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Joined: Jun 2011
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I traded into a mark 1 .22 cheetah awhile back. We loaded up some 52 grainers and stepped up to the chronograph with much anticipation only to be let down. We renamed it the .22 housecat. I was only about 120 fps faster than a regular 22-250. I did have some very interesting results loading superformance powder in a 22-250 improved version though. We loaded 70 grain Berger's and superformance powder in a rifle that has a 27" barrel and a chamber half way between an ackley and a stock 22-250 case. We chronographed 3600+ fps and loaded the same brass 4 times. Never had a sticky bolt and brass was still good all the way around. We loaded up incrementally at least 6 times before we reached that velocity. I will say one thing about these high speed fast twist barrels wipe out used often is your best friend.

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22-243 might be an option, get a very good barrel and life will be comparable to other fast calibers. Brass is readily available and just run it thru the die and reload. Have seen them to be very accurate even pushing 3000 rds.


"We are building a dictatorship of relativism which recoqnizes nothing as definitive and whose ultimate goal consists solely of ones own self ego and desires."Cardinal Rathzinger
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Built our first 22-6mmAI shortly after Ross Seyfrieds article in the Rifleman (Jan 08). This was a 7 twist Douglas Stainless blank fit on a long 700 action. Results were impressive on steel to1180 yds and prairie dogs over 1000 yds. It loved 75 Amaxs and Bergers too. After about 300 shots it started taking bullets apart, about one out of four or so would make a puff of dust maybe fifty yard from the muzzle. The throat and about three inches past were very rough. Put on a new 8 twist Brux but held the same reamer back to Creedmoor length. All is well after at least 500 shots. Standard 22-250 brass headspaces perfectly but comes out with a way short neck compared to the 6mm brass.
Cases are easy to make for the standard 22-6mm AI. Use a 6mm AI bushing die with the proper sizes bushing for your neck. I made a Wilson seating die with my chamber reamer. Have fun. Dale

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Originally Posted by 3584ELK
Originally Posted by boatanchor
About 20 years ago me and my nephew tried about every 22cal possible. we tried a 22-284 that is just slightly larger capacity than a 22-6mmAI........you will never get the speeds you think you will and the barrel will be half shot out by the time you work up a load. Biggest I will go ever again is a 22-250AI with 1-8" twist. about 5 times the barrel life and you give up very little velocity.


Pretty much the truth. I had a .22-6mm made up in a 26" barrel, and my experimenting has lead me to using Norma MRP with 75 grain bullets. I still cannot manage less than 1" groups at 100 yds, though...not impressed thus far.


In trying yet another load, I managed .890" 5 shot groups at 100 yds: R-P 7x57 cases, 50.0gr. MRP, 60gr. Hornady V-Max bullets for 3865 fps.


"I didn't realize we had so many snipers in this country." by J23
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barrel life.........?



T R U M P W O N !

U L T R A M A G A !

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tikkanut:

Undetermined as of yet. Currently my rifle has 200 rounds down the pipe.


"I didn't realize we had so many snipers in this country." by J23
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