Powder loads

[B P Maniac Shooter]

Yes....you can use 4F or Swiss Null OB down the barrel. The barrel will handle the pressure.
I see it as a waste of powder though and flinching would be more likely.
Would I do it ? Nope, but your mileage may vary trying it.
I've tried exactly what you're asking at the 2:25 timestamp in the video below:

 

[wrcforge]

Proof please. I've heard this mantra for decades and no one has ever demonstrated it is dangerous or produced evidence to support the assumption.

its your life!!! I really don't care...your on your own...

 

[Johnny Tremain]

Proof?
Find a Dixie Gun Works catalog in the back they loaded a modern barrel full and two balls and set it off. (remotely) and the barrel did not break.

Looks like the cone took damage from hitting the ground.

As far as duplex loads, Ive blown modern firearms doing this. (only once, was blind for 10 months).

I even did a grain of green dot behind 68gr black an a 405gr pill.
Did not hurt anything, but had way more recoil.

 

[Britsmoothy]

its your life!!! I really don't care...your on your own...

Nope sorry, I'm not alone.
Typical response from someone when asked for evidence. Rather than admit they know not what they are speaking of.

 

[1BadDart]

I wouldn't hesitate to use 4F in my .40 or .50 if I was in a pinch and it was all I had. I can't imagine that a normal load for whatever caliber and a patched round ball could create enough pressure to damage anything.

Do stupid stuff and win stupid prizes.