![]() FYI I have since found the 125gr FMJ #30196 is FAR better for cheap supers in the caliber, and loaded over 20gr of CFE BLK it is decent, but CFE BLK is better suited as a subsonic powder(or with the 110gr v-max), H110/W296 is FAR better for most supers, 18gr under that 125gr bullet crimped to the cannelure is accurate and IIRC at least 100FPS faster in my 9" rifle. I would try 19, 19.5 and 20C as a max load at 2.100(crimp in cannelure), and work it up to see what works best. IMO CFE BLK is really forgiving, you would have difficulty stuffing enough in the case to get over pressure. There is published data in Hornady and Sierra for a range of bullets( Sierra pictured above) with closer OAL and about 20C-20.5C as a max charge. Problem is if you crimp to the cannelure, should be about 2.100" OAL. Hodgdon list 18.8 - 20.5C with a magnum primer and OAL of 2.235. I buy them in bulk for my 308 ARs and M1A, so was hoping I could make a "good enough" cheap super load for 300, but it kinda sucks. Īlso this, for target lighter bullets could be the answer.Have loaded that bullet with that powder in 300BO, ended up at 19.5gr compressed IIRC and it runs fine, although a little slow. Shot them testing higher gradually since they were loaded and I was 3/4 of a grainish away from pressure.īoth of these put three shoots touching, though strung in a line, at 100 in consecutive weeks so that was good enough for my hunting round testing.Īlso this, for target lighter bullets could be the answer. 02 out further before I realized that it wasn’t just my press acting up and I had too much powder. I tested a fair amount above that but it was so compressed when seating my bullet was out. 19.4 of cfeblk is right at a compressed load giving my 1999 fps but isn’t giving me any pressure signs. I wasn’t a fan of the sub Sonics for hunting so I made a supersonic round with a 150 game king. I did a primer test and the 450, br, rem 7.5 didn’t do any better than my standard 400. I have the bullets seated pretty deep in the case but it compressed. In federal American eagle brass I have found 12.1 gr of cfeblk is pretty much a max load with anymore and I notice slight pressure signs on the 220 and it coincidentally puts it right at 1050 fps which is exactly what I would want. I didn’t even knew it existed but grabbed it right there. My misfortune with 4198 led me to wander the powder aisle at cabelas and I saw cfeblk. Could have been my neck tension and I think a bunch of tension can help too. It would give serious pressure signs around 950 fps with little changes and wasn’t at all consistent. I think trying to maximize volume is important. Loading cfeblk, I figure what could be better than a powder with the cartridge in the freaking name? I have a user-serviceable silencer that I shoot a lot of 300 blackout cast. Thanks to anyone for reading, especially if you have an answer to any of my questions. best powder for 308 The Hodgdon Reloading Data As was said IMR 4350 is a. ![]() 300 BLK shooters can't due to their gas guns? Should I be trying to maximize powder volume in the case? Would a faster or slower burning powder yield more consistent MV? I've seen threads on various forums of people swearing by magnum primers for improved consistency, is there any merit to this? But a few (of the many) questions I have are Is there something that would be beneficial for me to try that most. ![]() ![]() Since I either don't need to worry about or care about any of those factors, I need to find out where to start in developing a subsonic load with the lowest variance and spread that I can.įor now, the projectile I want to push is the 230gr Berger Hybrid.įrom what I've read, most subsonic loads are running either 1680 or Lil'Gun with CCI400 Primers. Most of the information that I come across online seems to be restrictive due to most pet loads being developed with the necessity to A) Fit in an AR mag, B) Cycle an AR gas system, C) Be as quiet as possible, or D) Minimize cost per round. 300 BLK that I want to work up a consistent performing load to throw subsonics out as far as I can (repeatably). I've been entertaining myself with a little project gun lately. I come to you guys in need of some clarification and confirmation
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