RE: Custom Mauser Detail Questions
Man, you've got the bug.......and I understand.
The .257 Roberts is a good choice for that purpose.....deer/pronghorns..... I recently attached a #1 Douglas barrel 21" to a VZ-24 in 6.5X55 and that's fairly close in performance to the .257 Roberts.
I'd recommend either the 2 position M-70 type safety from Brownells or the Dakota 3-position M-70 style safety from Brownells. There's a big difference in price but it's your money. The three position safety will run at least $100 more than the two position safety.
The standard Timney trigger (sportsman) is a superb trigger and I'd use it without a question.
Your VZ-24 will also accommodate the 6.5-06 as well as the .280 Remington so you might want to reconsider the choice to .25-06 or one of the two listed calibers as well as the .257 Roberts. It'll also handle the .240 Weatherby without rail work or bolt face alteration....something to think about.
Best of luck with the project....send a private email and I'll help you with some of the particulars.