Bullet jump on a type 99

Can anyone answer this question?
What bullet jump measurement would be acceptable when reloading and seating bullets for the Arisaka type 99 in 7.7?

Assuming you're talking about off-the-lands stuff, there is no such measurement. Every rifle chamber is slightly different and every one of 'em prefers a different distance off-the-lands. All of the off-the-lands fiddling is 100% unnecessary as it's a load tweaking technique done after one has worked up the load. If you feel like doing it because it's 100% trial and error too. Highly unlikely it'll make any difference with a Japanese battle rifle anyway.
Best to load to the Max OAL given in your manual. 3.130" with a .311" 174 grain bullet(Hornady makes 'em.).

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Originally Posted by Sunray

Assuming you're talking about off-the-lands stuff, there is no such measurement. Every rifle chamber is slightly different and every one of 'em prefers a different distance off-the-lands. All of the off-the-lands fiddling is 100% unnecessary as it's a load tweaking technique done after one has worked up the load. If you feel like doing it because it's 100% trial and error too. Highly unlikely it'll make any difference with a Japanese battle rifle anyway.


Best to load to the Max OAL given in your manual. 3.130" with a .311" 174 grain bullet(Hornady makes 'em.).

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I thought this was the case. The only time it might be important could be with a new barrel with 0 throat erosion.
Thanks for your help

Hi. Doesn't matter with a BNIB barrel either. Even a new barrel will have a chamber that's slightly different from another new barrel. Has mostly to do with the wee bit of wear the tooling gets every time it's used.
The off-the-lands stuff is a thing you can do if you feel like it when you feel like it. The Max OAL works every time.

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Originally Posted by Sunray

Hi. Doesn't matter with a BNIB barrel either. Even a new barrel will have a chamber that's slightly different from another new barrel. Has mostly to do with the wee bit of wear the tooling gets every time it's used.
The off-the-lands stuff is a thing you can do if you feel like it when you feel like it. The Max OAL works every time.

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Thanks for your thoughts.

With a rifle with a good bore the best bullet you are going to get is the Hornady .312 150 sp . Load it with the whole crimp groove above the neck . That is as long as you can do and keep enough bullet in the case neck to keep it straight . If you have a extra large bore the Hornady .312 174 rn bullet will help , loaded as the 150 . The Hornady .311 174 boattail will be a poor performer no matter how you load it .