M14 Forum


Colt SP-1 Ammo?

This is a discussion on Colt SP-1 Ammo? within the M16 AR15 forums, part of the Rifle Forum category; Ok, here it goes. I have a like new colt sp-1 in .223, and I also have a bulk load of military 5.56 ammo. Has ...


Go Back   M14 Forum > Rifle Forum > M16 AR15


Reply
 
LinkBack Moderator Tools Display Modes

Old April 16th, 2010, 02:09 PM   #1
Snappin In
 
Swpcnut's Avatar
 
Join Date: Apr 2010
Location: North Carolina
Posts: 39
Red face Colt SP-1 Ammo?

Ok, here it goes. I have a like new colt sp-1 in .223, and I also have a bulk load of military 5.56 ammo. Has anyone shot that in a older .223 black rifle? I know that pressures are higher, etc. and I accept all the responsabilities, implied and other. Thanks!


Last edited by Swpcnut; April 16th, 2010 at 02:11 PM. Reason: distinguish what caliber
Swpcnut is offline  
Remove Ads
Old April 16th, 2010, 02:23 PM   #2
Lifer
 
2336USMC's Avatar
 
Join Date: Feb 2007
Location: The Road
Posts: 2,953
If your stash is M855/SS109, 62 gr green tip bullets, they will fire safely from your SP-1 but accuracy will be horrible. The 62 gr steel core bullets are just too long to be stabilized by the older 1:12 twist SP-1 barrel.

You want the older type M193 ball with the 55 gr bullet, like federal XM193, or commercial ammo pretty much any bullet weight up to 60 grs or so.

2336USMC is offline  
Old April 16th, 2010, 02:42 PM   #3
Old Salt
 
M21guy's Avatar
 
Join Date: Jan 2010
Location: WI
Posts: 1,656
55gr or less in that rifle. Accuracy goes south with heavier bullets and it's twist rate. The XM193 wouldn't be bad probably. I gots to tell you from my Colt 6920 with a much faster 1/7 twist it seems to shoot TAP training 55gr loads pretty well for some reason. (TAP in a non reloadable steel cases for cheaper practice) Better accuracy than the XM193 Federal stuff.

M21guy is offline  
Old April 16th, 2010, 03:46 PM   #4
Dodgin' The Reaper
 
1KPerDay's Avatar
 
Join Date: Mar 2007
Location: mountain west
Posts: 5,160
I've shot probably 5,000 LC69-72 55 gr ammo through mine... that's what it was designed to shoot. Have at it.

1KPerDay is offline  
Old April 16th, 2010, 04:41 PM   #5
Snappin In
 
Swpcnut's Avatar
 
Join Date: Apr 2010
Location: North Carolina
Posts: 39
Red face ?

I figured that the 1:12" barrel on mine would probably be better off with something up to about 60gr. I guess I should just ask the question!!! Will it blow up? With the slight differences ie. pressures, etc.(per Amer.Riflemn Sept.07) between the two cartridges do I need to worry and trade 500rds of 5.56 for .223rem rds. or just shoot and have fun! Thanks folks for the advice and I accept all responsibility.
GO

Swpcnut is offline  
Old April 16th, 2010, 07:25 PM   #6
Old Salt
 
tnw50cal's Avatar
 
Join Date: Jan 2006
Location: ohio
Posts: 1,453
What he's asking is is it safe to shoot 5.56 in a rifle marked 223-----Yes although marked 223 a Colt SP1 is chambered for 5.56

tnw50cal is offline  
Old April 17th, 2010, 11:10 AM   #7
Old Salt
 
Albud3's Avatar
 
Join Date: Dec 2008
Location: Prattville, Alabama
Posts: 1,135
Post 5.56 mm in an AR-15 (SP-1)

A Colt AR-15 (SP-1) receiver is marked as .223 Rem. but the barrel is chambered for the 5.56mm. As long as the barrel has the markings C MP CHROME BORE it was made to GI specifications and will safely handle the 5.56mm round.
HOWEVER!!!! Some early AR-15s were chambered for the .222 Rem. and the .223 Rem. These barrels are so marked and as such, the correct ammunition must be used.

Albud3 is offline  
Old April 21st, 2010, 01:21 PM   #8
Platoon Sergeant
 
Join Date: Aug 2008
Location: USA
Posts: 339
55 grain was designed for a 1-12 twist barrel, 62 grain was designed for 1-7 twist barrel, either one will fire the other, with no chance of blowing up either gun. Just a matter of accuracy


Rocky

Rocky is offline  
Old April 23rd, 2010, 06:30 AM   #9
Designated Marksman
 
Join Date: Jul 2007
Location: sw SD
Posts: 687
Quote:
Originally Posted by Albud3 View Post
A Colt AR-15 (SP-1) receiver is marked as .223 Rem. but the barrel is chambered for the 5.56mm. As long as the barrel has the markings C MP CHROME BORE it was made to GI specifications and will safely handle the 5.56mm round.
HOWEVER!!!! Some early AR-15s were chambered for the .222 Rem. and the .223 Rem. These barrels are so marked and as such, the correct ammunition must be used.
I did a little checking on early AR/M16 rifles and calibers.Just about everything checks out other than the 222 rem chambered in the ar15/m16. Being THE varmint cartridge back then(.222 rem) but the availability of .223 rem/5.56x45 brass, surplus ammo pretty much sunk the excellent .222 rem and .222 rem mag.
The AR/M16 was chambered for what was called for a short time the .222 rem special/ that was settled on as the .223rem/5.56x45 basically identical and interchangeable calibers.

OT but there been an awful lot of modifcation to the basic 5.45x45 Nato cartridge/brass and even platform.6x45 approx '65' supposedly could launch the 105gr smk @ some 2400-2500 fps from the 20in bbl!With a modernized100-105gr m855type projectile.. Maybe now that longer heavier bullets can be lauched @decent velocity77gr m855type design with fagmenting jacket or designed to tumble,as in hollow tipped FMJ serious wounding could be inflictedi n the 5.56
it would seem to hold promise penetrating hard targets and inflicting serious wounds in soft tgts..fragmentation.tumbling?
\But trned to2100-2200 fps.From the M4 I dont wanna know.
I dont understand its use anyway in the mountains and long range deserts of afghanistan,Iran-maybe even iraq.Particularly gonna need some range and reliability in a saw not a marine corp generated design for an M16 based saw.I sincerely hope
yhy

grndpndr is offline  
Reply

  M14 Forum > Rifle Forum > M16 AR15



Search tags for this page
ar 15 barrel c mp chrome bore
,
colt 1977 sp1 ar15 223./5.56x45 ammo comparisons
,
colt ar 15 sp-1
,

colt sp-1 223 or 5.56

,

colt sp1 .223 or 5.56

,
colt sp1 5.56 or .223
,
colt sp1 5.56 or 223
,
colt sp1 desirability
,

did colt sp-1 come in calibers other than 223

,
early model sp1 twist rates
,
what does a 1977 colt sp1 look like
,
will colt ar 15 sp1 handle 5.56 ammo
Click on a term to search for related topics.

Moderator Tools
Display Modes


Similar M14 Forum Discussions
Thread Thread Starter Forum Replies Last Post
Two Ammo Vendors Speak-out On Prices & Availability 411man Ammunition 35 January 20th, 2014 04:32 PM
Remington Managed Recoil / 30-AR ammo Sigma05 Ammunition 5 March 23rd, 2010 11:37 PM
Springfield Armory Ammo Recommendations mnhusker Ammunition 17 September 16th, 2008 03:29 PM



Top Gun Sites Top Sites List