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There is an option to bushing firing pins and offsetting liners. I chose to sleeve a pair of .22 barrels into the monoblock that I created from the .410 barrels, chamber for .22 Hornet, and load 50 grain cast bullets, driven at 1500 fps. The result is rimfire pressures, no need to offset the bore or the pins, etc. Also, a flat-nose cast bullet hits MUCH harder than a regular .22 rimfire.
No need to shoot the Hornet slow,unless you just want to. The mono blocked 410 can take full house loads in the 22 Hornet, or the 22 K-Hornet, 218 BEE! 25-20 Win would be an option as well.
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Re: Largest caliber for sleved 410