Unfortunately it doesn't work that way, exactly.
Muzzle blast, in terms of sound, has to do with pressure in the barrel at the time of bullet exit; thus the "BOOM", or "POP" sound. So barrel pressure at exit is what counts mostly. THAT is determined by powder choice, and amount used.
So to give you a little more on this. The slower burning a propellant, the less complete burn is likely to happen(unless using a VERY progressive powder). This will tend to push the pressure curve farther along the firing event, and have a higher muzzle pressure upon bullet exit. The higher the pressure at bullet exit, the bigger the boom. To give you an idea, a 30-06 with a 150-class bullet will have muzzle exit happen somewhere around 1.4 milliseconds. Depending upon powder and barrel length of course, this will leave you with a muzzle pressure of 15-20,000psi. That is assuming a chamber operating pressure around 60,000psi(cartridge operational pressure).
The 7mm I believe has an operational pressure of 62-65,000 psi. With the same length barrel as an '06 the muzzle pressure will be higher. I don't know the operational pressures of the other cartridges.
Cheers!
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