300 - 310
Your going to need 40 x Fel Iron Casing, 60 x Handful of Fel Iron Bolts and 45 x Elemental Blasting Powder, so just make all that first and you'll get to 310+.
310 - 320
Fel Iron Bomb (1 x Fel Iron Casing (3 x Fel Iron Bars), 2 x Handful of Fel Iron Bolts (1 x Fel Iron Bar) 1 x Elemental Blasting Powder(1 x Mote of Fire, 1 x Mote of Earth)) x 10
320 - 335
Fel Iron Musket (2 x Thorium Tubes (12 x Thorium Bars), 3 x Fel Iron Casing (9 x Fel Iron Bar), 4 x Handful of Fel Iron Bolts (4 x Fel Iron Bars) x 15
335 - 350
White Smoke Flare (1 x Netherweave Cloth), 1 x Elemental Blasting Powder (1 x Mote of Fire, 1 x Mote of Earth)) x 25
350 - 355
Felsteel Stabilizer (2 x Felsteel Bar) x 5
355 - 360
Ultra-Spectropic Detection Goggles (4 x Heavy Knothide Leather, 2 x Khorium Bar, 2 Deep Peridot, 2 x Small Prismatic Shard) x 5
360 - 375
Khorium Scope (1 x Hardened Adamantite Tube (3 x Hardened Adamantite Bar), 4 x Khorium Bar, 2 x Dawnstone) x 15
Approximate Required Materials
255 x Fel Iron Bars
35 x Mote of Fire
35 x Mote of Earth
10 x Felsteel Bars
20 x Heavy Knothide Leather
70 x Khorium Bars
10 x Deep Peridot
10 x Small Prismatic Shards
45 x Hardened Adamantite Bars
30 x Dawnstones
25 x Netherweave Cloth
180 x Thorium Bars