An awesome lubricant to neck up any brass is Armorall protectant. Apply sparingly with a piece of Armorall protectant wipe wrapped around a .277-284 brass brush on a section of cleaning rod. You don't even have to remove it. I have been using it for years making 358 out of 308 and 35 Whelen from 30-06. Cuts way down on neck splits. Once fired brass is all I use, buying new brass in the wrong caliber doesn't make sense to me.

Dog I rescued in January

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