Can this line take out black berry bushes

It takes out our Oregon wild blackberries like nobody's business! I have a push string trimmer and I have tried just about every line out there. No line is indestructible, but this stuff is as close as you can get. Far superior to anything I've used. Lasts much longer and cuts cleaner. It doesn't so much break off like other brands.....mine tends to get ripped/pulled out of the cutting head when the line wraps around some solid wood or wire fence.....wire fencing will destroy every line. This line takes out woody plants up to about 3/8 inch. I'm on my third roll of this line in two years and have knocked down litterally 6 acres of old growth blackberries and the dead woody stems of year's past. I'd only be on my first roll but my property is full of wire and old fencing and other hidden treasures the previous owners left me to discover....and that eats up the line. Hands down the most durable line out there! If you avoid tough wood and metal.....this stuff is awesome. The round inner core keeps this line intact so much longer than cheap solid line.

How many feet is this trimmer line?

The information said 251 when I bought it, but on the spool I received it was 264 feet. It took my guys 8 months to use a half of the roll. We cut grass, saw grass , what I call swamp grass, blackberry's, small saplings, not to mention normal every day rye grass, quack grass. It has saved me time and money worth every penny.

What do the numbers like 22-455, 22-855 and so on mean for Magnum Gatorline Square .155"?

The number 220455 and 22-855 are different part numbers that reference the size of the bulk product in question. Part number 22-455 is a 1lb bulk container that contains 84 feet of the .155" Square Magnum Gatorline. Part number 22-855 is a 3lb bulk spool that contains 251 feet of .155" Square Magnum Gatorline.