Re: 9.53 Saturn, 375-416 Rigby Imp anyone shooting them?
Durak, Norma does make Weatherby brass. The Rigby imp in 338 and 375 holds slightly more powder than the 378 case but performance is very close. The rigby imp is slightly faster on average. For me not worth all the extra effort of forming the 416 Rigby brass when you can just get a 378 wby that you probably will not notice the performance diference with. I am having good success with mine at long range. At safe operating pressures the Norma/wby brass has worked well for 60+ years to set numerous 1000 yard world records and win untold numbers of matches. It has been tested succesfully on probably millions of big game animals worldwide during that period. Amazing now new keyboard comando kids come along with limited knowledge/experience trying to tell everyone Norma/Wby brass is no good.
The Lapua brass can perform at higher pressures allowing the lapua cartridges to perform slightly better than equal case capacity cartridges. However you must look at staying within the safe operating pressures of the rifle which haven't changed for the lapua. The 338-300 RUM vs the 338 Lapua is an example where the 338 Lapua may be the best choice with 338 lapua brass. However that does not mean norma/wby brass or remington brass for the 338-300 RUM is no good. I shoot well over 150 rifles from my collection with brass and bullets from all manufactures and when shooting I can not tell a difference which brass is in the chamber. Results and performance are what matter.
The 338-378 wby and 378 wby will outperform the 338 and 375 Lapuas at reduced loads with extremely safe pressures with excellent brass life. Some try to hot load the lapuas to unsafe pressures trying to get within 100-150 fps or so of the 378 case cartridges lessening the life of the brass. I prefer to shoot safe pressures with the 378 case. I have shot norma/wby brass since the 70's at safe pressures with good success. The safe pressures still allowed me to shoot faster and outperform lesser cartridges at higher unsafe pressures.
I guess it all boils down to performance when you get that once in a lifetime chance at an animal. I want the top performance and put every odd in my favor. I have taken hundreds of trophy animals by putting every odd in my favor. All through the years as people have admired my many trophy animals not one person has ever cared what brass I shot them with. Also as I was preparing for the shot for each never once was I concerned that I was shooting worthless wby/norma brass instead of the fantasticly great supperior superperformnce lapua brass.
Predictions are difficult, especially when they involve the future