If the rounds aren't chambering properly there is a problem with the chamber. If it were me I would stick the reamer on a comparator and see whats up with it. Then cerrosafe the chamber and measure the casting. The proof is in the measuring and micrometers never ever lie. IMO they should have sent out a new barrel to you already.
NEA .300 Blackout feedback/reviews
- Thread starter ghost271
- Start date
Round nose? Why?
I did get those Hornady 110gr FMJ's with the rounded nose to cycle but I'll never buy them again, they just aren't ideal for feeding in a semi auto with the style of feed ramps an AR has.
Try Hornady 110gr V-max, 125gr SST's (just tested some today with some Nosler 125gr Ballistic Tip's), 155 A-max, 165 SST's, 168gr BTHP, you get the "point" by now. Load some bullets that look like they should be fed into an AR then once you have some rounds downrange and you figure out which powders work for your rifle then start getting creative with your projectiles and see what works.
The 300BLK can shoot a wide range of projectiles but you'd be better off to go with components known to work then trying the weird stuff once you have your powders and powder charges for a given weight figured out.
Round nose because I'm a cheap bugger and if I can't get decent results with cast, a 10cent bullet is the only other option beyond rebarreling it .223
I can't justify hunting or match bullets in a casual range toy.
Though I do have my doubts about the RN functioning properly...
The AAC was an experiment. I'm a bit of a cartridge junky. If I find a round that I like the look of, I look for a gun to wrap around it.
You seem unclear on how the ogive relates to OAL ..... ie it doesn't. Why on earth would you attempt to load a RN to any published OAL? No sh@t that didn't work.
OAL is a pointless and worthless measurement and should be summarily ignored. The only things that make any difference in a semi auto are the magazine internal length and the distance to the lands. In your case, the loaded length where the ogive meets the lands is the issue. With a RN bullet the ogive will be very near the tip of the bullet and so you will have to seat it very deep in order to clear the lands.
Round nose because I'm a cheap bugger and if I can't get decent results with cast, a 10cent bullet is the only other option beyond rebarreling it .223
I can't justify hunting or match bullets in a casual range toy.
Though I do have my doubts about the RN functioning properly...
The AAC was an experiment. I'm a bit of a cartridge junky. If I find a round that I like the look of, I look for a gun to wrap around it.
Sounds like you need a bolt action 300BLK if you want to load bullets like that. Have a look at the feed ramps on an AR and ask yourself what those are going to do to a lead bullet as it rides up the ramp. Will deforming your bullet tip on the ramp lead to a decrease in accuracy? Probably.
Lads, I been doing this reloading thing for a few years now and I'll make a few points.
1. The published data was for a RN 110 for a gun with a mid length gas system. Pretty sure that means AR
given that the nose profile on mine might be different, so it sets in deeper. Testing a few dummy rounds show that they should chamber properly, though I doubt that they will completely reliably.
2 my spitzers don't deform on chambering. They're hard cast. And even if they did, a bonked nose on a 230gr bullet isn't going to cause that sort of patterning at a mere 50m that I've seen.
Heading out in the morning to try a new batch. If there's no joy then a new methodology is needed for the future.
I don't think a bolt rifle in .300AAC would interest me. I've .308 and 7.62x54R rifles for that itch.
1. The published data was for a RN 110 for a gun with a mid length gas system. Pretty sure that means AR
given that the nose profile on mine might be different, so it sets in deeper. Testing a few dummy rounds show that they should chamber properly, though I doubt that they will completely reliably.
2 my spitzers don't deform on chambering. They're hard cast. And even if they did, a bonked nose on a 230gr bullet isn't going to cause that sort of patterning at a mere 50m that I've seen.
Heading out in the morning to try a new batch. If there's no joy then a new methodology is needed for the future.
I don't think a bolt rifle in .300AAC would interest me. I've .308 and 7.62x54R rifles for that itch.
Don't rule it out so quickly. A bolt action 300BLK running subsonic heavy bullets can be pretty quiet and accurate. If you want to shoot heavy weird bullets and use powders not commonly used in semi auto 300BLK rifles then a bolt action might be a better option for you.
I suggest you find some A1680 and try your big cast bullets again. I've loaded from 155gr-208gr with that powder with good results.
Got my 300BLK barrel back from NEA. Got one of the new black finish versions with the NEA 300BLK laser/roll markings. Not sure if these are reamed with the new Mason reamers or with the original PTG reamers but my reloads drop in and out without any problems now. Finish on the new barrels look top notch and they chamfered the gas port too. Looking forward to installing this puppy and sending some lead down range to see how she performs.
I didn't have time to clean off the grease/oils off the barrels as yet so the finish looks mottled in the iphone pic:
I didn't have time to clean off the grease/oils off the barrels as yet so the finish looks mottled in the iphone pic:
From what I've read, it helps in case of misaligned gas block installation and removes and burrs that might be there after drilling the hole. According to a Red Jacket episode, help with gas expansion, take that with a grain of salt. lol
Got my 300BLK barrel back from NEA. Got one of the new black finish versions with the NEA 300BLK laser/roll markings. Not sure if these are reamed with the new Mason reamers or with the original PTG reamers but my reloads drop in and out without any problems now. Finish on the new barrels look top notch and they chamfered the gas port too. Looking forward to installing this puppy and sending some lead down range to see how she performs.
I didn't have time to clean off the grease/oils off the barrels as yet so the finish looks mottled in the iphone pic:
Didn't I tell you the problem was the chamber?.
