22-250ai ?

[calib]

i will be building a 22-250 ai in the near future and was hoping i could get some loads. it will have a 1:12 twist and be 28" i am looking to shoot 55 grainers maybe some 60's if i can get them going pretty good. i am looking to shoot coyotes, rock chucks what ever out a ways.

thanks

 

[alf]

I'd really reconsider the 12 twist, if it's not too late.

An 8 twist with the 75/80 grain class bullets would really shine at the further distances.

With the advancement of better, more affordable rangefinders, there's more sense in building around a heavier, better BC bullet now days for their wind fighting abilities, then to build for raw speed in the lighter weights.

 

[John from MN]

The 75 and 80 grainers make me look better than I am. Nothing wrong with the 55's and 60's. The heavier bullets seem to make consistent hits easier, though. The 75 grain Amax works well on woodchucks and even prarie dogs. The 80grain Bergers hammer coyotes. Good luck with the new rig.

 

[boltfluter]

If I remember correctly 38.0 gr. of IMR 4064 was always the load to beat in my .22-250 Ack. with a 55gr. Sierra. Start at 35.0gr. and work up, as 38.0 was absolute max. in my gun. Hope this helps. Paul. 8)

www.boltfluting.com

 

[trentalan34]

I have had the best luck with H322 and 52 SMK. I really wish I had a faster twist for the heavier bullets though.

 

[calib]

it is too late to change the twist, but i have other guns like 2 243 ai's and soon a 6-284 to shoot real long range dogs.

ill have to try the 4064 load, though i dont have the sierras, but do have noslers in 55 grain.

i have some 53 grain hornady match i wonder how those would work out. i wanted to use the 55's to 60's to get some flat trajectory, but still have some power out there a ways. i realize that these wont compete with the vld's out there a ways, but thats fine.

 

[rich44]

I have a 22-250AI 8 twist and a 12 twist try the 53gr Amax in your 12 twist Im still working up a load in the 12 twist but so far the 53gr Vmax is working pretty good this is the first group with the 53 Vmax

 

[calib]

I have a 22-250AI 8 twist and a 12 twist try the 53gr Amax in your 12 twist Im still working up a load in the 12 twist but so far the 53gr Vmax is working pretty good this is the first group with the 53 Vmax

thats a good start there how much more do you need to improve that? what is the load

 

[bozo699]

I have a 22-250AI 8 twist and a 12 twist try the 53gr Amax in your 12 twist Im still working up a load in the 12 twist but so far the 53gr Vmax is working pretty good this is the first group with the 53 Vmax

If he played with neck tension and or seating depth it probably would tighten right up.
Wayne.

 

[calib]

i am gonna have to search about neck tension, cause i dont completely understand how it all works. i dont know what my .22-250 ai chamber will allow for necks, but i know the 6-284 that is gonna be done will allow a .282" neck. now i have heard that how far down the neck you size will help with tension, but i dont know anything about turning or any other methods

 

[CanusLatransSnpr]

Neck tension has to do with how much the neck diameter "grows" after you seat a bullet. For example, with my .243 Win a sized neck diameter .2695 and after I seat an 87gr. Vmax it measures .2715. Therefore, the neck tension would be .002" of an inch, which is good. From my understanding, longer shots require more neck tension to keep the groups from opening up. Perhaps less runout for a loaded round? Wayne could explain that better than I !

Mike

 

[calib]

that doesnt sound too complicated what tools are required to do the measurements?

 

[rich44]

I have a 22-250AI 8 twist and a 12 twist try the 53gr Amax in your 12 twist Im still working up a load in the 12 twist but so far the 53gr Vmax is working pretty good this is the first group with the 53 Vmax

thats a good start there how much more do you need to improve that? what is the load

The load is 35.5 grs Varget 3644 fps avrg I think I can get a little more velocity that load was almost the max for a standard 22-250 but not bad for a fire forming load

 

[calib]

nice job there
now that you have your brass formed and that group from it what are you going to do with your powder load? i meen are you gonna do a ladder up to max or how do you do the load development from here?

 

[rich44]

I'm setting this up for a varmint gun which in my neck of the woods means groundhogs if I can get another 100-150fps and the groups stay this size I'll call it good enough.
I'll just work up in .2gr increments until I see some pressure signs

 

[calib]

i was just wondering with the ai rounds i have been told to fire form with a max load for the parent case and then work up from there, but that the ai case can take much more powder. i am just wondering since i have no experience with the 22 250 ai.

 

[357Mag]

Calib -

Howdy !

X2 what Alf said.

With 55s, you'll start to run out of gas around 500, especially for confident, clean kills.

Something like a 28-29" 1-8 would allow you to campaign .224" cal 75s, like the 75 "A"-Max.
It's the route I took w/ my large-capacity .224" cal wildcat, and it gave me a dual-role' varmint/target cartridge
that utilized 75"A"-Max for BOTH types of shooting. THis would put 1,000yd kills on PDs and rockchucks within the realm of possibility.

When shooting the 75s, I did have one "shoot-through" on a marginal 200yd hit on a groundhog. The rest of shots w/ the 75s, all went just fine.

I recommend high load densities, and powders like VV160, WW760, I4350 should help you get there w/ the 55s - 60s.

If you do go w/ a longer .224" cal barrel, you'll probably also wanna go w/ a slower burning powder(s)
In my 28" SS .224" cal 1-8 5-groove barrel, my accuracy load was: 40.5gr AA3100 and Fed LR Match uner 75 "A"-Max for 3,420fps.
Switch in load to Fed LR Magnum Match gave 3,500fps honest, w/ a slight opening-up of the groups.

DK if any of that helps ?

With regards,
357Mag

 

[calib]

well it will be a 28", but only a 1:12 twist guesss the next one will have to be a bit faster of twist could i get some mid 60 grainers to go from this barrel being longer and more power to getthem spinning?

 

[bozo699]

I have a 22-250AI 8 twist and a 12 twist try the 53gr Amax in your 12 twist Im still working up a load in the 12 twist but so far the 53gr Vmax is working pretty good this is the first group with the 53 Vmax

thats a good start there how much more do you need to improve that? what is the load

The load is 35.5 grs Varget 3644 fps avrg I think I can get a little more velocity that load was almost the max for a standard 22-250 but not bad for a fire forming load

Rich,
This is not a bad group at all period, but if this was a fireforming group and if it is repeatable it is excellent so excellent in fact I wouldn't waste one shot fireforming at paper or for no reason, I would be killing GH's while fireforming, obviously a well put together rifle and you have done a good job tuning your fireform load, I hope your full house loads are as accurate, your rifle will be a blast while it lasts.
Wayne.

 

[CanusLatransSnpr]

Fireforming with a max load is fine and the barrel should be chambered for a crush fit on virgin brass. If not, you'll have to load the bullets a little long so they jam, holding the case head securely against the bolt face. As far as measuring neck tension, a good 1" micrometer is all that is needed. Be sure to check the calibration of the micrometer prior to measuring the neck diameter. If you haven't purchased dies yet? I would recommend a Redding Type S bushing neck die set and purchase several bushings in .001" increments so you can keep the neck tension right as the brass work hardens. Good luck on the project !

Mike