Shaft swap

Hi guys, just wanted opinions on spear shaft length and diameter preferences.

For much of my spearfishing life I have used shafts up to 9/32 in for all of my guns, 50cm to 130cm.
I've narrowed my preference to carbon steel (RA, Torelli, Spearmaster) style euro shafts because of their low price and durability.
My go to gun is currently a 100cm carbon franken gun (aimrite procomp barrel, Pathos D2 mech/handle, mvd roller muzzle). Its a dedicated reef gun, for long and close range fish.

I have a 140cm carbon steel torelli shaft in 7mm. This setup seems to work, and i have landed plenty of fish with it. I do however have problems with full penetration on some longish shots on thicker fish.
Im wondering if i should switch my 7mm trusty rusty, with a 7.5 or 8mm shaft of the same or shorter length.

Theoretically this would be advantageous to me...theoretically. based on these thoughts
-shorter shaft=stiffer shaft
-thicker shaft=stiffer shaft
--Im hoping with a thicker shaft, more energy will be transferred to the shot, with less shaft whip, also a heavier shaft will result in more momentum and penetration.
-with a roller muzzle recoil should be manageable even with the heavier shaft.

any thoughts?

Quote from Marco

If you go up to 7.5 mm shaft, I would go down 10 cm in lenght. Aiming will be different and your first 4-5 shots will be kind of high, but then you will get used to it and your gun will handle better as it will be 10 cm shorter.

If you stay with the same lenght, your gun will be too nose heavy and not nice to carry for long time periods.

However, for longer shots, you will need a longer gun. That's what they are for.

Keep your spear tip very sharp. That helps A LOT in penetration matter.

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Thanks for the advice . I think I'll try the 130cm 7.5mm.

I didn't think about the balance of the gun with the 140cm. Shaft

Yeah...longer gun = longer shot....But the 100 is so comfortable😩, oh well I better suck it up and work on my stalking skills.😆😆.

I shoot a lot of rocks... Ergo carbon steel shaft. 😂😂 keeps sharp when spring steel would be flattened.

Quote from Dude george

Dude I love when you talk gun porn!! :laughing:
I would add one simple tip, lots of guns are now going thicker shafts that previously could not or would not, the reason you ask? The ability to put on the small inner diameter rubbers allows you to power the heavier shafts without having to add another rubber to your set up, and no big increase in recoil! Get some small id rubber bro if you dont have already, i actually went down to 14 mm verses my old 16mm

Been reading a lot about that stuff. Never tried it but if u recommend it, there must be something to it.😄