When knitting with chunky wool, the recommended needle size is generally around 7-8 mm on average, while 5.5-6 mm will give you a tighter fabric. The knitting needles that are typically used with bulky and chunky yarns are US9-US11, while super bulky yarns are commonly paired with US11-US17. The recommended needle size for bulky yarn is from US 9 (5.50mm) to 11 (8.00mm), so choose a needle in this range if using bulky yarn. Here is a summary of the recommended needle sizes for chunky wool:

• 7-8 mm on average
• US9-US11
• US 9 (5.50mm) to 11 (8.00mm)

Its important to note that the recommended needle size may vary depending on the pattern and the desired outcome. Using a larger needle size than recommended will give you looser, more open stitches, while using a smaller needle size will give you tighter, denser stitches.