deadeye1122
Member
Do any of the current,modern rifle makers offer a true 5.56 bolt action rifle? Just curious. Thx deadeye
forgot to add not custom.
forgot to add not custom.
Not exactly. If you measure a 5.56 NATO round in a .223 Rem chamber, the .223 Rem chamber's tighter dimensions will cause the pressure to spike. If you measure a .223 round in 5.56 NATO chamber, the NATO chamber's slightly larger dimensions will allow pressure to drop compared to the SAAMI Spec .223 Rem chamber. If there was no difference there wouldn't be different chamber dimensions.The NATO pressure testing standards are taken at the neck of the cartridge case and SAAMI and CIP measure the pressure at the approximate middle of the case and this is why you see a difference in chamber pressure. If both types of ammunition were tested the same you would see no difference in chamber pressures.
See above. Also, here's the link to the chamber dimensions bigedp copied without citing - http://www.ar15barrels.com/data/223vs556.pdf - in the original format it's also readable.Why does it have to say 5.56 on it what is the diff. between it & a .223 ?
You're free to believe what you want to believe. You have a .223 Rem chambered gun that doesn't have a loose chamber? Feel like shooting 5.56 NATO MK 262 ammo in it?The difference between the .223 & 5.56 NATO chamber is for battle purposes , you know dents & dirt & such . Same with the rounds .
I hope it don`t , the thin walled .223 would be prone to splitting !You're free to believe what you want to believe. You have a .223 Rem chambered gun that doesn't have a loose chamber? Feel like shooting 5.56 NATO MK 262 ammo in it?
That only applies to .223 rifles built on full size actions. It doesn't preclude problematic extraction either. I agree with your reasoning in that circumstance if, IFF, cases extract smoothly.This of course is NOT the correct answer
In a full sized bolt action that can handle large case head 65k + psi belted magnums my 5.56 ammo can have pressure spikes all it wants in the guns 223 chamber. Which won't cause such an action the slightest distress with 223's diminutive bolt head/thrust. Remember SAAMI is color blind, to them everything is black or white, under max pressure FOR THE CARTRIDGE or above. The action in questions pressure ratings do not apply
As far as I'm concerned 223 is 5.56 in full sized bolt guns, if my twist will stabilize it and the throat is long enough to chamber it I'm shooting it
That only applies to .223 rifles built on full size actions. It doesn't preclude problematic extraction either. I agree with your reasoning in that circumstance if, IFF, cases extract smoothly.
There are also rifles like the CZ 527 (which may actually have 5.56 chambers, but I'm not sure), amongst others, which are built on micro actions. I don't know what the pressure tolerances for all those rifles are either. Perhaps you can enlighten me. I'm not a bolt rifle expert like some here are.