swift improved
- Thread starter wboggs
- Start date
Bill, the 22-250 has an increase of .040" dia at the shoulder body junction leaving .014" taper.
it gains 10% water volume
The 220 swift has a .402 shoulder dia, and body,base dia of .445, thus you would be limited to an expansion of no more than .028 atthe shoulder/body junction plus the 40degree,
i would estimate that you gain no more than 6-7%, not bad but notas much as 22-250 which should exceed out put of the 220 AI with same weight bullets, etc
THey are so close together anyway and the22-250 is easier to get brass, and shoot.
Bob
it gains 10% water volume
The 220 swift has a .402 shoulder dia, and body,base dia of .445, thus you would be limited to an expansion of no more than .028 atthe shoulder/body junction plus the 40degree,
i would estimate that you gain no more than 6-7%, not bad but notas much as 22-250 which should exceed out put of the 220 AI with same weight bullets, etc
THey are so close together anyway and the22-250 is easier to get brass, and shoot.
Bob
Hi WBoggs,
With mine I gained just under 10%. Original loads were 44.1gr of N160, with new Kreiger barrel chambered in 220 Swift AI with the 40 degree shoulder I load at 48gr of N160 this is wth a 52gr Barts bullet.
Velocity is a shade over 4000 fps, with no pressure signs, accuracy is fantastic, I'm sure it is capable of a few more fps but why spoil a good thing
Regards
Steve
With mine I gained just under 10%. Original loads were 44.1gr of N160, with new Kreiger barrel chambered in 220 Swift AI with the 40 degree shoulder I load at 48gr of N160 this is wth a 52gr Barts bullet.
Velocity is a shade over 4000 fps, with no pressure signs, accuracy is fantastic, I'm sure it is capable of a few more fps but why spoil a good thing
Regards
Steve
This cartridge is a great setup with a fast twist and a 75 A-max. This will launch rockchucks into outer space. 8) Paul.
www.boltfluting.com
www.boltfluting.com
I shoot 52 gr sierra's at around 4100 and it will lift a prarriedog way out of his hole, and is extremely accurate Jim
Hotshot
Silver $$ Contributor
An article in the recent Varmint Hunter magazine comparing overbore 224 cartridges shows:
22-250AI=46.9 grains of water
22-243=50 grains
22CHeetah=54or56(2 different shoulder angles)
220SwiftAI=57 grains
22Clark(6mmRem case)=59 grains
No way is the 22-250AI even close, in fact it won't equall a standard Swift. The 220Swift case is without question much stronger built in the base and web area. I get sick and tired of hearing 22-250 guys trying to justify their inferior choice.
With that off my chest, I'll share my experience of shooting tens of thousands of rounds with both 220 and 220AI over 50plus years.
I don't believe the additional powder capacity of the improved version makes a significant improvement with a 1:14 twist barrel and 40 to 55gr bullets. I use mostly IMR4064 and H414 powders and prefer the 55gr Nosler b-tips, but I have used more than a few 50gr and some 40gr bullets. A couple grains of powder in the larger case does nothing for velocity and 3 to 4 grains more shows significant pressure increases with the modest velocity gains.
There are some much better performance gains with the 220AI when going to a 1:9 twist and shooting 69-80gr bullets. 200-300 fps more velocity using a few grains more of the slower burning powders really makes a difference down range a far targets.
Another benefit of the 220AI case is that the need to trim the brass seems to be much less than the standard Swift cases.
One other observation on the 220AI case is that they are a bit harder to reload as far as resizing. Too light with the lube and they stick real easy because the cases are so straight walled. A little too much lube makes for big ugly lube dents on the shoulders.
P.S. Before anybody jumps my comparison of the 220 vs. 22-250, I have also fired tens of thousands of rounds in the 22-250 as well. I love the cartridge. It just ain't a Swift!
22-250AI=46.9 grains of water
22-243=50 grains
22CHeetah=54or56(2 different shoulder angles)
220SwiftAI=57 grains
22Clark(6mmRem case)=59 grains
No way is the 22-250AI even close, in fact it won't equall a standard Swift. The 220Swift case is without question much stronger built in the base and web area. I get sick and tired of hearing 22-250 guys trying to justify their inferior choice.
With that off my chest, I'll share my experience of shooting tens of thousands of rounds with both 220 and 220AI over 50plus years.
I don't believe the additional powder capacity of the improved version makes a significant improvement with a 1:14 twist barrel and 40 to 55gr bullets. I use mostly IMR4064 and H414 powders and prefer the 55gr Nosler b-tips, but I have used more than a few 50gr and some 40gr bullets. A couple grains of powder in the larger case does nothing for velocity and 3 to 4 grains more shows significant pressure increases with the modest velocity gains.
There are some much better performance gains with the 220AI when going to a 1:9 twist and shooting 69-80gr bullets. 200-300 fps more velocity using a few grains more of the slower burning powders really makes a difference down range a far targets.
Another benefit of the 220AI case is that the need to trim the brass seems to be much less than the standard Swift cases.
One other observation on the 220AI case is that they are a bit harder to reload as far as resizing. Too light with the lube and they stick real easy because the cases are so straight walled. A little too much lube makes for big ugly lube dents on the shoulders.
P.S. Before anybody jumps my comparison of the 220 vs. 22-250, I have also fired tens of thousands of rounds in the 22-250 as well. I love the cartridge. It just ain't a Swift!
Hotshot
Silver $$ Contributor
357,
That's a good question, but I'm not good at keeping such records. I have two 220Swifts and in the past have had three or more at any given time. My passion is prairie dog shooting and I have in excess of 2000 brass(Win). I load all the empties every winter, then shoot as many as I can during the spring and summer. I mark an X on the load info tag everytime I load a box and some have 8 or 9 X's, most only have 3-5. I don't really have many cases fail. An occasional cracked neck or loose primer pocket gets tossed in the can. I can say the same for 6 other cartridges that I use.
Since I discovered the 204Ruger a few years ago they do most of the work for me now. The fast twist Swift is good for showing off at longer ranges and fighting stiff winds, but I don't care for all the barrel cleaning and cool down time compared to the 20cals.
That's a good question, but I'm not good at keeping such records. I have two 220Swifts and in the past have had three or more at any given time. My passion is prairie dog shooting and I have in excess of 2000 brass(Win). I load all the empties every winter, then shoot as many as I can during the spring and summer. I mark an X on the load info tag everytime I load a box and some have 8 or 9 X's, most only have 3-5. I don't really have many cases fail. An occasional cracked neck or loose primer pocket gets tossed in the can. I can say the same for 6 other cartridges that I use.
Since I discovered the 204Ruger a few years ago they do most of the work for me now. The fast twist Swift is good for showing off at longer ranges and fighting stiff winds, but I don't care for all the barrel cleaning and cool down time compared to the 20cals.
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