The subsonic round uses 50 bmg bullets for jacketed projectiles.and that is what originally got my attention, along with the availability of pulled surplus bullets for cheap. I am using a Savage Axis action for the build and I need input on the proper twist rate to use for cast boolits. It will be chambered in 50 Hushpuppy (.510 cal bullet in a 7 wsm case cut at the shoulder). I need some input from the cast boolit experts on a rifle I am getting ready to build. When I prove the bullet out you will see it on Detroit ammo, hopefully within a month.Not sure which forum this fits in.but this started life as a factory rifle so here goes. I’m excited about testing that for expansion in water jugs. That being said I just ordered a new die this week that will cast a 390 grain hollow point which is. The bullet BHN is 15 so I suspect if you hit bone it would open up to a degree. Although firing into a dirt bank the bullet does expand to approximately. I have fired the bullets into sand bags at 50 yards and expansion varies from little to none. The bullet entered behind the right shoulder and exited out the base of the neck. It trotted another 20 to 30 feet and dropped, end of story. When I fired ( with a suppressor on the gun) I heard the impact but the deer did not really respond like I thought it would. It was a large doe quartering away from me at 70 yards at a slow trot. ![]() ![]() Joshua, I have only killed one white tail with our 400 grain subsonic ammo. This ammunition is loaded on state of the art automated loading equipment by HSM Munitions of Stevensville, Montana then hand inspected to maximize quality control. Once the best load was determined we extended our shooting in 50 yard intervals, up to 200 yards, checking for bullet stability as the target’s distance increased. Most testing for accuracy was done at 50 yards to minimize shooter error. Our primary test platforms were the Ruger 77/44 rifle with a 1:20 twist, and a Winchester lever action model 94AE with a 1:26 twist rate. We worked our way through numerous powder, primer, and projectile combinations in order to achieve the best accuracy and shot-to-shot velocity consistency, all the while pressure testing each and every combination to assure safe chamber pressures. Here are some of the targets we generated during our year-long testing. Last but not least you get your moneys worth with 888 foot pounds at the muzzle (1000fps with an 18” barrel), 1 to 1 ¼ MOA accuracy and an honest 200 yard effective range. This subsonic cartridge has been extensively tested for safe chamber pressures, consistent shot to shot velocities and exceptional accuracy out of numerous factory rifles and revolvers. The 400 grain hard cast and coated Long Wide Nose flat point was developed specifically for our loading through trial and error. 44 magnum subsonic ammo took several years and many thousands of rounds fired. Either way that leaves you with a fairly anemic 432 to 533 foot pounds of energy at the muzzle. 44 magnum load with an off-the-shelf projectile weight of generally around 240 grains. 44 special cartridge which can be fired in firearms chambered in. The current commercially available subsonic. Subsonic suppressed shooting has gained great popularity in recent years for use in the field, at the range, or in self defense. ![]() 44 Magnum 400 grain subsonic ammunition and projectile for comparison.
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