Hiya
With a gun that long, barrel flex will definitely be an issue. I've got a 150cm RA Carbon Vecta that shoots a 7mm and 7.5mm spear with 2x16mm bands. Its accurate and has sufficient power.
Try the RA 7.5mm spear. The added weight will make the gun sink with a spear in, as well as offer more hitting power. I don't have any experience with a railgun that long, so i really can't help much, but only to offer suggestions. If you're targetting smaller species, like pelagics under 10kg's, try the RA 6.6mm spear with your 18mm band. You'll be surprised at the results.
Regards
miles
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