My Massey is rated for about the same horsepower as yours, & I handle a 7 foot box blade no problem. I also handled an 8 foot back blade with my LS R 4047 with no problem either. So, you're 46 should handle 7 foot just fine, the only drawback is that 6 foot implements are abundant and easy to find making them less expensive to purchase compared to the seven or eight foot models.