Originally Posted by lamiglas
I loaded a 200 gr accubond loosley in the case at 3.890. this was plenty to long for the magazine but I wanted to check on the freebore issue. I painted the bullet with a black sharpie and chambered the round. it didnt touch the lands and it didnt seat the bullet any further. can i assume then that it has freebore? In the past I have used the speer manual and only loaded to their "col tested at". In the speer manual it has a different max for each bullet type/weight and for the 200 grain bullet it lists 3.560. nosler information I read only gives one col not specific for bullet type/weght, and the hodgon website shows a col for the 200 gr accubond at 3.590. in addition to this info, kraky1 mentioned starting at max magazine length and going from there. kraky1, does this mean up to the point of the 3.590, or do you not worry about listed max col's? can going outside of listed col's cause pressure danger? so far the load I am working on is a 200 gr accubond, retumbo powder in 1/2 grain increments starting at 79 grains. the only left to determine is a col? any additional info on safety, accuracy etc, as it pertains to col in a freebore chamber is greatly appreciated.
Don't bother with what the manuals recommend on COL,except when a particular bullet is SHORT in length,then you will need to seat it at least ONE CALIBRE into the neck;.308".
Otherwise,just seat your bullets just shy of the end of your magazine,and you should be good to go.
Of course others will say to juggle seating depths to tune for accuracy,and rightly so,but with the 300 Weatherby,I have never found it to make much difference,it's pretty accurate as long as you 'tune' your loads for it.
You will be quite safe as long as you adhere to the loads in most MODERN manuals,freebore actually LESSENS pressure,so you can use larger 'doses' of powder,within limits of course,this is why Roy Weatherby used 'freebore',to get the highest possible velocity from his cartridges.