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My good friend has a 30-378 as well and he uses the 210 bergers and loves em
I am using Berger bullets right now actually. I shoot the 210 grain in my 300 RUM. I would highly recommend that if you are shooting long distance you go with the 210 and not the 185.. the 185 is still good, however the 210 has a higher Ballistic coefficient, hence more accuracy at long range and in a 300-378.. that sucker will be cooking.One thing to consider though.. for the weatherby cartidge, Bergers can be a hit or miss as far as accuracy. Because of the neck of the bullet and most importantly because this bullet needs to be seated just right it can be tough to get good groups. The freeboar of the weatherby also plays into this somewhat. Secant ogive bullets are sometimes tough with the weatherbys, it was in my 300 weatherby anyway. as far as knock down power.. they are extremly unique in that they have a delayed expansion. Meaning they will penetrate most animals 2-3 inches and then fragment causing massive wound cavities as opposed to a ballistic tip that fragments on impact and copper bullets that will go strait through. Thats what makes this such a great bullet at long range because it acts the same at almost any velocity it hits the animal. I shot 2 shots at 100yrds. and were 3/16 th apart, then I went to 200 yrds. and shot 2 that were 1 1/4 apart and the 3rd. being 5-6 " high. I have worked with different loads and a lot of different depth settings but I seem to not be able to get consistent acurracy.I am not sure what to do know. Thanks for the info