Go for a Titan XS. OX springs are harsh, nasty, vicious, gun breakers, that loosen your fillings. Unless you saw about a third off of them. Plus they're square sectioned wire, with razor sharp edges that can shave bits off the inside of yor gun. Titan however, are very good Swedish silicone steel.
https://www.euroguns.co.uk/acatalog/...#atitanmsother