Not necessarily true regarding 180's vs 150's. The primary factors are the twist rate in your barrel, and your elevation. I've got a 10 twist 300 WM that consistently shoots 137 through 180 grain bullets sub moa or better out to 500+ yards. The 137's are running 3800 fps, the 180's about 3200 fps. Tried heavier bullets (over 200 grains) in this one and the twist rate on the barrel won't stabilize them with this twist rate and my elevation of 900 feet. A faster twist (in 30 cal, 1/9 or even 1/8) works great to stabilize the really heavy bullets. Check your twist rate, it will give you an idea of what bullet weight range is practical to run in this rifle. If you're shooting factory ammo and you settle in on 150's or 165's I'd try several different types to find what the rifle likes best. If you tried 6 or 10 different types, you'd likely find 1 or 2 that really stand out. That's been my experience, your muzzle may vary.Well it only took me about 10 rds or so to sight in 180g federal premiums with very average scope. I bought this ammo simply because in reading about the 300 I learned it tends to pattern better with 180s vs 150s. Not true?? This gun was simply an impulse buy. I do like it tho. Maybe just restocking, using 150s and a better long range scope will be the ticket
Stocks and triggers can be great aftermarket improvements to help make factory rifles more accurate.