Judging from your selections of trophy's you must have gone on a plains game trip in Namibia with the Dutchmen. There should be lots more animals as they are/were quite diverse and fairly abundant.
I will attempt to respond to your inquiry However it is difficult to do so as it is important to use the proper nomenclature and you did not provide enough detail to run your query though google, quickload or Auto Cad.
My family descends from an 8th century Bavarian encounter of a few minutes duration between a dairy maid and a group of nomadic sheepherders or it could have been between a sheepherder and a group of dairy maids. I am not one hundred percent clear on which as my attempts to search for "sheepherders + brief sexual encounter" keeps getting blocked by parental controls.
Also, its important to specify which .257 roberts you are asking about. Although they use the same size case head the .257 Roberts, .257 Remington Roberts, .257-7mmx57, .257-9.3x57, .257-6mm Remington all show different velocity results in quick load depending on the powder choice and barrel length. You did not specify which powder you were asking about so I assumed that you were using Unique. Which leads us to another inquiry of which version of Unique as loads developed using the vintage 1920's Unique which I bought at a garage sale in a plastic one pound container with unquestioned provenance to Elmer Keith as it had the letter "E" written on it in pencil, which I subsequently used to dispatch a charging hare, would be vastly different from the data quickload provides for one of the various Weatherby cartridges.
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