Yesterday, I finished inletting an old stock for my FN barreled action so that I could test fire it. The inletting, in itself, was a learning experience. Mistakes were made that will not be repeated when my new stock is made (ETA late April). I have a box of Norma 9.3x57 285gr Alaska SP's to shoot. Also I want to fireform some of my necked up 8x57 mauser brass.
I went into Sudbury to grab some bullets, 250gr Nolser Accubonds were all I could get. I learned today, when I made up a dummy round that my rifle has a huge lead to the rifling. I just sat the boattail of the Accubond into the neck of a 8x57 mauser brass (necked up to .365) and chambered it. It had a tight crush fit as I close the bolt, but it seems the Accubond did not touch the rifling. The C.O.L. for this configuration was 3.473", which is longer than my magazine.
For now, I just want to duplicate the pressure and velocity of the Norma factory loading until I feel comfortable with this rifle. This is what I paperwhipped to do this:
Bullet Type: 9.3mm 250gr Nolser AB SP
Bullet BC: 0.496
Case Type: 9.3x57Mauser
Full Case Capacity: 63.6gr H2O
Net Case Capacity: 53.191gr H2O
Barrel Length: 24.0"
Effective Barrel Length: 22.152"
Bullet Weight: 250gr
Bullet Length: 1.394"
Sectional Density: 0.267
Case Length: 2.240"
Overall Cartridge Length: 3.242"
Bullet Seating Depth: 0.392"
Barrel/Case Volume Ratio: 11.9
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Powder: H4895
Calculated Powder Charge: 45.7gr
Load Density: 86.0%
Charge/Bullet Weight Ratio: 0.183
Estimated Muzzle Velocity: 2072 ft/sec
Estimated Chamber Pressure: 38631 CUP
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I went into Sudbury to grab some bullets, 250gr Nolser Accubonds were all I could get. I learned today, when I made up a dummy round that my rifle has a huge lead to the rifling. I just sat the boattail of the Accubond into the neck of a 8x57 mauser brass (necked up to .365) and chambered it. It had a tight crush fit as I close the bolt, but it seems the Accubond did not touch the rifling. The C.O.L. for this configuration was 3.473", which is longer than my magazine.
For now, I just want to duplicate the pressure and velocity of the Norma factory loading until I feel comfortable with this rifle. This is what I paperwhipped to do this:
Bullet Type: 9.3mm 250gr Nolser AB SP
Bullet BC: 0.496
Case Type: 9.3x57Mauser
Full Case Capacity: 63.6gr H2O
Net Case Capacity: 53.191gr H2O
Barrel Length: 24.0"
Effective Barrel Length: 22.152"
Bullet Weight: 250gr
Bullet Length: 1.394"
Sectional Density: 0.267
Case Length: 2.240"
Overall Cartridge Length: 3.242"
Bullet Seating Depth: 0.392"
Barrel/Case Volume Ratio: 11.9
-------------------------------------------------------------------------
Powder: H4895
Calculated Powder Charge: 45.7gr
Load Density: 86.0%
Charge/Bullet Weight Ratio: 0.183
Estimated Muzzle Velocity: 2072 ft/sec
Estimated Chamber Pressure: 38631 CUP
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