base damage with [Blaze]: 1752 (crit for 10337, vigilante crit for 18922)

[Ash]'s Bleed does 437.5% of base damage so each bleed is for 45224 on a crit, or 82784 on a vigilante crit
wear the vigilante warframe mods to get 15% vigilante upgrade chance

base 6 pellets, multishots give you 2.8x and 16.8 pellets

With [Blunderbuss] and [Laser Sight] active it hits 93% crit chance so your distribution is
0.07 1752
0.79 10037
0.14 * 18922
averaging to 10701

multishot takes hit average to 29963 and gives you
0.79 16.8 0.3 = 3.98 bleeds at 45224
0.14 16.8 0.3 = 0.71 bleeds at 82794

total is 29,963 hit + 238,776 bleed (133,715 if not [Ash])

With [Blunderbuss] and [Critical Deceleration] your crit chance is 71.4% so your distribution is
0.286 1752
0.607 10037
0.107 * 18922
averaging to 8618

multishot takes hit average to 24130 and gives you
0.607 16.8 0.3 = 3.06 bleeds at 45224
0.107 16.8 0.3 = 0.54 bleeds at 82794

total is 24,130 hit + 183,094 bleed (102,533 if not [Ash]) but you don't need to headshot and aim, fire rate of 0.82 though