velocity then the major factor that will contribute to stability is bullet length, the overall length is related to the bullet construction

Bingo. 'nuff said.

 

[.30/06 FTW]

Based on my experience, 75 gr AMAXs are too heavy. For my R700P 69gr is fine and the farthest I've shot is 600 yrds.

 

[maynard]

I've shot 75 gr Hornady out to 900m with a 1:9 twist.

 

[beltfed]

the major factor that will contribute to stability is bullet length, the overall length is related to the bullet construction

....and to go one step further, it is specifically the bearing length of the bullet that matters - not all 75 grain bullets have the same or even similar bearing length - the Hornady 75 HPBT and 75 AMAX are very different bullets.

 

[Ganderite]

The 75 Amax is longer than the 75 Hp BT.

When Savage was in the prototype stage with the faster twist barrels, I distributed 20 of them for evaluation. I wanted 1:8, but the fastest they would go was 1:9. This was before I convinced them there was a market for them in the target rifle field.

After testing 20 of them, with a modified chamber to take longer bullets, I found that even in the winter the 1:9 would stabalize the Sierra 80 mach bullet, the longest available at that time. But it had to be loaded hot to get the RPM up. This testing was done in the winter, when the air was dense (needed more RPM than the summer.)

In summer the 80 Sierra was easy to stabalise in all rifles.

Long range is not a stabalization issue. If the bullet is stable at 100 it will be stable at all distances. It actually gains stability as it goes down range because the air gets less dense. (less compression.)

I gave the original protoype to my father. It had a unique stock nothing like production and a special hand made serial number starting with Q.

 

[beltfed]

The 75 Amax is longer than the 75 Hp BT.

The overall physical length is, but the bearing length of the 75 hpbt is longer.
This is an important factor for those with 1:9s that may want to try longer bullets - It is worth noting that while one (75 amax) may work well in several similar rifles, the same should not necessarily be expected from another (the hpbt) by extension of weight or physical length alone.

Long range is not a stabalization issue. If the bullet is stable at 100 it will be stable at all distances. It actually gains stability as it goes down range because the air gets less dense. (less compression.)

What would you say to theories and experience of bullets loosing stability as they become sub-sonic?