Fast twist 22-250 Load advice

Hey guys. I have just purchased a Tikka 22-250 with a 1-7 twist 21inch Proof research carbon barrel.
I am going to do load development for it, I already have a tikka Supervarmint 22-250 1-12 or 1-14 twist.
My question is, I have approx 500 50gr Vmax projectiles and about 2kg of Benchmark 2 ADI powder.
Does anybody load light projectiles into a fast twist or am I better to forget I have all those projectiles and try heavier ones like a 80gr eldm?
Any info or advice would be greatly appreciated.
Cheers

Have you worked out your maximum COAL with a tool like the Hornady COAL gauge? Do you know how the really long for calibre bullets will be seated? I’d want to know that first, so maybe someone can send you some samples of various long for calibre bullets.

Attachment 150077 any luck with the stock, Curtis

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Originally Posted by mimms2

There's really no such thing as "too much twist"

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This just isn’t true. Lots written about it. Not a massive risk but a risk nonetheless. But no point debating it here because we will go to far off topic. If I remember correctly there are some on this forum who have witnessed thin jacketed bullets blowing up due to high velocity and overspinning.

The question is whether or not @Curtis27 would see any benefit from using heavier projectiles. The whole point of this chambering having a fast twist is to use long for calibre, high BC bullets which give a massive upgrade in ballistic performance downrange. Curtis, I suggest you hop onto something like the Hornady or JBM ballistic calculators and see for yourself. The windage performance and retained energy of a 80 grain ELD-M at 300m compared to a 50 grain V-Max is night and day. With the barrel you have it wouldn’t even enter my head to stick with the 50 grain.

Quote:

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Originally Posted by Flyblown

This just isn’t true. Lots written about it. Not a massive risk but a risk nonetheless. But no point debating it here because we will go to far off topic. If I remember correctly there are some on this forum who have witnessed thin jacketed bullets blowing up due to high velocity and overspinning.

The question is whether or not @Curtis27 would see any benefit from using heavier projectiles. The whole point of this chambering having a fast twist is to use long for calibre, high BC bullets which give a massive upgrade in ballistic performance downrange. Curtis, I suggest you hop onto something like the Hornady or JBM ballistic calculators and see for yourself. The windage performance and retained energy of a 80 grain ELD-M at 300m compared to a 50 grain V-Max is night and day. With the barrel you have it wouldn’t even enter my head to stick with the 50 grain.

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Thanks for the replies. I think using the 50gr as stated will defeat the purpose of having a fast twist barrel. I want it to be safe and mainly use 22-250 for varmint and wallabies etc. Fallow deer if I come across one while varminting. As for powders does anyone have experience loading with benchmark 2? Or would the likes of 2209 be a better option to try

well I dont have a fast twist .22-250
BUT I do shoot wallabies etc with 50grn vmax (awesome wobbly load) and occasionally the odd deer or pig falls over with the wee gun doing the tipping over bit....WHAT I DO is dual load...eg carry some other loads in tit pocket..,my goto load for this is at present a 50grn flatbased barnes ttsx and ffrom results so far it wont bechanging in a hurry....IF a .22-250 will group them,and cant see why not as my 1;12 .223 does,they will be perfect for the job...the extra speed and twist will make them open very very well.....a heavier projectile will be better out further BUT it would have to be quite a bit past 200 yards (my maximum for .224 on bigger game) before it would be a game changer for me....the wee barnes work so well.... BM2 is lovely powder to load as its fine ball powder like win748,meters easy and trickles smoothly vs the chunks of log which are ADI stick powder...either will work fine. just finished loading 2208 in .45/70 and it trickles fine and metered pretty darn close ,so the difference in powder shape is trivial thing.....being ABLE TO GET powder you want is a bigger issue as of late...get what you think will work and if its ok grab more while you can. it wont go off in hurry if stored well.

if your wallaby shooting is normally sub 300 yards and you have 50 grn vmax projectile on hand...go to it with a will...man they will be super explosive,MAYBE too much so as flyblown has alluded to so might be a good idea to load them at starting load levels....NO it doesnt defeat purpose of 22-250 a 50 grn pill at say 3300fps will be more than doing the job humanely. the projectiles are cheap enough. no harm in having longer slippery loads for the sitters at 350-400 .and I do agree with flyblown that a heavier longer slippery projectile will suit rifle better... use the other rifle with the 50grns and be happy.....but if you are going to mix up rifles...I really hope you have the 50s with the fast twist and not the heavies with the slow twist,or you will likely have shotgun like patterns and not have a good day at all.

Your objective is a high case fill ratio, so rather a slower powder than a faster one.

What I recommend is getting your hands on some of the bullets you want to try and then we can work out your cartridge overall length based on when the bullet touches the lands. This will then tell us what your potential powder capacity is. You will also need to measure the case capacity with water, You can find out online how to do that.

Once you know these variables then you can pick a sensible powder to use based on attaining an appropriate 90-95% case fill ratio, with a burn speed that generates safe pressures. Typically in the list of powders for a specific cartridge and bullet weight there are only one or two options that will meet these criteria. For ADI brand, I wouldn’t mind betting that 2209 and 2213SC are pretty close to spot on. I can have a look on Quickload a bit later if you like. But you will need to check your max COAL because if your chamber hasn’t been cut with long for calibre bullets in mind you are disadvantaging yourself using the heavy .224s, and you might need to go for a more middleweight bullet. (Because if you can’t seat the really long bullets far enough out you are robbing too much case capacity and won’t be able to drive them fast enough to make them worthwhile)

I love 250's, a great calibre. Because you are relying on speed not bullet diametre to do the work, for deer I would go with a hard bullet that can take the RPM's and punch through. A Nosler 70 gr Accubond would work well IMO. Often a really heavy bullet might look good on paper but it can be a slow killer on game and really rob velocity.

Attachment 150102Attachment 150103
50gr Z-max measures 2.488" on COAL gauge
Sierra 77gr TMK measures 2.585"

For the 77gr TMK:

2208 or 2206H are looking like the best options. I would try them in that order.
2209 & 2213 are a little too slow.
BM2 is definitely too fast and results in a low case fill (<80%).

Because its a 21" barrel you're losing a bit of speed, ~100fps. But the 2208 is still almost all burnt (>99%). It will be loud!

The QL model has 34gr 2208 at just below max pressure, 96% case fill ratio. So start around 32gr.

Do you own a reloading manual?

Nick Harvey’s one has heavy bullet loads for the 250

Otherwise try ADI, they make the powder your using.

@Curtis27 I am using 55g in a 1:9 so cant offer any advice on 50g but I imagine they will be fair moving. Have 55g going at around 3720fps using 2206h.
75g eldm going at a bit over 3100fps using 2206h also.

In my very unqualified opinion I say load em up and see how they go if that's what you want to use. Soon find out. The heavies will shoot fine as well.

If you would like some 69gr Targex to try let me know & I can get a few to you. They will work fine in the twist you have.
Cheers

Those Targex will be a nice mix of speed and thump.

I'd avoid the 50's as they may (may not) spin up to much and become vapor before they hit the target.
1-7 Is really fast for the light pills with so much powder and as you said, it kinda defeats the purpose.

We used to use the 45gr hollow points from Winchester... lots of puff on plovers.

75 Eldm will also be a nice round too.

rash generalisation here.......I BELIEVE most 55grn projectiles have traditionally been stouter/harder than 50 grn projectiles of same type
I BELIEVE historically this was due to the 50grn being a 222 projectile and 55 used in .223 and faster......its the reason Ive always leant towards 50 grn projectiles in my 223 for wallabies .I can push them along with a not so hot load and they still do the expandy/killem quickly thing.
of course when talking a varmint/varmit dedicated projectile all bets are off,they are designed with thin jacket to blow up on impact with little encouragement.

I know that the cullers in the 1960's found Norma ammo was the best in their 222's. With all the other brands the bullets were too soft and blew to bits. The Norma would fully penetrate a Bull Tahrs chest. So use a harder bullet. Like MD suggests the 55 Barnes could be the go to 300

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Originally Posted by Moa Hunter

I know that the cullers in the 1960's found Norma ammo was the best in their 222's. With all the other brands the bullets were too soft and blew to bits. The Norma would fully penetrate a Bull Tahrs chest. So use a harder bullet. Like MD suggests the 55 Barnes could be the go to 300

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I used Hirtenberger 50 grn. It was cheaper than Norma and just as good. I was paying for mine meat hunting so liked the saving. Not sure if they make ammo any more but it was good.

Im dubious of 55grn barnes after watching video of them in use on a billy goat...the 50grn flat base ttsx work great for me in .223
the 55grn loads I got given ,pattern/group well ,havent tried them out on game yet.

It may be out of flavour these days but I still use h380 and get really good results, I’ve used this powder with 50gr zmaxs in 5 different 22-250s and all shot really good. None are fast twist but that combination of ammo is cheap and readily available to me at present


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Im pleased to read that....might just have to go down that rabbit hole one day myself.

I also had my eyes on that 22-250 but still waiting for my FAL. Use to shoot a 1:8 twist 22-250 AI. The lightest bullets I tried was 75gr range. I would recommend looking at 75gr bullets plus given the challenges with lighter bullets potentially failing as a result of the tight twist. There are some US forum with some data on what lighter bullets normally withstand tight twist better, but some suggest the rifling has a lot to do with it. If you are looking for a flat shooter I would start with the 75gr EldM. I’m sure you will be able to reach 3350fps+ but my experience with my previous rifle was that a I got better consistency at 3200fps. The first bullet I had in mind for the rifle was the 88gr EldM and if that didn’t work the 80gr EldM at 3200 fps and N160.