Most manufacturers use 1070. Temper using molten lead. The kits from brownells and Dixie use 1070. As stated above..1095 isnt ideal.

My new mainspring/cocking limb for a Lancaster body action was hand cut from 1070, filed to shape and hardened/tempered in molten lead. This is probably the hardest working spring in any type of doublegun. It does a lot of heavy work. Its holding up extremely well.