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For my M1910 (9.5X57 - .375 Nitro Express Rimless), the essential thing is to have enough 'meat' toward the top 1/3 of the projectile (toward bullet tip) and to keep the overall profile close to the original MS proprietary specs.

As I'm sure you know, the bullet shape and seated depth are critical for proper feeding in the Schoenauer magazine, particularly on pre M1924 models.

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Thanks for this Rothhammer, as mentioned, the Privi do not feed well from the magazine.....but.....(as expected) the Hornady 160 grain round nose at original spec overall length feed slicker than "greased owl feces".

AS A SIDE NOTE:
I have received a further response from the firm that holds the Jeffery daybooks. The research is not completely definitive because it is said that Jeffery used serial number "blocks" that may or may not exactly coincide with production dates.
Still, that being said, rifles a few 10's of numbers either side of this serial number block of Jeffery Mannlichers indicate my rifle likely dates to Sept/Oct 1911. Thus the King Street address.

This brings me to the somewhat enigmatic "T in a circle" proof mark on the action and barrel. It signifies "Tiegelgussstahl" (crucible steel) and is said to date post WWI. However the only reference to post WWI and this mark that I can find is that it began use on Czech production guns post WWI.
I cannot find any source that mentions actual starting date of usage by Austria; however as this rifle is a Model 1903 with an action dated 1909 and is stamped with the “T in a circle” it seems clear that the mark was in use well before WWI.
- Mike