300blk is really pretty good about subsonic loads working much more consistently than something like. There's also the debate about whether it's even a real thing, it's never been reproduced in a laboratory so it could just be an excuse for people double charging cases and not noticing.īut again. There's also the problem of "secondary explosive effect" but you're not likely to see that with. Even worse, those are the most dangerous types of squibs as they're nowhere near as obvious as a primer-only no-powder squib, and there's a good chance you'll go and fire the next round and blow your gun up. The problem is that the charge weights are so small that if you were to reduce too much to "safely work up" you could be right on the edge of not having enough power to even clear your barrel and end up with a squib. I'm pretty damn sure if I went another tenth or two lower and I'd be getting bullets stuck.
223 using a few different powders, and one of those would lose like 200-300 fps if I went a tenth or two under. For instance, they have load data for subsonic 55gr. 300blk being the way it is, but if you ever come across other weird loads that only list a maximum on Hodgdons website be very careful about reducing. It's not really an issue for the load you're talking about thanks to. Usually for these reduced loads you want to start AT the max and then work up/down depending on your desired speed, barrel length, actual observed performance/etc. They only list a "max load" because it's a subsonic load that comes nowhere near maximum pressures.
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