Slitherine

explosion of artillery of XVI-XVII century was a considerable risk,why not a certain percentage of autolosses for every artillery fire turn ( not residual ) ?

I think you are overestimating the frequency of such events in this period. If you read the accounts of the historical battles included in the game, the only similar event you will find is the explosion at Wimpfen, which is modelled in the scenario, but which was due to gunpowder barrels exploding, not due to a gun exploding.