The kernels of powder look like little Cheerios at first glance. 38 with Trail Boss and love how it works. Trail Boss (TB) was originally designed to work in cowboy action cartridges like. In this test I’ll be loading several bullet options from Hornady and I’ll be using the premier subsonic powder on the market: IMR Trail Boss Powder. The tighter twist rate enables the slow-moving bullets to gain a bit more gyroscopic stability in flight and this is a huge thing when we’re dealing with low pressures and short ranges. You are almost guaranteed a keyhole from a 1:12 bore. I’ve found that the 1:12 twist rate isn’t fast enough to stabilize most projectiles moving at subsonic speeds. 308/7.62 rifles and is in my opinion the most versatile twist rate available for any. The rifle I have has a 13.5” barrel with a 1:10 twist. In short, I’m using something that simply launches bullets in order to remove obstructions that could cause error. 308 in a bolt gun because it allows more linear testing without the variable of cycling pressure and gas bleed-off. 308 Win ammunition in a bolt action as my example as it is easily made subsonic and is a good cartridge to begin working with. 308 Win Handloadsįor this article I’ll be using.
A Bolt Action Rifle was used for shooting Subsonic. You don’t want that to happen with an expensive suppressor attached. Again, seems like a no-brainer but I’ve seen many guys load subsonic that keyhole at 100 yards or less. The projectile must be able to stabilize in subsonic flight in order to be accurate. The second thing to concern yourself is one that often escapes people: bullet stability. Granted, you may pick up or lose some speed given external variables, but fear not as there isn’t that big of a difference in performance at the effective range of most subsonic cartridges. As a result, I have found that a velocity of 1050fps at the muzzle is a nearly optimum speed for any condition range.
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