Totally agree. I do not have one but my buddy does and I have debated for years. I already have a bunch of cool guns that I do not shoot. I do shoot near identical velocities and trajectory in a 454 rifle and a 45-70 guide gun, That being said, when you trajectory is pretty good to 200 yards but drop quick after that, I really do not see much hunting application beyond 200 yards, which means to me anything under a 2 inch group or 4 inches at 200 yards is all that I need. The only animals I shot at 200 yards are big animals, I do not shoot any small deer, The last 3 I shot we weighed, all 3 over 180 pounds dressed.g
.450 Bushmaster is a neat cartridge, within it's limits of course. Mine is an AR-15 platform with a pre-built upper from Moriarti Arms, and it's pretty darned accurate. I was having some ejection issues right up front and had to shave the ejection port just a little wider to resolve it. The fat cartridge would clear the ejection port, but just barely. It rubbed top and bottom on the way out. Opening it up just a fuzz helped a lot.
When developing loads, shooting at 100 yards, a lot of my 3-shot test groups were over 2". The Hornady Black factory ammo will group under 1" every time (if I'm on my game...) on 5 shot groups. So I knew it could do better. The factory duplication load of 37.9g Lilgun with a 250g Hornady FTX is quite a good load but not quite on par with the factory ammunition.
After a lot of testing I found that, 39.2 g of H110 gives me excellent 3-shot groups. The total cartridge length has a rather short hard-limit due to these pointy bullets and the magazine limitations, normally with a load like this I would try a few different seating depths but it's not feasible on this cartridge in an AR-15 unless you want to go single shot and feed them one at a time. I do not want to do that. My next load tests will be based on that H110 load, going up and down just a touch to see if it gets better before it falls off.
I would like to figure out a load for the Hornady XTP bullets next.
On mature deer the white tail is about 18-20 inches spine to belly and a muley is 22-24, some bigger. Looking at them head-on they are 12-15. Point is at 200 yards you have a pretty wide wobble factor and a gun that groups 4 inches at 200 should be an EZ shot from a strong rest. I have a carbine Ruger RSI that just does not group like my other guns, 1 1/2 on it's best day, but usually only will do 2 inches. I have killed a bunch of deer out to 300 yards with it, never missed one yet, but the same day I killed those deer, I had other guns in 243, 257 Weatherby, and 30-06 that would all group 1/2 moa. Anyway, all that to say I just do not see much complaint with a 2 inch group on a big fat cartridge. On the flip side I have a bolt action 12 gauge, with a rifled barrel and 3 x 9 x 40 scope on it, that will put those same 300 grain Hornady 45 caliber bullets in one hole at 100 yards. Pretty funny the first time you do it and really impressive the second group. They are about $3 each, so I only shoot a few each year to check the gun.