98Z5V

Serious?...

Muzzle velocity. The most I can drive my 300BLK 150s to is about 1800fps through a 16" barrel. It's not even enough to explode Tannerite at 100 yards. Tried it many a time, thinking that I was missing the target - only to walk down range and find that I gave the 2-liter bottle a huge leak. Went back to the firing line and shot it with the Mk12 and BOOM!... Inherent accuracy in a projectile is in the bullet construction and muzzle velocity - how many people you know can shoot MOA with a 5" 1911 at 50 yards? The projectile isn't designed for that, it's subsonic, fat, slow, and that was never what it was meant for. Muzzle velocity is your friend in accuracy testing, as long as you hit an accuracy node in the loading, and stop there, before pressure signs. You picked a real tough cartridge to pull for an accuracy-over-barrel length test, that's for sure. I don't doubt in the least that this is gonna be good, and we're all going to find out alot. But you need speed, man. Heavies and barrels designed with fast twists for heavies aren't going to be the answer, overall. That 1:7" might not be bad at all, but the 1:8" os the "overall" twist on BLK - handles all of them about as well as a twist rate can, from superlight to 220 subs. That 1:7" is more for the higher end of the weight class on these, but it still might do great with a 125gr or something. This will be good, that's for sure.

We will talk about this - you'll love it. I just converted this many pieces of .308 brass into .260 Rem, and it's getting loaded tomorrow night. Then, more... and more... I have 1.5 weeks to be drowning in .260 Rem ammo, and it's ALL gonna get shot 15~17 March... There's about 300 of them in there, already primed and ready to drop powder and projectile. You'll need one of these, but we'll get to that when the time comes, and discuss the "optional things" for it.

I like Simon, alot - this thread sealed the meal-deal...

HELL YEAH, BROTHER!!!

Doc is offering you a money-back guarantee, straight from himself, because he's the one that recommended it to you and gave you his word on it...

Oh, I said early on - I'd try to bang the socialist out of her...

Only the loads will tell...

If the 1:7" is already ordered, then up the weight on the projos, over the light-weights with muzzle velocity. If the 1:7" is already on the way, then the game has already changed, right into mid-weight projectiles, at a minimum... Like I said - you picked a winner of a cartridge to do this test on... TONS of variables!

You're not looking for pure speed, just an efficient projectile - the most efficient projectile you can find. You will be much better served with a 1:8" twist over a 1:7" twist, if you end up with that 78gr projectile. That's why I'm trying to head that 1:7" twist decision off now, before you do it. That 1:7" twist will serve you WELL in the 180~220gr selections - but those aren't what you're looking for, in the stated purpose.

Nobody likes a quitter, Neil. That's 3rd grade playground rules, right there, fucker...

That's a straight game load, an not an accuracy projectile be any means. That doesn't mean, in the least, that it's not an accuracy projectile - but it was designed for killing game animals first, with accuracy second. GMX, SST, ELD-X - those are hunting loads, not accuracy loads. Hornady HPBT, ELD-M, older A-MAX projectiles (that are being phased out) - those are accuracy projectiles. Compare BCs on what you're looking at - but select the right tool for the job that you're primarily going for, as the first option, man... https://www.hornady.com/bullets/rifle/#!/ Not to be deterred by what I've said, though, in a testament to hunting projectiles, the most accurate projectile I found for my 25/45 Sharps loads was the Sierra .25 cal GameKing, in 90gr. It smoked everything else out there, in my accuracy testing - the bonus was that thing was built as a coyote gun in the first place, and it was a hunting projectile that did the best - that cartridge is just different, as a whole. I'm happy with it. Consider your goals, first, go outside the box during testing with different projectiles - but certainly don't develop a barrel profile around a specific projectile - that specific projectile might suck for you... then it's all down the drain, all the labor, work, testing - and you'l think the caliber sucks, based on all the math beforehand... 300BLK is a SAAMI-spec chamber - don't develop some specific chamber for it, based on some prpjectile you want to use. Just have the chamber cut at the SAAMI-spec for the chamber, and run testing from there. 1:7" twist is crazy for a BLK load - that's for the heavies, the sub's, the suppressed loads primarily. 1:8" twist is what you'd be looking for, for something that you want to launch fast, as accurate. 1:8" twist will do much better than 1:7" twist, for supersonic loads. BLK is weird - and you're getting into weird here, but you do what you want. You're looking for results, though, so in the long run, you need to really look at what you're trying to do. You certainly picked the right caliber for the "max amount of options" to try this with... Initial selections that you make right now, might disappoint you down the road. Then you'll be arguing all the data here, saying none of the data is right - and I'll be that asshead pointing right back at you on your initial selections - and why it all happened. Again, my go-to on BLK is the Hornady 150gr FMJ-BT, at around 1800fps loads. It's in the middle of everything, and does quite well. If I was only accuracy-testing, it would be my round. Overall, it's badass. Since I can't "hunt" FMJ rounds in AZ, it's not my go-to as a hunting projo in BLK, I'll take the Barnes 150gr .30 cal TSX for it - the BC is slightly lower, but it's an even match, so much that I don't have to change the powder charge. I find the same thing in the Hornady 75gr loads that I make for my 5.56 rifles - HPBT projos. Accurate as all hell. For hunting those guns, I only load Barnes 70gr TSX projectiles. The lighter Barnes bullets are actually longer - and my powder charge is exactly the same, for the same accuracy, between those loads. There are some projectiles out there that are "freaks of nature." You need to find the right projectile - but off the bat, don't rely on the hunting projectiles as the ones that are gonna give you what you're initially searching for here. You picked a winner of a cartridge here, man, to do this test on. There are SO MANY variable with it, it's not even funny.

The rise is starting... it's never too late, either. Once the people speak, only the idiots ignore the people that they speak for...

Compass Lake Engineering has been making accurate ARs for a very, very long time. National Match rifles, that win. Their barrels are out of this world. Fear that work not a bit, man - it will be pure quality.

I finally found the thread on it - I didn't start it, PlaneFlyer did... Because PhotoBucket hates everybody, here's my pic that I extracted from them: I bought that right after Sandy Hook. The weekend of Sandy Hook, I ordered every part to make my own BCM Jack rifle, and this was the first full rifle that I bought after that bullshiit that went crazy, in this industry... It was insane...

It's fantastic - after that Ruger GSR, I was on the hunt for a 5.56 bolt that takes AR mags... lo and behold, Mossberg dropped the MVP, and the first ones were in 5.56. They didn't announce the .308s until later. Great guns, the MVPs. Somewhere on this board, there's a pic of my 5.56 MVP with a SureFire 60 in it. Just because... I found a couple pics of it, but I can't find the damn thread on it - you'll like it. Here's it's little brother...

Great hardware. I didn't go that route on my .308, and did the Ruger Gunsite Scout Rifle, but I liked that one so much that I did pick up the MVP Scout in 5.56 - topped it with a conventionally-mounted fixed 3x Nikon BDC scope, and it's one hell of a little light rifle.

That's good news, right there...

You can always buy a chamber reamer, and chamber them yourself. Are they already threaded for the barrel extension? How "blank" are the blanks?... Rifled blanks, only, or finished blanks, just unchambered?

Haven't tried it yet, with everything going on. The Shockwave with the pistol brace REALLY needs it.

She was there. Today, too...

You don'tneed to worry about annealing if you're converting LC 5.56 brass. That stuff is already annealed so deep, initially, that you're covered on the first several 300BLK loadings from it. Check it:

There's no roasting - that's good shooting, man. I have that brake on my 13.5", and I thought it was gonna suck, having that .308 concussion that close to the brain housing group - but it's good. Damn good. It tames that rifle better than shooting a 16" .308 bolt gun (which would rattle teeth). After initially shooting mine, I didn't even drill it, on that barrel - it's right there, with a red dot on the gun.

DAMNIT! The Ruthless call was BULLSHIIT! Herb Dean sucks! As soon as he called it, Robbie got up and said "What the FUK?!"