Don't tell my wife I stole her Fiskars Anvil shears from her garden shed. These work amazingly well for both stripping the wire, if you're careful, and for cutting it. I have cut up to 4/0 but it is more comfortable cutting 3/0 and down. Costs about $12.00 at Home Depot.
You may laugh but these Fiskars Anvil Pruners are my go-to tool for cutting and stripping large GA battery cable. I go through about two pairs per year but overall they cost less than large wire cutters that also go dull and need replacement. They also fit neatly into my tool bag. I have found them on-line for as little as $9.00....