Re: Oregon Trail Antelope – Part 2a
The barrel is an eight twist, 30 inches long. The load is a dumptruck full of RL22 with a velocity of about 3250 fps give or take a little. It doesn't really matter being as I always use real drops to set up my ballistics anyway. I have no chrongraph but with my methods I don't need one.
Some people cannot get the speeds I get because of bullet blowups with 8 twist barrels. I try to be very careful with the barrel and not get it hot and to keep it clean so it is not rough. I doubt that I will get a lot of barrel life from it as far as round count goes but being as I only fire it maybe 25 times a year I don't worry about round count. It will last my life time and that is all I need. I get all of my practice shooting with a 308 and leave my overbore magnums for shooting animals.
Some gunsmiths recommend a 1-10 twist barrel for cartridges such as the 6-06, 6-284, 240Wby because it is produces less jacket stress and still stabilizes the very long bullets. I would not go with a 3 groove or four groove barrel because they produce a lot of jacket stress. I would expect you can stabilize it if your barrel is smooth and doesn't blow it up.
I do not know if the 115 DTAC has been perfected yet. It had a thin jacket like the Berger and they were blowing up at about 3100 fps, so Tubbs was having them redesigned with thicker jackets. I just don't know what ever happened to the DTAC being as the Bergers do fine for me. I am not one of those people who experiment endlessly with bullets. I just find a good load and use it.
I will say another thing about the 115 Berger. I went pig hunting in Texas and decided to make a "trick" shot at 550 yards on two pigs at once. That bullet went all the way through a mature boar hog shoulders and then hit the pelvis of a mature sow and went all the way through that and exited. That's some terrific penetration given the amount of bone and tough hide it encountered.
The Smokin Fur Rifle Club