140 or 150 grain, really doesn't make a difference. Either weight will be fine. In a "premium" type bullet I would tend to go with the lighter bullet, and with a standard "cheap" bullet I'd go heavier. But 10 grains isn't much and as I said it doesn't really make a difference. If it were me I would try to find any load with a bonded bullet such as the Nosler Accubond, or a 100% copper bullet such as the Barnes.