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Thank you all for your help, this information will prove very helpful for me in the coming months when I will start experimenting with the big 375. neck sizing only sounds like a very good idea with this belted magnum, as does checking length after every firing.

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As for loads, right now I have only one suitable powder for it, that's Lovex S070. Since pretty much every shooting range is closed due to the annoying pandemic right now I will send the loads to the proof house instead and let them analyze pressure, speed and consistency of my reloads.

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My first handloaded .375s. I chose an OAL of 3.527 - at 3.543 the projectiles start to kiss the lands. I cycled them a couple times to check feeding.

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As above I keep my cartridges for big bores and dangerous game well off the lands for reliability over range accuracy. My cartridges are very accurate anyway. My .375 Whitworth M98 is a standard length action so to get the cartridges to feed into the magazine they have to be shorter anyway. No problems with accuracy at all. One-third to one-half MOA, 3 shot groups.

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John aka NitroX

...
Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"

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