Thanks for the input. The problem with living here in canada is trying to find a gunsmith to do a barrel. I spent almost $3000 on my .243 and i've been really happy, but it took me almost a year and a half to get my rifle. I am very detailed with my hand loading and spend a lot of time finding the best load for each of my rifles. I've also shot enough and done enough homework to know there are no garuntees, but i would like to buy a factory rifle that will give me the best chance of shooting groups with some quality time spent at the bench.
My vote for a factory rifle would be for the Remington Sendero in 300 RUM. However, for the accuracy your talking about, your going to need a custom rig or have work done on the factory rifle if you want consistant .5 groups.
Regarding that 300 WM that does not shoot to your liking. A year or two ago, I was over on the Jarret web site and saw that one of his pet cartridges was a 7mm x 300 Win Mag, I think he used an AI version.
Being an engineer by trade, that spun up the little wheels in my head and I got to thinking... This is when "thinking" ends up costing me a lot of money.
I do not care for the excessive freebore of the WBY Mag's. Seeing this Jarret wildcat got me thinking about a 270x300 WM. The thought of a 130gr Nosler AB at 3500+ FPS has a tangible degree of intrigue to me - perhaps it does for you-all too.
Sssssoooo, why not have that 300 WM action squared up and re-barreled to a 270x300 WM in a Hart 28” barrel?
With the factory guns and barrels it is all a roll of the dice if you want anything close to .5 MOA.
Some will make it, but dang few as a norm. Do not believe the "once in a lifetime 3 shot group one hole group" that always shows up on the internet. At BR central, they have had standing bets for a .25 factory gun to shoot in the short range BR matches and agg .25 for five shot groups and no one has won any money yet...
Interesting. I think I will pull the scope off my varmint rifle on to my 6mm Rem. The deer load I use in that rifle comes pretty close to meeting that requirement. How many 5 shot groups in a row do I have to produce? I will disclose what my un-altered factory rifle is at a later date and time...
Any funds I might win will be donated to the NRA juniors program at my club.;)