Thanks il have herd u get a better cast with a heavy line ie fishing a #8 waight line on a #7 rod is this true or false
Its false
It's also true
Herewith a useful explanation from the late great Lefty Kreh:
There are situations where using a line heavier than the rod calls for will also aid in casting and catching fish, such as when fishing small streams for trout. Where pools are short and casts are restricted in distance, a heavier line can be just the right answer. For example, on many brook trout streams, the pool may be only 10 or 15 feet long and you are forced to use a leader that is at least 7-1/2 feet long. That means that only a few feet of your fly line — the weight that loads or flexes the rod — is outside the rod tip. When fishing where distance is very short and only a few feet of fly line are outside the rod tip, it is important to switch to a line that is heavier. For example, if you were using a rod designed for a four-weight line and had to cast most of the time at targets less than 20 feet, placing a five- or even a six-weight line on the rod would let you load the rod, and casting would be much easier.I suppose it depends on what the qualification of 'a better cast' actually is.
Whilst we dwell on that, go buy an SLX 7 you'll be fine
Buy some time with an instructor as well and you'll be even better