![]() And yes, such low fill-ratio combinations often produce very variable pressures / MVs depending on charge position, but they (a) work and (b) remain safe. There is NO flashover! What is reckoned to happen is that the primer explosion kicks the low density / large area kernels up into a veritable storm of powder kernels and super-hot primer eject material causing the charge to burn very quickly indeed (compared to a conventional rifle cartridge and load) but it still burns, ie doesn't detonate which is the key feature. They use very low fill ratios indeed and when held level (as in shooting the average revolver) the powder charge lies along the entire length of the case less than half way up the sides. If they didn't, classic revolver target loads such as the 38 Special with a 148gn LHBWC over 2.8gn Bullseye or similar would be destroying handguns all over the place. As with other pistol powders, it ignites and burns completely differently from rifle grades. Trail Boss is a pistol powder that has also proven itself as being well suited to very low pressure reduced loads in rifle cartridges. As per my RARR, the 300BLK typically has a twist rate of around 1:7” and can handle the heavier subs without issue, hence the popularity for subsonic medium game hunting in places that allow it.įor close range fox have you considered using something like a 110gr V-Max sub that will still give an equivalent ME to a 17HMR? Suitable powders to work up a load (or should that be down? ) could be TrailBoss, Lil’Gun or VV N310.įlashover / pressure wave / detonation issues are related to the use of very slow burning magnum rifle powders in large-case 'over bore capacity' cartridges such as the Weatherby Magnums. Not that they would help you with any stability issues arising from a typical. Of the big name manufacturers, Nosler produce a 220gr BT bullet that is designed to expand at subsonic velocities, but I’ve yet to see any available over here. ![]() 30 calibre 220gr (target or hunting) bullets going to achieve it? Unless you are lucky enough to have access to the 200gr+ bullets designed to expand at subsonic velocities - think Lehigh Defence and similar manufacturers’ offerings primarily for the 300AAC Blackout - then they’ll possibly pencil through, assuming they don’t hit sideways due to stability issues. ![]() If you want a clean kill then are the commonly available UK market. ![]()
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