Almost identical but supposedly with more flash suppressant. I use a powder that has the exact burn rate as CFE BLK and very close to Accurate 1680, its WC680. And I didn’t say it before but all loads had positive bolt lock back and zero feeding issues. I played with it until I brought it closer to the gun and started getting consistent readings.Īny advice on the subject would be appreciated. During the testing I had many Error messages throughout the day. I’m also not sure if the Caldwell G2 chronograph is 100%. And I watched it 10x, but still don’t get the feeling that it is working properly. I set it up exactly like their YouTube tutorial showed. More info: I’m using the Hornandy full length resizing die, that is supposed to be crimping. If my crimp was too light or nonexistent, would this be the reason I need 2.5-3.0 more grains of powder? I am wondering if I am not crimping enough/properly/or at all. What am I missing and what’s going on? The only thing that I can’t measure scientifically is the crimp. Does this make since to someone that has loaded 220 grain with CFE BlK? I have seen others post data of 10.5-11.5 grains CFE BLK giving them 1000-1050 FPS in an 8” barrel. So all that being said for the back story, I think these grain loads are very high. I already had 5 rounds of 14.3 grains loaded so I shot those and the avg was 1048 but the group opened up to 1.5”-2.0”. If my 308 bolt gun shot that group I would have been impressed. Here is the interesting part, it was a dime sized group at 33yds. So I added another grain to 14.1 total and got 954 FPS avg. I guesstimated that 1 grain is about 75-100 FPS and bumped up the load to 13.0 grains. So I started at 11.1 grains and got 761FPS avg. They said 11.8 grains of CFE yields 1050 and 13.4 yields 1250. So I started load development using the grain weight recommendation from Sierra since they publish for free and they have a 220 grain bullet (although not same exact shape). So that being said l, I have searched for info on forums to see what others are doing and I have found some data on 220’s with CFE. I am loading for an 8” barreled AR with a 1:8 twist. Here’s my question plus explanation for the group (and it might be long winded):Įvery load manual i have seen, seems like 16” barrel is understood barrel length for the data. I ended up starting a load using Berry’s 220 grain with CFE BLK and CCI #400 SRP. I have done a ton of research on subsonic load data.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |