Then don't use brass!

Steel works as russian ammo shows but it comes with issues like not flexing, shrinking once fired, leading to cases more or less stuck in the chamber. The new 6.8 case uses a two part steel head brass cylinder front mechanically locked together to get around the high pressure steel case problem. But it's not an easy or inexpensive fix. And the new 6.8 rifle is showing some teething issues in the field now.

Caseless or telescoping may be a thing but you still have the whole how to seal the pressure vessel that brass currently does. The brass case is essentially a gasket on a piston head.

That portable power thing is the hold up on the electromagnetic propulsion guns. That tech has already shown the potential to surpass conventional powder driven velocities.

I think the main reason for not higher velocities is it gains u so little for the troubles it brings. Though there are people working on it. Just look at the calibers u mentioned, they haven't exactly caught on despite their speed.

I have a Savage 110ML that uses smokeless powder in a muzzleloader. No case. Approaching 375 H&H ballistics.

Imo it gets to the point where there just not much point in higher velocity. Can get my 17-5.56 kak up to 5k with a 15.5 GR bullet but why ? Lower brass life , lower barrel life ect.

The ELR and UELR guys are doing. Some really cool stuff but there to the point where it's basically man portable artillery.

Now on a side notw these a few guys taking the .277 furry bi metal case and rednecking them and doing some ...very interesting things swore I saw one guy running a .243 at close to 4500fps but...

It's a more or less, minus the flash hole, a sealed vessel. The flash hole has a brass cap/primer and iirc that one is an inline locking bolt for a more positive stop on the primer.

Standard rifles are unsealed with the chamber. The brass case, supported by a locked bolt, functions as a sealing gasket.

Caseless ammo would require some sort of sealed vessel and steel on steel has always been problematic at getting a complete seal. It can be done as the big 16" rifles on the battleships were essentially caseless with just powder and shell.

Other problem with the 5k+ is you probably won't see it legalized for hunting outside of out west.

I love mine. Shot the same .45 xtp out of black powder for years almost always had to follow the blood trail. Got my savage ml2 and they almost always drop. Amazing waht 300 to 400 fps will accomplish.

The plastic sabot is why they don't shoot faster. BAD BULL makes some in KY that don't use a sabot that hit around 3k fps. But they are above my willing to pay price range so far.

On the 5,000 fps, what is the point or purpose? What does that get you when bullet arrives at it's final destination that 3,200 fps doesn't?

well 5K fps has been achieved,, burnt thee throat out within a single digit round count. you want max power or you want longivity,, same as car motors, extreme power means a short lifespan.

Meh. I like big chunks of lead better anyway. Give me a 444, 45-70, or 450 Bushmaster.

I have NEVER said the old cartridge's outperform the new ones. I say the new ones are not an improvement over the old ones. See no reason to buy a 300 black out or a creedmore. I already have guns that perform as well.

I have a black out to meet no longer in effects of state land hunting restrictions in a low recoil adjustment platform for my youngest when he was 7. To me it's OK if you want or need an AR platform. killed several deer with it between the kids and I and it works but it's nothing special for sure. I have zero use for it since our ruled have changed.

And the thread is correct there is nothing new that does anything any better than a much older round. Only good to sell more guns Magazines and gear.

Generally agree. Most cartridges are just variations on a theme. However, something like the 300blk has a distinct niche use in subsonic suppressed form. But I would also think that the users actually needing that exact use are probably less than 1% of shooters of all disciplines. Lots of want the cool factor, which imo needs no justification.

Most folks cannot hit a 8” plate much beyond 300 yards. Going faster won’t help that much.

If you want to get the most out of whatever your shooting this guy gives good advice

Well, bullet construction is much better than it was 30 years ago. 30 yesrs ago the only hunting bullet other than the jacketed soft point was the partition

One of worst developments in shooting sports I can think of is advent of the long range shooting game. One thing to pop paper plates at 1,000 yards with 6.5 Creedmoor. Another to take down a deer with same rifle at that range, which has led to well founded concerns. Lot of gut shot and otherwise crippled deer have wandered off to slow deaths. Rifle isn't the problem. Knucklehead holding the rifle is.

I know of one internet xpert who has made a name for himself in game of long distance hunting..........say out to 800 yards or so. It's not with a CM.......more like 300 Win mag or 7mm RUM. It takes a pretty big cannon to put enough energy downrange to do significant damage. Too many guys seem to be unaware of that.