More like notes to myself than a guide
D is damage, R is Effective Range, V is velocity, H is Handling

Bohemian #3
Basic (74 d 68 r 64 h) Fire (55 d 48 r) HV (74 d 58 h)

Caldvel Conversion and Caldvel Chain
Basic (104 d 84 r 300 v) Dumdum (91 d 73 r 270 v ) FMJ (97 d 79 r 270 v)

Caldvel Uppercut
Basic (130 d 96 r) Fire (97d 76r)

Nagant
Basic (91 d 73 r 330 v) Poison (68 d 58 r) HV (91 d 73 r 490 v)

Caldvel Pax
Basic Fire DumDum

LeMatt
Basic Fire FMJ
Basic DragonBreath Starfire Slugs

Nagant Officer
Basic Poison HV

Caldwell Rival (also Handcannon)
Basic Needles Slug

Specter
Basic Needles Dragonbreath Slug

Romero
Basic Starfire Pennyshot Slug Dragonbreath

Springfield
Basic Dumdum Explosive (57 dmg)

WinnieC
Basic Fire HV

Mosin
Basic Fire Spitzer

Winnie T
Basic Pennyshot Needles

Lebel
Basic Fire Spitz

Martini
Basic Explosive(149 dmg!) Fire FMJ

Crow and Knig 5
Basic Pennyshot

Crossbow
Basic Shotbolt Explosive

Nitro
Dumdum Explosive

Winnie
Basic Fire HV

Veretti
Basic Fire FMJ

Sparks
Basic Fire Poison (both 113 dmg)

Winnie Medium
Basic Poison FMJ