6-284 vs 6mm Rem AI

[243LPR]

How do these 2 compare as far as case capacity/efficiency?

[nsaqam]

The 6-284 has a bigger boiler room and is a true SA cartridge whereas the 6 Rem AI is an intermediate length cartridge not particularly well suited to the confines of a SA mag box.

[243LPR]

I'm picking up a long action and am torn between these 2 for a build.I already have brass and dies for a 6mm Rem.,and I won't have to do any case forming.

[calib]

if you already have the stuff to do a 6mm ai them do one of those i have seen some good things from thos with other people.

i am going from a 243ai to the 6-284 i should be getting my barrel in a week to 3 weeks. cant wait to get it loaded up and shooting.

[Blue Avenger]

I like both my 6 rem ( 1"@200 from a 17" barrel ) and 6 rem AI. Also my 6br. I got these after hearing the 6-285 has a shorter life and can be finicky to get small groups.
I have a 243 & .243AI also, but not done much with then. Thinking 6mm-06 down the road.

[243LPR]

What's the best brass for 6mm Rem. Ackley? Probably not made by Nosler or Lapua are they?

[stevec]

I have no experience with the 6mmAI but I agree with Blue that the 6-284 can be finicky. I used mine for F-class and it shot good on certain days and not so good on others. I only got 800rnds down my 6-284 before the throat was gone.
I believe the longer 6mm neck would help with the throat erosion but it is just a theory based on my random thoughts! :D

Steve

[243LPR]

No recommendations on brass? :-\

[helotaxi]

If you're already working on a long action, why not go with a 6mm-06?

[243LPR]

Don't feel like turning necks and don't need the small velocity gain.

[efw]

Well if you do a -284 you're coming down from .264, (presumably) which is .007" more than if you use .25-06 brass... Just food for thought...

[243LPR]

I'm leaning towards the AI more all the time.Now if I can just find a good barrel w/o having to wait 6 mos.

[Blue Avenger]

I'm leaning towards the AI more all the time.Now if I can just find a good barrel w/o having to wait 6 mos.


6BR can be punched out

[calib]

you may be able to find one if you dont mind a varmint contour at the savage-barrels.com they are a sponsor and if they have one in stock it will only take a week

[gotcha]

I love my 6mm AI. Use 6mm rem brass. Fire formed while doing load developement then annealed. Cases have never needed trimming as they will shorten upon fire-forming. 40* nk means almost "O" case stretch & very little bolt thrust. Mine is a twelve twst "critter gitter" shooting 70 & 75 grain bullets. About 1200 rounds through it to-date. Minimal throat erosion & expect at least another 1200 rounds based on present wear. Started w/ Redding dies & got lousy concentricity w/ neck sizer 'til I bought a Lee collet. Which got me to shooting bug holes. RL-19 also woke this cartridge UP! Obviously the choice is yours. But if I had a "do over" I'd stick w/ the 6mm AI. Good luck with your decision :)

[243LPR]

I'm actually looking for a varmint contour but they're only showing it in bull(too heavy).I could pre-order one from gun shack but not sure about Shaw quality to be a tack driver.

[gotcha]

You might check w/ Krieger. They show BBL inventory on line. When I built my .257AI they just happened to have the perfect bbl "ready to go". They will set up for bbl nut or standard shoulder & also chamber if you'd like.

[adam330]

Gotcha,
Did you have to special order your Lee collet die? I have a 6mmAI barrel ordered and am getting ready to purchase all of my reloading components. Any knowledge you can provide would be greatly appreciated.
Thanks,
Adam

[243LPR]

Got in on the pre-ordrer at Gun Shack for a 6mm Ackley. Now just need to wait and start getting supplies.

[BWB]

Has anyone fire formed 257 Roberts bass for the 6mm AI?