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Rifles, Reloading, Optics, Equipment
Reloading
Erratic pressure signs on previously safe load
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<blockquote data-quote="Hugnot" data-source="post: 2309144" data-attributes="member: 115658"><p>Load data on the Barnes site with 130 Barnes TSX BT lists a max 65.4 grains of IMR4064 for 3519 fps, No pressure data was provided. The OP reports "Load clocks about 3700fps" using 1 grain less powder with a lighter bullet and different brass make.</p><p></p><p>Max pressure data on the Hodgdon site ran in the 63 K psi range with most max loads. On the Nosler site 58.5 grs. IMR 4064 provided max accuracy using 150 gr. bullets but with the warning to start low with their monolithic E Tip bullet.</p><p></p><p> The OP reported using " Norma brass, fed 215, 64.5 grains imr 4064, and a 124 hammer." All sorts of stuff may affect pressure boosting it up to the unacceptable range. Should I be in this situation I would verify the powder weight since it produces velocities about 200 fps faster than that on the Barnes site using a similar bullet. Time is running out, good results are needed. I would load 5 with 60.5 grains (Nosler's start load for 125 cup & core bullet at 3346 fps) then increase load in 1 grain increments & look for excessive pressures. I would also look for loose primer pockets in fired brass having "swipes" then check out bullet slip fit into fired brass, seating depth, brass length, and scale accuracy. The 4 grain reduction is only a 6 % reduction of powder for 5% to 10 % reduction of velocity (3519 fps - 3700 fps) and hopefully velocities some 200 fps more may be reached with good reliable ammo.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2309144, member: 115658"] Load data on the Barnes site with 130 Barnes TSX BT lists a max 65.4 grains of IMR4064 for 3519 fps, No pressure data was provided. The OP reports "Load clocks about 3700fps" using 1 grain less powder with a lighter bullet and different brass make. Max pressure data on the Hodgdon site ran in the 63 K psi range with most max loads. On the Nosler site 58.5 grs. IMR 4064 provided max accuracy using 150 gr. bullets but with the warning to start low with their monolithic E Tip bullet. The OP reported using " Norma brass, fed 215, 64.5 grains imr 4064, and a 124 hammer." All sorts of stuff may affect pressure boosting it up to the unacceptable range. Should I be in this situation I would verify the powder weight since it produces velocities about 200 fps faster than that on the Barnes site using a similar bullet. Time is running out, good results are needed. I would load 5 with 60.5 grains (Nosler's start load for 125 cup & core bullet at 3346 fps) then increase load in 1 grain increments & look for excessive pressures. I would also look for loose primer pockets in fired brass having "swipes" then check out bullet slip fit into fired brass, seating depth, brass length, and scale accuracy. The 4 grain reduction is only a 6 % reduction of powder for 5% to 10 % reduction of velocity (3519 fps - 3700 fps) and hopefully velocities some 200 fps more may be reached with good reliable ammo. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Erratic pressure signs on previously safe load
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