I had taken the time to reinforce the hogue and felt this to be a worthwhile effort until todays range trip. I am satisfied with todays testing and feel more confident knowing the rifle will shoot I just need to locate another take off HS Precision or BC Medalist stock. It is my finding that errors in shooters form, handloading regiment, and poor equipment will magnify with subsonic loads. 300 Whisper and results have been good with both platforms. Today I changed the hogue stock with my HS that was on my 5R and tried again with the same factory Corbon and group shot a solid 3/4" 100. At 168 grains in a carbine gassed system it gets interesting without a suppressor, at 150 grains its a challenge in an 18 barrel to keep them subsonic. Carbine gas and longer barrels it takes a little playing around. Yesterday I shot a 100 yard group with factory Corbon subs with 220 SMKs and shot a 2" group. With short barrels it’s easy, suppressed you can really drop bullet weight. I have a user-serviceable silencer that I shoot a lot of 300 blackout cast. I have used diffirent powder and combos of bullets. best powder for 308 The Hodgdon Reloading Data As was said IMR 4350 is a. The XTP bullet in Subsonic Handgun has built a world-class reputation for accuracy and stopping power. I have been extremely aggravated with the performance of sub loads in my ACC-SD 300 blackout. Performance of 300 Blackout Subsonic meets or exceeds FBI Protocol terminal ballistic test requirements. Any suggestions for heavier bullet sub loads? Thanks for any help Using the same brass, Forster dies, and I have several pounds of different powders to try.
New barrel 1-8 22 inch long no taper 90* crown Old barrel 1-10 16 inch long no taper 11* crown It's about making a rifle do what I want it to. It is incumbent upon the reloader to progress in a safe manner. We have provided recommending starting charges, which should be safe in every modern, correctly manufactured, and maintained firearm of the appropriate caliber. This is not about what I will use it for or why I want to get groups smaller. With short barrels it’s easy, suppressed you can really drop bullet weight. All our loading data is intended solely for use in modern firearms. Things I have tried are giving me around 1 inch groups the best being just a bit under.
My issue is now I put a new barrel on with a faster twist to go subsonic and I am looking for advise on reaching a comparable level of accuracy with subsonic loads using heavy bullets 175-240 grains. 3-.4 with standard off the shelf bullets. 35 for five shots when using high end bullets and. I have had decent luck with supersonic loads averaging between. 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 have been working very hard with 300 blackout savage bolt gun over the last year to wring all the accuracy I can out of* this little cartridge. 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. Have loaded that bullet with that powder in 300BO, ended up at 19.5gr compressed IIRC and it runs fine, although a little slow.
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