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.458 SOCOM: 138.3 dB
.45-70 GOV: 140.6 dB
That is really loud. Even for supersonic rounds. That's going to give you a ring and twang in your ears. Better than a full power shot, but still.
I have zero problems with silencerco, but, I have to say I do not think the hybrid route that they and others are taking is very good for the consumer. The consumer gets one can for multi-cal, but also very poor overall performance and a substantial amount of extra weight. Then spend a TON of money on adapters and accessories. (Profit model)
I agree that dedicated cans to dedicated weapons or at least calibers is the best way to go.
Some situations are still OK, such as 300BLK subsonic in some 9mm and .45 suppressors. Or as just stated above, some 7.62 suppressors on 5.56 guns. (Less backpressure and blast baffle erosion, but greater weight and length for the same sound reduction.)
Generally with any bore hole larger than the caliber, the performance suffering comes from the intensive gas blow by and constant O2 refill. There are some companies that are offering caliber sized endcaps to help fight this issue. Its not a one size fits all solution. (I am not sold on the BATFE liking the extra endcaps thing for long either. eg: what happens when you have extra "suppressor parts" laying around.)
If you are looking for a .45 suppressor, from my personal experience I would recommend the Ocatane .45, the Rugged Obsidian, or Dead Air. Those currently are the highest performing .45 cans that I am aware of.
However, SIG, YHM, Gemtech, Liberty, Thompson, Alpha Dog, Griffen, will all get it done too, just some cases a touch louder, or heavier, or longer/shorter/ ext. Really depends on what you want at the end of the day. For example, Alpha dog has pretty good performance, but with a rail on their can. Which is pretty interesting and useful to some folks. However the trade is, they recommend operating their suppressor wet to get best performance.
If you want a .458 or 45-70 can have some of the well known shops build you one for what specific weapon you want to put it on. At least then you can expect to be well below 139Db. I can point you to several shops if your considering that.
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