4200 fps!?

[Nature Boy]

There are some reports claiming 5,000+ fps using a .22BR. Wonder what the barrel life on that would be?

 

[TwoEyedJack]

I would call what I do a "partial full length resize" with the .22-250. My procedure is to set the die so that closing the bolt requires a fair amount of effort. This results in minimal extra headspace, which in turn results in minimal growth in length and minimal thinning in front of the web, and a longer case life.

When I reload for big game hunting rounds, like .270, .308, and .338, I full length size so the bolt closes easily in case I need a quick second shot. You get fewer loadings before the casing wears out, but that is not a big consideration for hunting. I also size for semi-automatics this way. They just don't have the camming action necessary to chamber a minimally sized casing.

 

[mshootnit]

22-284 Win. 27" custom barrel, moly coated bullets. Very fast.

 

[fireman 9731]

It would be neat to approach the mile per second mark. Not because it would be practical, but just to do it.

And to further actually travel a mile in one second... velocity at the muzzle would have to be much higher than just 5,280 fps. I'm guessing maybe in the 7,000 fps range.

 

[leadaddict]

It would be neat to approach the mile per second mark. Not because it would be practical, but just to do it. And to further actually travel a mile in one second... velocity at the muzzle would have to be much higher than just 5,280 fps. I'm guessing maybe in the 7,000 fps range.

I like the way you think! According to the ballistic calculator on my phone (Strelok) if you use a 40gn hornady it needs about 11500 fps to reach a mile in one second. It has 88 inches of drop (~5moa) at a mile below a 100yd zero.

 

[fireman 9731]

if you use a 40gn hornady it needs about 11500 fps to reach a mile in one second

For practicality, A heavier bullet wouldn't need as much initial velocity. It would need more powder to get it up to speed, but it wouldn't shed that speed nearly as fast... Maybe a 50 BMG case necked down to 6.5mm would be a sweet spot.

 

[Sniper66]

I have two .204s, A Ruger #1 and a Kimber 84M. I load 32 gr Sierra BKs for the Ruger right at 4000 fps and load 39 gr BKs for the Kimber at just under 4000fps. I shoot lots of prairie dogs with them and they do explode. My .223 loaded with 50 gr BKs at around 3500 fps does a real number on them, but not like the .204. All 3 guns are quite accurate and lots of fun to shoot.

 

[leadaddict]

Maybe a 50 BMG case necked down to 6.5mm would be a sweet spot.

Agreed! I was thinking specifically of the 204 bullets. I'm guessing you'd want to double up on the ear protection either way.

 

[redneck2]

I had gotten a CZ 527 in .204. First groups were awful, maybe 2-3" range, some larger. Got advice from a number of owners to try Blitzkings.

My current load is 39 grain BK over Varget. Shoots .3's-4's now. Combination of finding the correct load plus getting the barrel broken in.

Works great for doggin'. You basically have the ballistics of a .22-250 with the muzzle report of a .223. That makes a huge difference in the number of dogs that stay up. Sold my .250.

 

[lysanderxiii]

I wonder what kind of velocity you could get with a saboted 75 grain bullet out of a .50 BMG?

I figure the sabot would weigh about 80gr, giving a total weight for interior ballistics purposes around 150 to 175 grains.

 

[Art Eatman]

I don't recall any numbers about performance, but not long after WW II a couple of wildcatters made a .22/50BMG. Saw a picture; weird!

 

[General Geoff]

This thread reminds me of my favorite wildcat cartridge, the .22 Eargesplitten Loudenboomer. .378 Weatherby Mag cartridge, necked down to accept a .224 bullet. Ackley developed it to break the 5000fps mark but only managed about 4600. Oh well.


edit; photo.




edit again; that might be a photo of a different, more ridiculous cartridge (maybe the aforementioned .50BMG necked down to .223?). Found this image that might be the real deal.

 

[lysanderxiii]

You would get higher velocities out of a saboted projectile.

 

[razorback2003]

204 is a great round. I have shot the factory Hornady V Max 32gr ammo in a bolt action rifle and there is only from what I remember 4-5 inches of drop from 200 yards to 300 yards. It shot at the same point at 200 as it did 100. The Hornady V Max 204 32 grain ammo is sold at Academy for 20 dollars.