BA bullet size 40 70 SS
Posted: Tue Mar 05, 2019 10:16 am
I've just cast the first bullets from my BA 409400M4 mold. I had it cut with the 3 reduced front bands and then the rear cut to .408, not .409 as advertised on line. They are great for custom molds. four weeks and it's here. I cast 1/16 for the groove bullet.
I ran them through a .408 sizing die, SPG, it works fine. lubes the groves without sizing, nice and neat.
I then loaded my JBA 40 70 SS cases with the 67 grains. ( I'm going to 2f instead of 1 1/2 OE)
I found that to seat the bullet in the correct spot, I used 63 grains. with 67 I have to push them in the lands and the bullet shows the marks.
Shiloh Sharps 74, 40 70SS 400/408 diameters.
one plastic wad and two newspaper wads over that.
slight compression. about 1/16 .
slight tweak with the factory crimp die and they slide into the chamber with a very slight push.
They seat just short of the lands.
FYI for you guys thinking about this mold.
I'll post the results when I can go to the range.
Ken
I ran them through a .408 sizing die, SPG, it works fine. lubes the groves without sizing, nice and neat.
I then loaded my JBA 40 70 SS cases with the 67 grains. ( I'm going to 2f instead of 1 1/2 OE)
I found that to seat the bullet in the correct spot, I used 63 grains. with 67 I have to push them in the lands and the bullet shows the marks.
Shiloh Sharps 74, 40 70SS 400/408 diameters.
one plastic wad and two newspaper wads over that.
slight compression. about 1/16 .
slight tweak with the factory crimp die and they slide into the chamber with a very slight push.
They seat just short of the lands.
FYI for you guys thinking about this mold.
I'll post the results when I can go to the range.
Ken