rollergun shaft diameter

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rollergun shaft diameter

Postby coreyf » January 22nd, 2018, 10:10 am

I shoot a 120cm single band roller. I've been told its a 3 stage loading process. The shaft has a loading tab and there are 2 hooks under the barrel. For seabass and yt it shoots a 9/32" shaft with a mori tip and 300lb mono. The band is 16mm and I know nothing of stretch ratios. Basically it's hard as F to load and that vein in my forehead pops out. It is setup with a MVD roller muzzle and it has taken some good fish. It has also not taken some good fish -- meaning pulled out shots from lack of penetration. I think I've lost more good fish with this gun than all others combined. I like the laser accuracy and would like to continue using it in the kelp.

My question is -- What is the best shaft diameter for a gun of this size. I thought the thin shaft would be light and carry far and penetrate well. It was brought to my attention that maybe a thicker 5/16 shaft is better. It will have more mass and hit harder, and penetrate best. Then there is the inbetween, 7.5mm shaft?

Will the 5/16" (8mm) be too heavy and fall short? The analogy of a feather was brought to my attention. No matter how hard or fast you launch a feather, it will only hit with so much force. Is a 9/32 shaft that feather?
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Re: rollergun shaft diameter

Postby ryno » January 22nd, 2018, 12:35 pm

Note: I'm by no means an expert on the subject and learn by testing out my own rigs.

I converted one pipe gun to a roller last year and built a wood roller gun as well, here are some of my findings after testing out for a couple months.
Image
Image
(Bands loaded in a safe location, temporarily just for photo before being unloaded)
Bands:
Small ID 14mm Primeline
Regular ID 14mm Primeline
(minimal difference in felt power between the two, small id harder to load but easier than 16mm)

Shafts (all tricut):
Addiction Custom 7.5mm
Salvimar 7.5mm
Red Tide 5/16"

I converted an 80cm pathos and built an 80cm rear handle (note they were single stage, one pull to load).

A couple things I noticed with the thicker shafts:
-->Minimal to No shaft whip
--> Shooting reef fish under 5lbs, the fish usually spin on the shaft after being hit
--> I could shoot into holes and not worry about bending a shaft
--> Shots feel like they have more punch
--> Thicker fish like big sheephead I get full penetration (behind gill plate)

Using a 14mm band some things I noticed:
--> Hand picked 14mm (9/16") rubber that was super stretchy
--> Easy to load
--> Release seems progressive rather than explosive

TL;DR
I like 7.5mm-8mm for all around applications roller and non-roller and generally shoot 14mm (9/16") bands.
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Re: rollergun shaft diameter

Postby chris oak » January 22nd, 2018, 8:49 pm

Corey I've got that 7.5mm shaft in mine, if you want to try it out let me know. I don't have any problem with penetration, BUT mine is still messing up where it's tanging in the bands like 30 percent of the time.
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Re: rollergun shaft diameter

Postby phil herranen » January 23rd, 2018, 11:46 pm

Thinner band ,and maybe a thicker shaft . If you overpower a roller they tangle more and you don't get althea potential out of it , and they are harder to load
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Re: rollergun shaft diameter

Postby coreyf » January 29th, 2018, 8:37 am

tried the 7.5. slight tug at the end of 2 wraps. maybe 8mm will be better?
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