That's not entirely accurate. The gest is that he didn't use enough foam, or shouldn't have been using foam with the 5744 powder, or both.

Only one plug on top of 45gr of fast-burning powder (I believe) demonstrates Wright's Secondary Projectile Effect.

Here's the post. You decide.

I just got a call from a guy in California who loaded 45gr of Accurate 5744 with 1 Kynoch foam wad under a 500gr cast bullet in his 470.

Although he'd shot 50 or so of the same rounds, the result of "the one" was a pair of Kreighoff 470 barrels that separated at the breech end.

The guy that called me was the owner of the rifle. He was also the guy that loaded the ammo, and he was the guy that pulled the trigger.

He pulled the trigger on the reduced load, the gun doubled with excessive recoil. He could not get the gun open after firing. He took it to a gunsmith, who had to pry the barrels open. The right barrel cartridge was separated, but the left barrel cartridge looked fine.

The gun was sent to Kreighoff. Krieghoff said the barrels were separated at the breech and that the action would have to go back to Germany for inspection before they would consider putting new barrels on it.

Obviously, one foam plug was not enough filler for such a small amount of powder (see Graeme Wrights' explanation of the "Secondary Projectile Effect.")

However, Accurate also indicates that no filler is necessary with 5744 loads. Either way, the barrels (and likely the action too) are toast.

Just don't want to see anyone else repeat this exercise.