243 Winchester shooting 100-grain bullets. Proper twist rate for subsonic velocities was really evident from the poor results with the. According to the “Sierra Bullets Infinity” ballistics program, the 55-grain bullets at a velocity of 1,000 fps require a rifling twist of at least 10.82-1 to stabilize, so the spin imparted to them by my Savage’s 9-inch twist was enough however, the spin from a regular one-in-12-inch twist of a. That indicates these 55-grain bullets are at the ragged edge of stability fired from my Savage’s one-in- 9-inch twist barrel. 50 inch at 100 yards when they are shot at a regular velocity of 3,200 fps with a maximum amount of Benchmark powder. Five of these Sierra bullets, however, will land in. Bullets with velocities close to 1,000 fps, though, made a fairly tight group, under an inch, at 50 yards. One bullet with a low velocity of 951 fps hit about 2 inches below others of normal velocity, and one bullet with a high velocity of 1,118 fps hit about the same amount high. The granules, it takes up a lot of space for itsĮxtreme velocity spread was quite high with Sierra 55-grain bullets shot from the. Term, is fluffy, and with a hole in the middle of Trail Boss powder, for a lack of a better Recoil barely bumped the scope’s crosshairs off the aiming circle.
#Reloading subsonic 223 ammo crack
223 was a bit easier on my ears, because it lacked the crack of the shock wave of a supersonic bullet. The report was not much louder than high-velocity. The lack of noise was the first thing I noticed shooting Trail Boss in the. I pretty much used the minimum charge weights for my five rifle cartridges to keep bullet velocities below 1,100 fps. The Hodgdon Powder website () lists Trail Boss loads for rifle cartridges. That works as a safety factor, too, because it would be next to impossible to load a double charge of Trail Boss. 243’s powder capacity and about 75 percent of the. 243 Winchester takes up about 60 percent of the. For instance, a minimum charge of Trail Boss for the. The powder also works well to produce slow velocities in rifle cartridges because its circular kernels with a hole in the middle are fluffy, and a charge occupies a good portion of a powder capacity in a rifle case. The powder was designed primarily for handgun cartridges shooting lead bullets at low velocity. IMR’s Trail Boss is the only powder I’ve found that works to achieve subsonic velocities in a variety of rifle cartridges. Loading heavy bullets with these powders, and a few others, lowers velocities even more, but then there’s the matter of suitable rifling twist to stabilize such heavy, long bullets at subsonic speed. Light amounts of relatively fast burning powders intended primarily for handgun cartridges, like 2400, Unique and Red Dot, come close but do not quite generate that velocity level. Powders suitable to attain such a slow velocity are very limited in cartridges such as the. For the sake of argument, let’s say 1,100 fps is the speed of sound, and any bullet flying slower than that is considered subsonic.
So I started a search for subsonic loads for a few of my centerfire rifles to see if there was any substance to bullets at subsonic speeds.
The advantages of such loads, the posters type, are low noise and an absence of recoil, and I’m all for that. There has been a lot of chatter on Internet sites lately about centerfire loads that fire bullets at subsonic velocities. These loads and others were shot with Trail Boss powder in an attempt toĭevelop subsonic velocities (left to right). Author: John Haviland / Wolfe Publishing Co.
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