Why not a semiauto .300 Blackout? Josh Wayner has been writing in the gun industry for five years. Getting subsonic loads to function in your rifle can be both fun and frustrating. Subsonic Handgun utilizes tried-and-true XTP® bullets that expand reliably at subsonic velocities. I loaded all rounds to feed from an Alpha Mags AICS pattern magazine. I suspect that the magnum primers allow for a more consistent powder burn due to the increased flash duration. 5 rounds just for testing. Customer Q&A are not compatible with your browser. A 30-06 because it is so flexible, I had purchased (500) 110gr .308 cal, copper-coated bullets, designated by the manufacturer as “.30 Carbine” bullets; however, they would not feed in my two USGI carbines, regardless of seating depth (wrong ogive shape). Not to waste a good day at the range, I fired the rest for data and received interesting results. I found that there was no discernible correlation between velocity and standard vs. magnum primers. But it was still pretty interesting. In addition to firearms-related work, Josh enjoys working with animals and researching conservation projects in his home state of Michigan. Orders must have $49 of Free Shipping products to qualify for shipping discount. With a rough idea in mind, I started the process with necksized Lapua Rifle Brass. I built the rifle from the PSA kit a couple years ago. How much Dacron would put in the cartridge? This isn’t an ideal optic for shooting groups from a precision rifle, but I expect that I wouldn’t have done all that much better using a magnified scope. Learn how you can enable Javascript. QuikLOAD said 1168 FPS calculated, but it has been consistently high by about 100+ FPS for low power loads. You don’t want that to happen with an expensive suppressor attached. 11.0 to 11.3 gr. BTHP are subsonic in my AR10. Hornady® Subsonic Ammunition — designed for accuracy and performance below the speed of sound — now comes in both rifle and handgun loads. I started the 180gr loads seated to the cannelure with 12, 11, and 10 grains of TB. I own both. I only wish I would have started here. If you want to use a case filler to use light loads with other powders, you can use either dacron fibre or corn flour. Over the last several years Atomic Ammunition has conducted an extensive due diligence processes to come up with proprietary loadings for rifles and self-defense pistols. For this article I’ll be using .308 Win ammunition in a bolt action as my example as it is easily made subsonic and is a good cartridge to begin working with. This information is solely for my rifle and my reloading setup. Learn how you can enable Javascript. Perfect for use with suppressors. This ammunition is loaded with Super-X Power-Points which feature a unique, exposed soft nose jacketed bullet design that delivers maximum energy on target. You can learn more about the cookies we use and why we use them by viewing our Privacy Policy. 80% polymer lower. Just my two cents. This powder is suited to .308 because it is made to take up lots of internal space inside the case. The magnum primer load in the 180gr/12gr load was substantially more accurate at 100yds than the standard LR primer variation. Since I was shooting “standard” reloads at the range, at the same time I tried (5) rounds of 110gr/12gr TrailBoss rounds, I didn’t reset the scope, and I didn’t have my chrony to measure velocity. I have used both successfully, however my preference is now to fill the case with a high density powder. ha ha, I did the same thing in a 30-06 with good results. Granted, you may pick up or lose some speed given external variables, but fear not as there isn’t that big of a difference in performance at the effective range of most subsonic cartridges. Wouldn’t the residue from the stuffing create a residue in the barrel? A the writer says without a suppressor it’s a moot point. I originally wanted to start with 13gr of TB, but I heard crunching when I seated the bullets to mag length. Is that a good idea and safe? So which one will fare better at the same speed? Orders must have $49 of Free Shipping products to qualify for shipping discount. I want to create a subsonic round for my 300WM. The only “high pressure event” that I have encountered, and had read about before it happened to me was using Blue Dot (the original Blue Dot) in temperatures below 32 degrees in a magnum handgun round. Most are familiar with the use of heavy match bullets in the .300 Blackout and rightfully so. The rifle I have has a 13.5” barrel with a 1:10 twist. This is a huge problem if you’re using TB, as it should not be compressed at all. I suspect that I could indeed get a faster and better load out of the 225 ELD if I loaded the bullet longer and added more powder in the newly freed space in the case, but that would defeat the purpose of having a magazine fed rifle.

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