That's exactly where I was going-DD's are very temperature sensitive and way too much effort in that they can only be struck once, attempt to 'fix' a high or tipped head and it will crack and need drilled out plus there's the need for a commercial -40f or lower freezer-yadda yadda go with the E rivets. And make certain that both the fastener 'set' and your bucking bar are clean and have no tape or crud on them, whatever is on either the set or the bar will transfer to the driven fastener because they go 'plastic' while being driven, which is how they fill the hole. Contrary to 'old wives tales' tape will NOT help the set stay put, proper technique is the only thing that will. Make sure your bucking surface is clean, clear, and well polished for the same reasons. In the coure of building a wing spar set, Boeing probably tosses out 100# of normalized (room temp) DD rivets per spar set. Proper technique is like learning to play a musical instrument, practice, practice, practice. Also make sure the set is THE CORRECT ONE for the fastener type and size being shot otherwise you'll 'ring' the head or cut the structure.
You need to become aware and atuned to the fact that a rivet will tell you how it's doing as you shoot it, when the tone of shooting goes from initially sharp to flat (around 2 to 3 1/4 seconds) stop shooting! A well working team of shooter and bucker is pure music to hear! About every 20 seconds they shoot another fastener braap....braap...braap-remember this is actually art as much as anything else.
Use a rivet gun and bar that are up to the job, too small will cause too many errors and too big will cause too much damage.
Were you aware there are at least three types of one piece, driven mechanical fasteners in aviation? On the West Coast we call them 'RIVETS' in the South they are called 'RIVITS' and in the mid West they are called 'RIVUTS'.
We will not speak here of the dreaded and feared by novices, MONEL rivet which has its own ju-ju.
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