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9/22/2017 12:11:25 AM
Posted: 8/1/2005 1:09:06 PM EDT
I was wondering whether anyone thinks 1:7 is too high a rate of twist for 55gr. 5.56 ammo. Will this cause over stabilization? Most of the old Colt Sporters seem to be 1:7. Also, do any Colts have chrome lined bores? Like older prebans with A1 sights? That's kind of what I'm looking for. And a 5.56 chamber, but most Colts seem to be .223...unless they're just marked that way and actually all have a 5.56 chamber, I don't know..

As you can see, I need lots of help and any is appreciated!
Link Posted: 8/1/2005 1:17:29 PM EDT
most new civilian colts have a 1:9 twist and a 5.56 chamber, and I think colt is only croming the chamber.

the top of the barrel will be marked with the twist and chamber.

the lower will usually say 223/5.56 go by the barrel marking for the chamber.

1:7 will work for 55gr but it is not ideal.

Link Posted: 8/1/2005 1:53:35 PM EDT

Originally Posted By Psychosword:
I was wondering whether anyone thinks 1:7 is too high a rate of twist for 55gr. 5.56 ammo.
not necessarylyWill this cause over stabilization?what exactly is overstabilization? Most of the old Colt Sporters seem to be 1:7. Also, do any Colts have chrome lined bores?some do and some don't Like older prebans with A1 sights? That's kind of what I'm looking for. And a 5.56 chamber, but most Colts seem to be .223...unless they're just marked that way and actually all have a 5.56 chambermy guess would be that all chromelined colts have 5.56 chambers, I don't know..

As you can see, I need lots of help and any is appreciated!

Link Posted: 8/1/2005 4:07:47 PM EDT
No difference using 1/7 or 1/9 with 55 grain ammo at all in real life.
Link Posted: 8/1/2005 4:25:47 PM EDT
[Last Edit: 8/1/2005 4:26:01 PM EDT by phobia]
Read the Ammo-Oracle.
Link Posted: 8/1/2005 4:55:59 PM EDT

Originally Posted By phobia:
Read the Ammo-Oracle.



Have done so many times, but thank you for the suggestion.
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