I still intend to do some more testing and fine tuning but these results are encouraging.Ĭases were only slightly sooty and I'm hoping magnum LR primers will help with this. (in March ) so the speed of sound was around 1150 fps. 098"Ĭase: IMI 7.62x39, necked down but NOT fire formed.Īll 5 shot strings were fired from a magazine, cycled properly and locked back on the last round. Data is below.Ģ0" Satern barrel, AR-15 carrier, 3.0 OZ buffer, gas port diameter. A subsonic Grendel would be equivalent to a 9mm handgun (140+gns travelling at 1,000fps).įINALLY!!! I have a sub sonic load that cycles my action. 45 but with a narrower profile which aids feeding from the magazine but does not help expansion. A typical load is 220gn travelling at 1,000fps. If you are illegally poaching or near others that do not want to be disturbed, or you are mandated not to disturb others then subsonic is a possibility.Ī subsonic Blackout is akin to a. Admittedly the first shot may not have been deadly because it was subsonic to start with. Or they panic less and slow quicker for follow-up shots. They sometimes run towards you if you miss or if the first shot is not deadly. With subsonic and a suppressor you can also confuse the game as to where the threat is. 22L Bench-rest discipline.īenefits of subsonic hunting apart from lowering the noise to yourself, others and any animals in the vicinity is that potentially more game can be taken without scaring the rest (e.g. Subsonic however can be just as accurate as supersonic, for example the. The 'cost' of subsonic is the shorter effective range and the loss of kinetic shock and temporary wound cavity if shooting flesh. Add a suppressor and you tame the two loudest of the four sounds made by a firearm. I admit I have done no research on this but first thoughts in my mind when I hear the word subsonic is queit, slow and under powered and not accurate.Īgain please excuse my ignorance on this subject, not trying to start any arguing just would like to know.Subsonic eliminates the down-range sound barrier crack that supersonic bullets make. What is the use of a subsonic load in any hunting rifle? Im going to show my ignorance and ask this question. Even if one got it to work in their AR there are enough differences between ARs that if someone tried same loads in a different AR they might or might not work. Hell we have enough problems with ARs cycling issues with full power loads discussed on here being over gassed or under gassed or other issues to go into this can of worms of getting an AR to cycle subs with the Grendel. But those slower powders leave 15 to 20% unburned powder making for a lot more cleaning necessary. Primer selection and using a fast burning rifle powder not pistol powders have helped in getting the pressures at the gas port up for them. Some have modified buffer springs for dedicated subsonic ARs to get them to cycle with their 223 Subsonics. I know the ammo manufacture that worked those up some of the issues he had along the way but with the time and effort keeps his secrets. Have seen loads that cycle 223 AR pistol and SBR but they took hundreds of rounds to get to work with different powders than your pistol powders usually used for subs and with different primers as well along with a very heavy bullet for caliber. Do not go too low and stick a bullet in the barrel or too high and create a pipe bomb at your face. When working up subs start high and work your way down and a good Chronograph is necessary. And you are correct Sir about the video showing some things that are no where detailed enough in his practices especially powder charge weights. I agree Klem, if I were to want to shoot subs in an AR I would just go with a 300BO.
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