Quote Originally Posted by rsilvers View Post
I corrected you the last time, and you keep on misrepresenting my position. I have never said that an SSA tactical load was dangerous. Please quote me say that from anywhere on the internet.

What I did say was that:

5.56mm is 0.332 inches in diameter on the case head, which is 0.08657 square inches. 62,000 pounds per square inch is 5313 pounds into the bolt.

6.8 has a case head of 0.358, which is an area of 0.10066 square inches. In order for this also to have 5313 pounds into the bolt, you need to limit it to 52,785 psi.

To be clear - 62,000 psi for 5.56mm is the same as 52,785 psi for 6.8.

Moreover, the 6.8 bolt is weaker than a 5.56mm bolt.

If the 6.8 spec was raised to 58,000 psi, it would be like 5.56mm at 68,000 psi.

If the 6.8 spec was raised to 60,000 psi, it would be like 5.56mm at 70,500 psi.

So my point was, one cannot use 5.56mm pressure and 6.8 SPC pressure interchangeably, and so that it did not make good sense to load 6.8 over SAAMI max pressure on purpose.
Limiting the scope of the comparison to a AR-15 BCG as a means of writing off the caliber is a little short sighted, don't you think? If dedicated 6.8 lowers are on the horizon, then dedicated 6.8 uppers with stronger BCG designs are a logical evolution should the 6.8 take off any further.