I am looking a deer rifle with tremendous knockdown power. Tired of deer running. Need rifle that will drop them where they stand. Also hunt elk, red stag and caribou. Largest quarry would be a kudu or gemsbok. Have had a lazzeroni warbird, but it was not consistently accurate and did not perform as advertised. Should I look at the 300 RUM, 338 Lapau, 338-378 Weatherby? Price is not a huge concern; will gladly pay for dependable performance. How about scopes...are Zeiss, svarosky, huskemow worth the money or are there cheaper models that perform equally well? Most of my shots are 400 yards or less. Thanks.