CB Load for 7.7 Jap

[mac1911]

SR4759 has been discontinued, which is why I said, "if you have it..." I have found Alliant 300MP to be a suitable substitute in most respects. It does not have the case filling bulk of SR4759 but you can use SR4759 data to start with. As usual, start low and work up.

powder selection is not very good locally so I need to wait until enough people want to go in on a group buy to make ordering worth while.

[mac1911]

powder selection is not very good locally so I need to wait until enough people want to go in on a group buy to make ordering worth while.

bulkiest powder I have on hand is Trailboss

[TCLouis]

A fellow shooter laughed at me and said, "What will you ever do with 12 pounds of 4759?".

"Shoot it behind cast BOOLITS I said smugly."

21.5 grains is also my BEST load in 8X57 (175 gr. RNFP GC GB) and I am certainly going to run it through the Type 99s to see what they will do.

I will say that 18.0 of 10B101 behind a RCBS or Ranch Dog was a fantastic performer at 50.

Have not got around to trying it at 100 . . . YET

Hah

[oldblinddog]

A fellow shooter laughed at me and said, "What would I ever do with 12 pounds of 4759?".

"Shoot it behind cast BOOLITS I said smugly."

21.5 grains is also my BEST load in 8X57 (175 gr. RNFP GC GB) and I am certainly going to run it through the Type 99s to see what they will do.

I have 7 lbs of SR 4759 and 9 lbs of 300MP. In the .308 Win a Lyman 314299 sized to 0.311" over 21.5 grs of 4759 is about perfect. 22.5 grs of 300MP with the same bullet will shoot a group that is indistinguishable. Think of 300MP as 4759 that will meter.

[mac1911]

I will be getting back to the arisaka this week.
A little more testing with H 4895.
25 grains gave me 3moa(shot at 100 yards) so I'm trying 26 and 27 to see if there are any changes. I'm trying to avoid heavier recoil. Although not harsh I was surprised by the 25 grain loads recoil.
I also was able to get the front sight to drift. I have had it soaking in Kroil for several days. I needed about 3" correction to center my group up.

[mac1911]

I am getting excited to try the type 99 at local CMP vintage military match.
The best load tested was
314299 with COWW+2% tin water quenched. They drop at .314ish
Run them through a .314" push through sizer to seat gas checks.
2500 pan lube.
25 grains H4895
PPU 7.7 brass
Wolf LR
Gave the best average groups of 3moa
Velocity was a touch over 1500fps.
Point of aim point of impact at 100 yards required rear sight set to 300m
Im,thinking 650-700m should get me close to the black at 200 yards.

[armprairie]

Well, how did you do?