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I dont have that one.Not quite too that extent but the Hornady reload books have info.
super helpful.This is the info they give
View attachment 1372292
perfect, thank you .
yes, this Im aware of.The 5.56mm NATO chamber, known as a NATO or mil-spec chamber, has a longer leade, which is the distance between the mouth of the cartridge and the point at which the rifling engages the bullet. The .223 Remington chamber, known as SAAMI chamber, is allowed to have a shorter leade, and is only required to be proof tested to the lower SAAMI chamber pressure. To address these issues, various proprietary chambers exist, such as the Wylde chamber (Rock River Arms)[70] or the ArmaLite chamber, which are designed to handle both 5.56×45mm NATO and .223 Remington equally well. The leade of the .223 Remington minimum C.I.P. chamber also differs from the 5.56mm NATO chamber specification. The casings and chambers .223 Remington and 5.56×45mm NATO are virtually the same dimensions, but due to the fact that .223 Remington is designed to handle much lower pressures than the 5.56×45mm NATO the rounds are not completely interchangeable. Firing a 5.56×45mm NATO round out of a rifle chambered in .223 Remington could be injurious or fatal to the user as well as the gun, however .223 Remington ammunition can be fired safely from almost any rifle chambered in 5.56×45mm NATO as the NATO specified rifles can handle much higher chamber pressures than the .223 Remington is capable of producing.
I suspect this is what I have going on, my guess is my 556 chamber is near the very bottom of the spec which is why I wanted to see the nato drawing. Theres still a chance my 556 chamber is too small because Ive had rare but a few 223 factory ammo sticky in the chamber. I do know if I bump my shoulder to just fit the Wylde chamber it wont fit the 556 chamber. The drawing BCP shared is helpful but doesnt show the same datum point so I still cant measure it but Im going to move on and just use the 223 spec. I want to develop 1 round for both rifles so I need to bump the shoulder to fit the (my) 556 and use the Wylde chamber to develop the load since its rated for a lower chamber pressure....in your 5.56 gun but more likely it is cut on the short side of the spec range for headspace. Couple this with your 223 wylde possibly cut on the generous side of spec for headspace and you will have the formula for what you describe.
I dont buy 556 ammo anymore since I got the 223Wylde.I'd just do the one for the 5.56 and call it good. Does any of the factory 5.56nato ammo match what you're looking for when you measure it?
Im not certain how shooting 556 will help me develope a 223 handload?Well, might be worth it to get some to use as comparison to help develop the load.