Author Topic: 22-WSM (Read 1408 times)

Dirigo · « **on:** August 15, 2005, 05:35:03 PM »

has necking a WSM case down to a 22 caliber bullet been attempted?

Nobade · « **Reply #1 on:** August 18, 2005, 02:28:09 AM »

well, the .22 WSSM is plenty big so I don't think you'd be happy with the bigger one.

Dirigo · « **Reply #2 on:** August 18, 2005, 10:50:17 AM »

i want something with absurd velocities

Reed1911 · « **Reply #3 on:** August 19, 2005, 07:19:28 AM »

About 4300-4400 is all you are going to be able to achieve. If velocity is your only concern I'd look at a .204 Ruger, .17 Remington, or the .223 WSSM.

Dirigo · « **Reply #4 on:** August 19, 2005, 09:18:57 AM »

Quote from: Reed1911

About 4300-4400 is all you are going to be able to achieve. If velocity is your only concern I'd look at a .204 Ruger, .17 Remington, or the .223 WSSM.

what if it was necked down to a .204 or .17?

Reed1911 · « **Reply #5 on:** August 19, 2005, 01:18:05 PM »

You might be able to push it to 4500FPS but that's about it. Even if you took a .300 RUM case and necked it down you won't get much more than that. Really the .220 Swift or .223 WSSM are going to be your limit for speed and even both of those are using a lot of powder. Necking down the .300 WSM case will achieve about 25-50FPS more speed with the lighter bullets and use a ton more powder. Now if you were to neck it down and use a fast twist barrel (say 1:7) you could push the 75 and 80g bullets quite fast, but what you trade off is very short barrel life. Like to the tune of 500 or so shots.

Dirigo · « **Reply #6 on:** August 19, 2005, 03:48:30 PM »

4500? even out of a 28 or 30 inch barrel?

Reed1911 · « **Reply #7 on:** August 19, 2005, 09:54:24 PM »

That's about the limit with smokeless powder. What are you trying to achieve.

Nobade · « **Reply #8 on:** August 21, 2005, 03:51:31 PM »

Larger diameter aluminum cored jacketed bullets can be driven to very high speeds, over 5000 fps, but any 22 or 6mm is not going to go much over 4500 fps. To go faster you need to switch from smokeless powder to light gasses such as hydrogen. DOE has done lots of work with these and get some pretty impressive speeds, but they're not terribly portable. (couple of miles long, etc.)

Nobade · « **Reply #9 on:** August 22, 2005, 05:51:01 PM »

Just today I was reading about a 22-378 Weatherby. The guy built it just to roast barrels quickly to test some new coating for some outfit. It shot a 80 grain bullet at 4600 fps, and a 40 grain bullet at 5000 fps. Used 117grains of powder to do it, and the barrel was destroyed (throat moved forward 4 inches, fire cracked, chunks missing, etc) after 64 shots. That's what happens when you neck down a really big case to a small bore.

Reed1911 · « **Reply #10 on:** August 23, 2005, 01:37:34 AM »

I assume he used solid bullets? Or did the article say? Intresting, to say the least. Kind of like dropping a V12 500 cubic inch motor into a VW bug. Good for damn little, but interesting.

Nobade · « **Reply #11 on:** August 24, 2005, 02:04:46 AM »

Sounded like normal bullets - Vmaxes, Matchkings, etc. Didn't publish any accuracy figures, so there's no telling if they even hit the berm. I think he was strictly interested in wearing out barrels. It sure worked for that!

SAWgunner · « **Reply #12 on:** September 15, 2005, 11:00:41 AM »

Yeah, I have done some research into the subject and I think that most smokless powders have a burn rate of +/- 5000 fps...am I correct? If you could find a metalurgist that could put together something that would withstand Det chord, now that would be something. I remember playing with that crap in the Army and the SF Engineer Sergeant told me that the stuff burned at like 16k fps..but I am sure it would cut through any barrel that you could come up with.

Right now I am working on my own home made rail gun...which is proving a pain in the butt considering the tolerances I have to deal with (Not to mention that I can't produce the power needed for the pulse). But I am not giving up.

SAWgunner

Reed1911 · « **Reply #13 on:** September 15, 2005, 11:28:27 AM »

Sawgunner,

It depends on the type of explosive used. PETN runs about 16-18K/sec, RDX, HMX, PYX all run about 25-28K/sec. There is no technology that could efficiently use it as a propulsion system for a bullet at this time. All you can do is use it as shape charges.

SAWgunner · « **Reply #14 on:** September 15, 2005, 12:20:44 PM »

Quote from: Reed1911

Sawgunner,

It depends on the type of explosive used. PETN runs about 16-18K/sec, RDX, HMX, PYX all run about 25-28K/sec. There is no technology that could efficiently use it as a propulsion system for a bullet at this time. All you can do is use it as shape charges.

Kind of what I figured...I couldn't think of anything that could withstand that burn rate. My buddy and I are into .50 BMGs big time, and he has necked down a fifty to a .375" caliber, and he turned his own solid bronze bullets on a metal lathe. He has gotten pretty exotic in what he has used as a projectile out of taht weapon. I believed he used a Krieger barrel blank. He also has a .50 round with a projectile made from 7mm Rem Mag brass. It even has the markings on the base of the "bullet". I think it was made for hunting, although I can't be sure. I will have to ask what it is and what it was for. Anyway...I am rambling..in the wrong forum, also.

SAWgunner