The weirdest thing in a long time happened to me today. Shooting a batch, and I had one misfire. thought it must have been a squib, but nothing happened. Shook the case and concluded that there was no powder. So the weird thing to me is why the bullet did not get pushed into the barrel when the primer ignited. Yes the primer did go off as the bottom of the bullet was black. I did not even hear a pop when the primer ignited. No bulge in the case, no primer back out that would explain where the pressure would go, nothing. Weirdest thing to me anyway.
You didn't state what calibre of rifle, maybe your namesake, a 303?
I recently tried that on purpose, no powder. I wanted to see if different primers moved the bullet further.
Actually, Bearhunter, on here, and I talked about this at the Vernon gun show.
The 45-70 dies were set up, so seated a standard rifle primer with the 420 grain cast bullet and no crimp.
As you say, it is weird, that there is absolutely no sound as it goes off. And this is in my basement, with, of course, no ear muffs on. So, not a sound, except for the firing pin hitting the primer, opened the action and out came the cartridge, just as it went in.
OK, now I will blow it out! Seated a magnum primer. No noise. No bullet movement.
Next I went to the 30-06. 165 grain bullet no crimp. Standard primer, no noise, cartridge came out just as it went in!
Magnum primer. No noise, bullet never moved.
Next I went to the Marlin, 44 mag. 240 grain cast bullet, no crimp. Standard primer didn't move it, magnum primer just barely moved the bullet, a bit. This one bullet test was really no test of the different primer power, as it relates to the 44 mag. I just took a couple of used empties, without knowing if one had a tighter neck, or not. More testing would be required before it could be stated whether, or not, a magnum primer had more power.
Like you, I too, was taken by the sooty, black residue on the bullet bases when I pulled them. All primers, I even used some large pistol ones, also, made the considerable amount of black residue.
My thought on this was, is the primer responsible for "dirty powder," often complained of, in pistol shooting? The whole inside of the cases were blackened up with this sooty material.