You might be a little cautious about going too small with your line diameter. If it's too small, then it can get caught between the spool and the frame and really get things screwed up. On my 4600 I've got 10lb test mono caught between the spool and the frame before. I don't go below 12lb test now. I'd think about something with a diameter no smaller than 12lb mono.I would think that you would probably have to go with 40# Power Pro. It has the diameter of 10# mono.
I agree with the mono backing,I go about 50/50,because of the price,but if could get on to big fish that had a chance of spooling the reel,I would go power pro all the way,but the stuff I catch I aint in danger of getting spooled.With a little bit of 30 lb. mono for backing ( just enough to cover the spool) an abu 6500 will hold 150 yards of 65 lb. power pro. The diameter of 65 lb. power pro is about the equivalent of 17 lb. mono. I buy it in 300 yard spools at Academy for about $19.
I back all my PP with mono. It keeps the spool from spinning under the braid when it freezes. I had that happen to me on lake whitney tourny and now dont have that prob. It also makes filling a spool that much cheaper and i change line every 3 months. Go to change line on 7 reels and cheaper means alot!I would have to agree with an earlier post, that 10-40 Power-Pro with a small amount of mono backing would fit.:wink: In fact thats what I have on my drifting reels (6500's), so that I can minimize how much wieght it takes to bounce off the bottom! I dont have 300yds on each reel though, I only put 150yds on each reel. I feel like, if Im in the boat moving and hook into a MAGNUM blue then I can go to the fish easy enough!:big_smile: