Bullet jump on a type 99

[Frameman]

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?

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[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.).

[Frameman]

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.).

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

[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.

[Frameman]

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.

Thanks for your thoughts.

[bob q]

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 .