Re: FREEBORE ON WEATHERBYS
I own a Sako 75 chambered in .300 Weatherby. It has the freebore, but apparently it's not a detriment to accuracy, because this is the most accurate rifle I own ( All my rifles are bedded, but other than that I don't own any custom jobs). I've tried various seating depths and have achieved the best accuracy with bullets seated deeper rather than shallower. When I seat bullets out as far as the magazine will allow, accuracy gets a little worse, but more importantly, I start noticing some signs of increased pressure when using maximum loads.
The statement regarding flat based bullets being more accurate in the .300 Wby seems to be true for my particular rifle. I recall one day shooting 6 three shot groups using the 180 grain Speer Grand Slam, which is a flat based bullet, atop some IMR 7828. Maybe I was just having a great day, but all six groups measured less than 1/2". The very first group made one hole that measured about .15" as I recall.
You're simply going to have to shoot that rifle with various loads to see if it's capable of good accuracy. But one things for sure, freebore does not automatically guarantee less accuracy.