I put together a loot.xml for this mod, similar to the one I posted in the 5.56 weapons mod thread. I sprinkled some of the flechette ammo into the ammo lootgroups as well, since I like it.
Tested it and have seen shotguns and the flechettes in crates, etc. Of course, all weapon drops are rarer in A21 than they were in A20 since they put in the new magazines.
Love the mod, especially the extended range guns.
<configs>
<!-- append shotgun flechette ammo to quest reward ammo group -->
<append xpath="//lootgroup[@name='groupQuestAmmo']">
<item name="ammoShotgunShellFlechette" count="40" loot_prob_template="QuestT2Prob"/>
</append>
<!-- define lootgroups, insert them -->
<insertBefore xpath="/lootcontainers/lootgroup[@name='groupScrapCommon']">
<!-- lootgroups for shotgun flechette ammo -->
<lootgroup name="groupShotgunShellFlechetteSmall">
<item name="ammoShotgunShellFlechette" count="1,2" loot_stage_count_mod="0.01" />
</lootgroup>
<lootgroup name="groupShotgunShellFlechetteMedium">
<item name="ammoShotgunShellFlechette" count="2,3" loot_stage_count_mod="0.01" />
</lootgroup>
<lootgroup name="groupShotgunShellFlechetteLarge">
<item name="ammoShotgunShellFlechette" count="3,15" loot_stage_count_mod="0.01" />
</lootgroup>
<!-- lootgroups for new shotguns -->
<!-- T1 -->
<lootgroup name="groupWeaponsT1_Boomstick_Doublebarrellong" count="all" loot_quality_template="QLTemplateT1">
<item name="IZYgunT1shotgunDoublebarrellong"/>
</lootgroup>
<lootgroup name="groupWeaponsT1_Boomstick_BoltactionShotgun" count="all" loot_quality_template="QLTemplateT1">
<item name="IZYgunT1shotgunBoltactionShotgun"/>
</lootgroup>
<lootgroup name="groupWeaponsT1_Boomstick_Model1887" count="all" loot_quality_template="QLTemplateT1">
<item name="IZYgunT1shotgunModel1887"/>
</lootgroup>
<!-- T2 -->
<lootgroup name="groupWeaponsT2_Boomstick_M31hunter" count="all" loot_quality_template="QLTemplateT2">
<item name="IZYgunT2shotgunM31hunter"/>
</lootgroup>
<lootgroup name="groupWeaponsT2_Boomstick_M1897" count="all" loot_quality_template="QLTemplateT2">
<item name="IZYgunT2shotgunM1897"/>
</lootgroup>
<lootgroup name="groupWeaponsT2_Boomstick_M870Police" count="all" loot_quality_template="QLTemplateT2">
<item name="IZYgunT2shotgunM870Police"/>
</lootgroup>
<!-- T3 -->
<lootgroup name="groupWeaponsT3_Boomstick_M4terminator" count="all" loot_quality_template="QLTemplateT3">
<item name="IZYgunT3shotgunM4terminator"/>
</lootgroup>
<lootgroup name="groupWeaponsT3_Boomstick_XM12G" count="all" loot_quality_template="QLTemplateT3">
<item name="IZYgunT3shotgunXM12G"/>
</lootgroup>
<lootgroup name="groupWeaponsT3_Boomstick_M590S" count="all" loot_quality_template="QLTemplateT3">
<item name="IZYgunT3shotgunM590S"/>
</lootgroup>
<!-- T4 -->
<lootgroup name="groupWeaponsT4_Boomstick_Saika12g" count="all" loot_quality_template="QLTemplateT3">
<item name="IZYgunT4shotgunSaika12g"/>
</lootgroup>
<lootgroup name="groupWeaponsT4_Boomstick_HEXAGun" count="all" loot_quality_template="QLTemplateT3">
<item name="IZYgunT4shotgunHEXAGun"/>
</lootgroup>
<lootgroup name="groupWeaponsT4_Boomstick_SPAS12" count="all" loot_quality_template="QLTemplateT3">
<item name="IZYgunT4shotgunSPAS12"/>
</lootgroup>
</insertBefore>
<!-- append new shotgun lootgroups to the general tiered ranged weapon groups -->
<append xpath="//lootgroup[@name='groupWeaponsT1_Ranged']">
<item group="groupWeaponsT1_Boomstick_Doublebarrellong"/>
<item group="groupWeaponsT1_Boomstick_BoltactionShotgun"/>
<item group="groupWeaponsT1_Boomstick_Model1887"/>
</append>
<append xpath="//lootgroup[@name='groupWeaponsT2_Ranged']">
<item group="groupWeaponsT2_Boomstick_M31hunter"/>
<item group="groupWeaponsT2_Boomstick_M1897"/>
<item group="groupWeaponsT2_Boomstick_M870Police"/>
</append>
<append xpath="//lootgroup[@name='groupWeaponsT3_Ranged']">
<item group="groupWeaponsT3_Boomstick_M4terminator"/>
<item group="groupWeaponsT3_Boomstick_XM12G"/>
<item group="groupWeaponsT3_Boomstick_M590S"/>
<!-- T4 -->
<item group="groupWeaponsT4_Boomstick_Saika12g" prob="0.3"/>
<item group="groupWeaponsT4_Boomstick_HEXAGun" prob="0.3"/>
<item group="groupWeaponsT4_Boomstick_SPAS12" prob="0.3"/>
</append>
<!-- append new shotgrun flechette ammo lootgroups to the sized ammo groups -->
<append xpath="//lootgroup[@name='groupAmmoSmall']">
<item group="groupShotgunShellFlechetteSmall"/>
</append>
<append xpath="//lootgroup[@name='groupAmmoSmallNoArrow']">
<item group="groupShotgunShellFlechetteSmall"/>
</append>
<append xpath="//lootgroup[@name='groupAmmoMedium']">
<item group="groupShotgunShellFlechetteMedium"/>
</append>
<append xpath="//lootgroup[@name='groupAmmoMediumNoArrow']">
<item group="groupShotgunShellFlechetteMedium"/>
</append>
<append xpath="//lootgroup[@name='groupAmmoLarge']">
<item group="groupShotgunShellFlechetteLarge"/>
</append>
</configs>