I'm sure that if I went to the trouble of doing a larger sample size comparison I'd have hard data.but wtf, it's not like we're using 300BLK for 1,000m precision shots where the difference could actually have an impact. 002 and could easily have been user error), loaded 10 rounds each with COL of 2.036 & 2.038, benchrest fired the two groups for accuracy and velocity COL 2.038 to be both slightly more accurate as well as slightly more consistently stable velocity as well when I say "slightly" I mean significantly less than a single standard deviation, so while it's pretty much a meaningless difference between the two and I definitely tend to nerd out over the data (clearly), I just went with my gut and followed where the data seemed to be heading. To determine my target seating depth I measured the powder height of 20 filled cases, took the average height of the powder level (which only varied by. The subsonic 300BLK load I've had success with using Sub-X bullets is 12g CFEBLK, 190g Hornady Sub-X, COL 2.038, seated so the bullet is sitting gently on the powder without compressing it (approximately). Odds are better than average that it won't happen that way.Ĭlick to expand.Sorry for the delayed response. Opening diameter in ballistic gel tested to. If you can figure out how to make quiet subsonic 180 grain or under ammo you will become famous because not many people have figured out how to do that (and it's not from a lack of trying).īasically put the idea of running the same bullet in each rifle to bed. This is our 195 grain premium expanding hunting bullet for the 300 Blackout or any Subsonic 30 Caliber application. Pretty much unless you are shooting a bolt action rifle your bullets all need to be 190 grains or more to get reliable subsonic ammo. I've tried several slow powders and it had the same result every time. It won't be hearing safe at the ear at all. Basically that powder and how it creates pressure is relatively slow, and with almost any slow powder, the bolt will open while everything is still under pressure and the port pop will be LOUD. You CAN use a powder like Reloader 7 to get subsonic loads for all types of light bullets but the characteristics of the powder make it really loud. Since you said you are kind of a newer reloader let me know if you understand what powder shift is. You will basically cut back to the point that you get powder shift problems or cycling issues. This is another option if you don’t have a pistol length gas system in your barrel or do not want to cut a few coils off your carbine spring. Even then 190's are harder to develop a load for because they are a bit more picky when it comes to using the right powder. A 300 Blackout AR with 16 carbin length gas system will run using a Nemo Arms 300BLK light spring and a regular carbine buffer. There are a whole host of issues when you try to go lighter than 190. Given we are talking about jacketed bullets here. In an AR it's a lot more complicated to try and get subsonic performance out of anything under 190 grains.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |