I'd still be surprised if using 35 percent H2O2 did not blow the barrel up.
The steel used in those barrels is a relatively cheap alloy...NOT like rifle-barrel "Proof" steel.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC !