is it ok to mix lead sizes in 12ga target loads

TKM,
IINM, it's the resistance to free recoil that sets the trigger. And, free recoil is determined by the weight of the gun and the mass and velocity of the load. Recoil reducers work on three principals: increasing the contact area (big recoil paid); buffering the recoil event (extending the time it takes to transfer the forces to the shooter); and, to a much lesser extent, energy absorption (recoil energy in converted to heat [but, I've never noted a recoil pad to get hot]).

That being said, in my experience (shooting a tubed Skeet gun with: a recoil reducer; altered inertial block; and .410-bore loads) sometimes the trigger won't set if the gun isn't held firmly against the shoulder.
 
Z, thanks for the formula. In my case we were working up 1 ounce loads (the mass). To get the gun to reset (the velocity). We were having to get the PSI up over 7900 which put the velocity above what we were trying to acheive but what was neccessary to reset the triggers. We tried this in several test guns and found this number to be consistent in Brownings for reliable ignition of the second barrel. You may not use the psi in the formula for recoil but it does have a direct effect on the velocity. Less pressure, lower velocity, no reset. Oh, by the way, at the time this is the number Browning gave us also. Its not set in concrete because every gun is a little different but its a good rule of thumb.
 
oloddrum - those variables can be changed with using different powders

I can have slow loads with higher pressures than faster loads by changing the powder (burn rate)

As Zippy pointed out - velocity and mass equal recoil
 
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