6mm/22-250

[CaptJim]

I am considering this caliber for re-chambering my old Rem. 700 Varmint Special .243. The throat is rough, but the bore looks good. The barrel is a 1:9 and will be about 22-23" long after we cut it back.

This version will use the 22-250 brass and neck expanded to 6mm in the resizing process.

Wanted to see if anyone had any experience with this round. Especially with a 1:9 barrel. I have done some research but most info relates to other twist rates. I am wanting to shoot varmints and do some long range target shooting with this with 105-107gr bullets (600-1000yd). Not wanting a hyper-velocity rig. As I understand from what I have read this round is more barrel throat friendly.

I guess my real dilemma is whether the 1:9 will be appropriate or should I plan on a new barrel with a different twist.

Any information is greatly appreciated.

Jim

 

[stello1001]

This would be the infamous 6-250. In my opinion, you might want to go a bit more aggressive on twist but I could be wrong. I guess speed also comes into the equation. Do you know or have any idea what velocities you'll be getting?

I could be wrong as I know nothing on these Wildcats but as a general rule, I know that slower projectiles need more twist to stabilize than faster ones.

 

[Codiekfx400]

If you hand load I would recommend a 6mm Creedmoor. That 1-9 twist will shoot a 87 vmax and possibly a 95 sierra tmk.

 

[CaptJim]

The 87 and 95 doesn't sound too bad. I had originally picked out the 6mm Creedmoor, but the instructor of the smithing class I am taking has the 6mm/22-250 reamer that I can use for free. I know the Creedmoor has more velocity but at face value the 22-250 based round doesn't seem too lacking. especially without having to buy/rent a reamer.

 

[RTH1800]

Going to be very close to 6x, 6xC, 6x47 and a lot of other stuff. No need to re invent the wheel. Unless you like reinventing the wheel....

 

[Codiekfx400]

It might be in your best interest to leave it a 243. Why? You already have the brass and dies I assume. Also the 243 will feed a little better out of magazines because it has no taper to the case. Also the 6Creed is advantageous for shooting the heavy long bullets which you are not shooting in a 1-9 twist. So I would say go 243 and that will save you some money on buying new brass and dies. Or if you do go with a new barrel go 1-7.5 or 8 twist and do the 6mm Creed.

 

[Cascade Hemi]

That'll be a fun project. My last 243 barrel was 1/9 and shot 105 VLD just fine. My preference would be 1/8 but if this is a budget build and you're ok with 95gr bullets it'll still easily go to 1K yards.

 

[CaptJim]

That'll be a fun project. My last 243 barrel was 1/9 and shot 105 VLD just fine. My preference would be 1/8 but if this is a budget build and you're ok with 95gr bullets it'll still easily go to 1K yards.

You and Codlekfx hit the nail on the head. These are my two choices and actually the barrel shot well as a 243. I was just thinking the 6mm/22-250 might be a little easier on the throat. If I can't shoot 105"s so be it.

 

[CaptJim]

Thanks everyone for your comments.

 

[Deleted member 10043]

Looks like nobody has experience with the 6-250. The person you need is Robert Whitley. I shoot a .244 Rem 1:7 in that bullet range.

 

[pjparker]

Just came across this post, here' what I can tell you.

The​

6mm/22-250 came about from the very similar 6mm International back in the 60's and has several slightly different reamer variations throughout it's history. I came to know of this cartridge by an overheard conversation on the firing line between relays. Since I had been coveting an RPA Quadlock action which the subject rifle had, I negotiated a really reasonable buy. Brass and dies came with it and I became the owner of a 6mm-22/250.

I found that it was less trouble forming cases by necking down 250 Savage than necking up 22-250 brass. I had more trouble than you could imagine trying to get the donuts out of the necks of Lapua 22-250 brass. If you are going to stick to the lighter end of the bullet weight spectrum, this may not be an issue if your throat length allows you to seat bullets just short of the neck/shoulder junction and avoid the donut issue. My experience is exclusively with the 105 - 108 gr VLD type bullets, so it was a real issue.

Your 9 twist will probably be fine for you with lighter bullets, you'll need an 8 twist for the heavier bullets and you'll find a longer barrel will help keep the heavier bullets supersonic out to 1K.

Mind you that all of this is from the perspective of an F Class shooter , known distance on a square range. I have done well with it, but something a little heavier will be much better in the wind at extended range.

 

[Dale264]

I looked into this cartridge for quite the long time. I ended up deciding against it because of the minor variations between it and all the very similar wildcats and didn’t want to fuss with making super all my equip. was to the same spec. But with the 9t barrel you should be able to launch the 95gr class bullets up to about 2900fps and close to 3800 with the 55s.