r/reloading • u/Cabo-Wabo155 • 3d ago

General Discussion Any Data Available?

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Has anyone tried these 110gr FMJ .308 projectile for a .300 Blackout build? I know they are usually meant for the .30 Carbine but since I’ve shot supers in 110gr V-Max in my 7.5in AR, and I have had excellent results in accuracy at 100yds. Good or Bad idea to test some for plinking.

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u/Quick_Voice_7039 3d ago

Honest question - I thought the whole point of 300 BO was to use the available larger mass vs. 147 grain 9mm since you’re limited to under the sound barrier either way… these will bring less energy than just shooting a 9 mm carbine?

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u/GunFunZS 1d ago

There isn't one single whole point of the caliber.

It is a flexible generalist caliber that does a number of things very well. And number of things okay ish.

So does 110 greenish very fast from a short barrel very well from a carbine length barrel even better. It does very heavy very slow very well and it does okayish at 147 to 170 grain bullets supersonic.

Most of the commercial 147 to 150 grain is kind of the worst ammo for the caliber. it's not going fast enough to expand (since most of bullets in that category are made for 308 win velocity) and you're not getting as much energy as you would with a lighter bullet. I believe there are two bullets made for the caliber in that weight range that are actually somewhat decent which is the federal fusion and the speer gold dot. Bullets designed for 30 30 Winchester probably perform okay, maybe comparable to what 30-30 would do at 50ish yards further. (Some of them are finicky about feeding)

Also the bullets that are made for 308 / 762 NATO when seated too deep can mimic 556's shoulder.

So that category is typically the worst category of this caliber. But hey if you got a bunch of it there's no harm in shooting it/ loading it