Makita - nice saw. My choice as well.I will bring regular target 45ACP as well, but I was thinking that the rounds would embed in the wood block rather than explode it. We will see!
I'm going to try it tomorrow because I'm curious. I Googled the dimensions of a 5 gallon bucket and looks like 10.3" at the base so an 8" tall 4x4 won't topple, it'll slide. Since it'll only be sitting on a fairly slippery bucket at two small points of contact like rails if you hit pretty close to the middle of the block or just under middle it should slide through.
EDIT: made a Home Depot run....
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For those of you who wonder what 8” 4x4 looks like in a 5 gallon bucket mouth.
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@OdinIII looking at it, I might use my Limited TSO with the Syntech 40SW 205gr going 860fps.
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The perfect cartridge for this would be the 480 Ruger with a 405 grain WFN doing maybe 900 fps. I've needed an excuse to buy an Alaskan and this might be it!!