Double Shot

Bowman

\begin{aligned} K&=0.7\left(0.1+\frac{\text{mastery rank}}{10}\right)\\ P&\sim U(\min(P_0K,P_0),\max(P_0K,P_0))\\ R&=\left(J+\frac{aP}{d_P}+\frac{S}{d_S}+\frac{A}{d_A}\right)(W+W_{\mathrm{ammo}})\frac{p(n)}{100}\\ D&=\operatorname{clamp}\!\left(\left\lfloor R\,\frac{100}{100+F}\,\frac{e}{\lambda}\,(1+b/100)\,c\right\rfloor,1,99999\right) \end{aligned}

Effect

Weapon coefficients and primary/secondary stats are listed under Physical damage & weapons.
2 hits, independent rolls. Both projectiles are counted on this target; splitting between nearby monsters is excluded.

Double Shot values
Rank	Damage %	Hits	MP
1	80	2	8
2	82	2	8
3	84	2	8
4	86	2	8
5	88	2	9
6	90	2	9
7	92	2	9
8	94	2	10
9	96	2	10
10	98	2	11
11	100	2	11
12	102	2	12
13	104	2	12
14	106	2	13
15	108	2	13
16	110	2	14
17	112	2	14
18	114	2	15
19	116	2	15
20	120	2	16

Rank	Damage %	Hits	MP
1	80	2	8
2	82	2	8
3	84	2	8
4	86	2	8
5	88	2	9
6	90	2	9
7	92	2	9
8	94	2	10
9	96	2	10
10	98	2	11
11	100	2	11
12	102	2	12
13	104	2	12
14	106	2	13
15	108	2	13
16	110	2	14
17	112	2	14
18	114	2	15
19	116	2	15
20	120	2	16

Rank	Damage %	Hits	MP
1	80	2	8
2	82	2	8
3	84	2	8
4	86	2	8
5	88	2	9
6	90	2	9
7	92	2	9
8	94	2	10
9	96	2	10
10	98	2	11
11	100	2	11
12	102	2	12
13	104	2	12
14	106	2	13
15	108	2	13
16	110	2	14
17	112	2	14
18	114	2	15
19	116	2	15
20	120	2	16

Rank	Damage %	Hits	MP
1	80	2	8
2	82	2	8
3	84	2	8
4	86	2	8
5	88	2	9
6	90	2	9
7	92	2	9
8	94	2	10
9	96	2	10
10	98	2	11
11	100	2	11
12	102	2	12
13	104	2	12
14	106	2	13
15	108	2	13
16	110	2	14
17	112	2	14
18	114	2	15
19	116	2	15
20	120	2	16