Nanuk 'N' frames can hold 8 rounds that's why.
Well for those of us with decades of 6 shot revolvers it does not work. Same reason I dislike 7 shot revolvers. Besides nobody makes a good 7 or 8 shot speed loader and moon clips suck for the 357 mag. It also makes a physically larger revolver with little to gain. Besides I do not like N frames, the trigger reach does not work for me. I can shoot them, but the K/L frame fits ME better.