I have a .300 US made Mark V. Accumark model.

Excellent rifle. The trigger is superb.

It shoots very well, and I can understand why this was the best selling Weatherby cartridge...

But... the only thing that makes it shootable is the muzzle brake.

Do that. Have one put on. It tames it down to about the same as an unbraked '06.

My rifle shoots Hornady Custom better than anything I've loaded for it, the only rifle I've not been able to load more accurate cartridges for.

Hornady Custom is excellent ammunition.

"The price of good shotgunnery is constant practice" - Fred Kimble