I have been trying to work up a load for my .338 RUM. I've gone through 3 different powders and two different weight bullets. The best combination I' ve found so far is a Barnes 210 grn ttsx being pushed by 95 grns of retumbo lit by a fed 215m gold metal primer. This load averages between 1.25 - 2.5" groups which is far less than this round is capable of. When I check the bullet seating depth on the gun I found it is 3.84" I tried to back the bullet off .05 to 3.79" . When I checked this in the gun it is nowhere near fitting into the mag well. So I loaded to the gun which is 3.68" and this is what the above listed groups were from. Checking the book Barnes recommends a COAL of 3.6 I was thinking of loading to this but that would place the bullet .24" off of the lands. So now for my questions has anyone had any luck using this much bullet jump? I'm at the point now where I feel that I'm throwing good money into a bad gun and am at the point of sending the gun out to have it rebarreled so any advice or insight will be appreciated.