Have a rifle that is currently in 6mmAI (Ackley) and going to rebarrel, want openions on which cartidge would be best. What I do is long range varmint shooting so need 75-90 gr bullet with all the velosity I can get (and still be accurate out to say 700yds) I am considering changing to the 6mm-284 because I could buy good brass in 6.5-284 and neck it down. I would not have to fire form it. Any advice is welcome.
6-284 gets my vote you will get about 150 to 200 fps+ more than the 6mm AI and you do not have to fire form. I shoot 95 grain Ballistic Tips out of my 6mm-284 at 3500 FPS+ and the accuracy is out standing. I have a 28inch Hart 9 twist barrel but if you are going to shoot VLD bullets over 95 grains make sure you get an 8 twist.
Another vote for the 6mm-284. I have a 1:8 3-groove Pac Nor that shoots the 70gr. BK's and 107 SMK's quite well.
As for necking down, I just ran the new 6.5-284 brass into my full length die with normal lube on the body and the neck. I didn't lose a single case. Depending on your chamber neck diameter you may or may not be required to turn the necks. I ordered a tight neck and an unturned neck will not even chamber.
The 70 grainers do 2.5" often out at 480 yards, with groups in the 0.3XX - o.4XX range at 100 yards, and the 107s give me 8" groups at 1100 yards.
Thanks, Great info, I am just about ready to make the decission to 6-284. How is it for barrel life, I expect it will be a barel burner like the AI, but hey you have to pay the piper if your gonna dance!
Do you mind sharing the loads you use?
As a former reloader of a fast twist 6/284, If you have the time to mess with it they are alot of fun, doing the cases, outside neck turning etc...they will shoot and they will shoot far very very accurately. During our last Groundhog match the winner in the heavy gun I believe was using a 6mm AI and it shot a 5 shot group at 500 yards of 1.332 inches and if you do any long range shooting from a bench that is not easy to do so I'd say they are capable of outstanding accuracy to say the least..a little over an inch and a quarter at 500..awesome, if you think not, try it-you may go a lifetime and not do it with any cartridge..can't wait til' this saturday to see if he can dublicate it.