9/8/2023 0 Comments 300 blackout hornady subsonic![]() ![]() Load data is available from both Sierra and Hornady for 190 grain bullets, so you don't need to feel like your off in the weeds somewhere. Finding the high end of working velocity is more important than highest actual velocity. Jacket separation is common, expanding solids like Lehigh shear the petals. It may perform too well at higher speeds, expand too much, too fast, and have too little penetration. I would not shoot it suppressed until you know. Push it to 1500 FPS (1.5 x design velocity) with a compromised jacket and it may come apart. You might actually deform the jacket or start expansion, before you see a mark on the bullet from the seating stem. ![]() It's a hollow point designed to expand under low pressure. That in itself is not a big deal, 1680 behaves very well compressed and is predictable. Make sure you find that length.Īt 2.170" you will start compressing powder around 16.5 to 17 grains, probably a grain less at factory length. Overall length will be limited to about 2.160-2.170", depending on your brass and chamber. Your thought process is sound, there are a couple of cartridge/bullet issues to consider. I think there is potential here for a very good combination. My main supersonic goal is the see what kind of velocities I can obtain with the 190 gr and 1680 combo and see what kind of projectile expansion we can get a higher than subsonic speeds. May never see 19 grs, may even not see 18 but I wanted to include it instead of wishing I would have later. With the ladder approach, using 1680 which seems to be very forgiving regarding pressure, I will approach it with caution. I came up with my supersonic ladder load based on loads for 180 to 208 gr projectiles. There is no load data available yet but I thought i would take look at it and see what I find. As we know running this projectile supersonic is a new adventure. My goal is 1700 fps, but I would be just as happy at 1500 if that is all I can get. What got me interested in running this projectile supersonic was a youtube video of a guy shooting the 190 sub-x out of a 308 into gel and it looked very impressive. It is very finicky and requires a lot of precision and paying attention to detail so hopefully I can leverage that experience to have a safe and rewarding 300 blk expericence. I have a lot of reloading experience with the 6.5 Grendel. Compression will play a role in my decisions of powder charge I will include in my ladder. With the supersonic, I just received my 190 Sub-x last night but do plan on seeing where they touch the lands as well as see what max grains of powder is relative to seating depth. Regarding coal, my current plan is to duplicate hornady factory, 2.068 with the subsonic. Thanks for all of the feedback and suggestions. Please provide feedback and any recommendations you may have that will help me get a good start on this adventure. I have been reloading for sometime now but still have concerns due to lack of knowledge around the 300 blk reloading. Very concerned with this but will approach it with caution. Supersonic starting at 16 grs and ending at 19.15 grains in. This should get me within the ballpark of my goal which is 1100 ft per second. This is what I was thinking for my 10 shot ladder test using 1680 Being new to 300 blk loading I figured I would get some direction from the experts. I need to put a plan together for a ladder test for both Subsonic and Supersonic. In looking at powders, I purchased Accurate 1680 since it seems to good reviews and cycles even at subsonic levels. My plans for this 10.5 inch is hog hunting and plinking subsonic with supersonic being for more longer range hunting, possibly deer, who knows. The barrel only had 10 shots thru the barrel using 220 Remington subsonic before this so I was very pleased.Įnded up purchasing 500 of these projectiles for reloading. I recently purchased a 10.5" upper and wanted to run subsonic with it, supressed so I picked up a couple of boxes of the hornady sub-x. My question is centered around the Hornady 190 gr Sub-x. I am new to this forum but not new to the 300 blackout. ![]()
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