Hornady 300 blackout subsonic load data11/19/2023 ![]() ![]() ![]() It turns out, after going to the SSK website, where they have lots of. All the YouTube videos I watched and articles I have read made it seem SO MUCH easier than what I was experiencing. Major frustration was beginning to set in. When I was getting a 50% failure rate chambering, I went and bought a set of RCBS small base dies, thinking the cartridges just needed to be sized smaller than the Lee dies, and then fire formed to fit my chamber.īut I was STILL getting a 50% failure rate, same problem. Every one of them appeared to be within spec. Then I checked each one in a Wilson case gauge. I bought set of Lee dies, and set about carefully reforming it. So I milled the brass down to 1.358 +- 0.001, deburred, and cleaned it. As I said, Barnes calls for 1.358 shell case length for their highly regarded 110GR Tac-TX. The SAAMI cartridge length specification calls for 1.368 +0.000 -0.020, so the lower limit would be 1.348. The brass was cut down from some once-fired PMS. I’m about at my wits end trying to figure this one out. I’ve used PCT go and no-go gauges to check headspace, as well as the Wilson case gauge, all of which checks out, and says everything SHOULD fit. ![]() all rounds seem to feed well, but fail to fully chamber and lock the bolt. A real booger to get out without breaking anything. I’ll get one or two round that feeds and chambers perfectly, and then get 4-5 that feed, but won’t chamber, and seize up hard in the chamber. Producing more failures to chamber, than not. I’ve been through two sets of dies, first the Lee dies, and the latest being the RCBS small base dies. I plan on using the Barnes 110GR Tac-TX, the Sierra 110 GR Varminter HP, the new Sierra 125 GR OTM FB Matchking, and the Sierra 220 GR Matchking for subsonic. I’ve also had major problems with failure to chamber, regardless of the bullet used or OAL.Ĭases were trimmed to 1.358, the middle of the tolerance, and that specified for the Barnes 110 GR Tac-TX, and at least one commercial re-formed case producer I’ve talked to. Pingback: Internet reloading recipes- a cautionary tale | kR-15: info and resources for firearms enthusiasts kR-15.Com neither assumes nor authorizes any person to assume for it any liability in connection with the use of any data. NOTE: Users assume all risk, responsibility and liability whatsoever for any and all injuries (including death), losses or damages to persons or property (including consequential damages), arising from the use of any data, whether or not occasioned by publisher’s negligence or based on strict liability or principles of indemnity or contribution. I run this load recipe on my Lee Precision 4-hole Turret Press and load both factory BLK brass and 5.56 brass trimmed to 300BLK specs. KB ALERT: Winchester or a similar, harder primer are the only safe ones to use in a Lee Progressive loader-be sure you use the correct type of primers with a Lee Progressive system. rI use CCI primers because they are a bit faster burning than Winchester and that’s handy for subsonic loads to help ensure you maximize ignition to help cycle the action. The bolt locks open after the last round clears.Īccurate 1680 is tough to find sometimes but the powder density matches the case capacity very nicely in the BLK. I’m using 220gr Sierra Match HPBT for the projectiles and AA1680 for powder. About 50 rounds of this recipe fired through my 16″ rifle at distances up to 200 yards to punch paper and plink. This is the recipe I use for supersonic loads for my Model 1 300 Blackout Carbine. The BLK was designed to run suppressed too- so if real quiet os your bag and you I enjoy some closer range shooting ( effective hunting range is about 100m). 5.56 ‘heavy’ projectiles weigh in at 75-80gr. That’s a mere 3.4 times heavier than common 62gr 5.56 ammo. The subsonic loads are intriguing: who wouldn’t want to send a 220gr Sierra HPBT for a big, heavy projectile to create high performance at subsonic fps. The BLK was designed to accommodate both supersonic and subsonic ammo without any tuning or performance headaches. ![]()
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