[miles]

Hiya

If you're targetting 20-30kg sized fish, you have a few options. Start off by removing your reel. For that size fish, i wouldn't even worry about rigging the gun as break-away. Just a normal float-line, attached to the rear of your gun.

Floats. You have a few options. I can highly recommend you buying a 11ltr RA solid foam type float. They are SUPERB!!

Seeing as you already have a inflatable float, another option would be to get a second float. A cheap solution is a boat fender or bouy.

Simply rig the one end of your 30-40m floatline to our gun, the other end to one float. Then add another 2-10m to your second float.

A small 1meter bungee can also be attached to your first float. This can absorb some pressure and will make a difference on poorly placed shot!!!

So, you rig will be:
gun attached to 30-40m floatline attached to 1m bungee attached to first float attached to 2-10m of floatline attached to second float.

Another option is to build your own float using a boogie/body board. Using a big float will then mean only one float!! The downside to two floats is that they tangle, it means extra gear you have to carry and its costly.

Hope that helps!!

Regards
miles