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7x64

This is a discussion on 7x64 within the Reloading forums, part of the HUNTING EQUIPMENT, FIREARMS & AMMUNITION category; Just bought a 7x64. It is my one and only rifle. Any one reloaded for a 7x64 ? IMR hodgdon ...

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    Sauer7x64 is offline New Member
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    Default 7x64

    Just bought a 7x64. It is my one and only rifle. Any one reloaded for a 7x64 ? IMR hodgdon powders non existant here at moment and are expensive anyway. Vihtavuori and Alliant reloader are the only ones I can get. Data is pretty sparse too so any data any of you have i would appreciate. Currently looking to load Hornady 139gr. Also do you load to the lands or give it a bit of jump ? if so how much?
    cheers Steve

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    Default QuickLoad Data

    It's generally recommended that we seat bullets from 0.020" to 0.070" from lands. I usually start at .030" with Hornady's, .050" with all copper pills. Seating into the lands spikes pressure, no big deal on a mild target load but could be a problem with max loads, the difference in accuracy is moot in sporting arms as we want more velocity at lower pressures as a rule.

    This is of course assuming your magazine will accept them so loaded. Many times, OAL has to be adjusted shorter from ideal because of magazine length.

    Here's a printout of powders and loads from QuickLoad, a really good loading software program. I selected loading densities from 90% to 105% (mild compression) of usable powder space, at the software-default 52667 psi max. CIP specs are 60191 psi, but please bear in mind that you should plan on reducing the listed charges and working up as various batches of powders can vary in burn and density by 10% or so. This is why the software defaults low, but given the difference of less than 100 fps between 52667 and 60000+ psi, little is to be gained running hot if the accuracy is good.

    Note on the "calculated and estimated data" section I randomly plugged-in 60 gr. Reloader 17 in order to run the report, way too hot at 67,796 psi. It absolute-maxes out at 58.0 grains for 60,498 psi and 3073 fps predicted.

    Also, fill an empty with water and weigh the water. 69 grains is standard on the 7x64, but real cases rarely come in there. Thicker cases (less volume) can raise pressures too. Same with seating depth because it affects capacity as well.

    Note it also lists the % of powder that is actually consumed in the barrel, 100% of course the ideal. This is where Alliant Reloader 17 powders really shine.

    QuickLOAD.pdf
    -----------------
    "It's all fun 'n games 'till somebody shoots a bull"

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    Tentman is offline New Member
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    Gidday Guys

    Must be a 7x64 day. I'm new to the forum and have a new to me CZ537 (which I believe is a transition model between the 602 and 550 series) in 7x64. I reload for several other calibres including 6.5-06 which is a "ballistically close relative" of the 7x64.

    However I don't have a great deal of experience with the long throats that seem to be typical for European rifles chambered for 7x64 even with bullets seated right out for full mag length I still am not close the lands.

    I would like to shoot 160 gn projectiles in this rifle, either the Speer 160 or Hornady 162 A-max. Ideally I'd like to get something like 2700 to 2800 fps from my 24 barrel.

    What do folk feel is the optimal powder type for a long throat i.e. should I start with something quite slow like H-1000 (AR 2217) or a bit quicker like R-19 or H-4350 (AR 2209) or doesn't it matter ??

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    Sauer7x64 is offline New Member
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    Quote Originally Posted by Stocky View Post
    It's generally recommended that we seat bullets from 0.020" to 0.070" from lands. I usually start at .030" with Hornady's, .050" with all copper pills. Seating into the lands spikes pressure, no big deal on a mild target load but could be a problem with max loads, the difference in accuracy is moot in sporting arms as we want more velocity at lower pressures as a rule.

    This is of course assuming your magazine will accept them so loaded. Many times, OAL has to be adjusted shorter from ideal because of magazine length.

    Here's a printout of powders and loads from QuickLoad, a really good loading software program. I selected loading densities from 90% to 105% (mild compression) of usable powder space, at the software-default 52667 psi max. CIP specs are 60191 psi, but please bear in mind that you should plan on reducing the listed charges and working up as various batches of powders can vary in burn and density by 10% or so. This is why the software defaults low, but given the difference of less than 100 fps between 52667 and 60000+ psi, little is to be gained running hot if the accuracy is good.

    Note on the "calculated and estimated data" section I randomly plugged-in 60 gr. Reloader 17 in order to run the report, way too hot at 67,796 psi. It absolute-maxes out at 58.0 grains for 60,498 psi and 3073 fps predicted.

    Also, fill an empty with water and weigh the water. 69 grains is standard on the 7x64, but real cases rarely come in there. Thicker cases (less volume) can raise pressures too. Same with seating depth because it affects capacity as well.

    Note it also lists the % of powder that is actually consumed in the barrel, 100% of course the ideal. This is where Alliant Reloader 17 powders really shine.

    QuickLOAD.pdf
    Thanks For that Stocky

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