Good choice on the 6-284. I am currently building a 6BR, and have already recieved my lapua brass, it is impressive stuff! It will be nice to have no case prep/cull. I am putting a 1-12, 26"barrel on the BR, as I am building the gun as an ultra accurate varmint gun, and plan to shoot the same weight bullets from the BR, as I do with my 6mm Rem (68-87 grain). I went through the whole process of looking at the different ballistics of the 6mm screamers, and it would be cool to get the 87 vmax doing 3800 fps! Maybe out of a 6-06, or necking down a 270WSM to 6mm. Out of all of the bullets, I find the 6's the most exciting for what I like to do with them (gophers, coyotes at distance!) The 6-06 would be a good one, again because of the lapua brass, I just dont't think that it is as inherently accurate as the stubby cases. What kind of accuracy do you get out of your 6.5-284?
Wildcat, Now your building a good 6mm for those 87gr bullets. I've got a tight neck 6.5x284 that is set up for the 142grSMK and my 6x284 is a tight neck also. I'm always on the hunt for a good 6mm varmit rifle so had a 6-250 build just got it last month now that the weather is alittle better I'll get out and see how it chronographs. Was looking for something between my 6br and 6mmrem and if velocity looks good may do a 6-250AI and that rifle would work out good alongside the 6mmAI. Well good luck and keep us all posted.
My 6.5x284 is an awesome machine. Here are the specs;
1. BAT 8.5 Action
2. 6.5x284 290nk
3. Barrel-Hart 28", 1.050 at the muzzle, 1-8.5 twist, muzzle brake.
4. McMillan Tooley MBR
5. Jewell 2oz Trigger
6. Davidson Base w/20 MOA added
7. Kelby Rings
8. Nightforce 12x42x56mm NXS
9. Built by Dave Tooley
This rifle is very very accurate. My best three shot group at 100 yards is .083, and I have been averaging between .090 to .120 with 139grn Lupa Scenars. My velocities with this bullet are right at 2900fps. My rifle loves the 139grn Lupa Scenars and it seems to like that velocity. I can get them up to 3100 fps, but my accuracy is not as good. I have also tried 142MK and 140 A-MAX's, they don't give me the accuracy that the Lupa's provide.
Wildcat I do not really like to try talk people out of something but I would like to give you some advice. I have a 6-284 with a 27inch Hart with a 9twist. I know you want a 12 but go with the 9. The reason is you are really not going to give up any velocity maybe 50fps at the most with a 9 instead of a 12 and you can shoot just about any bullet you want in it. So if you decide you want to shoot bullets heavier then 90grs you can and some day you probably will. I have shot bullets from the 55gr B-tip all the way to the 105 Berger. Accuracy in any bullet weight has never been a problem. I shot 80gr Bergers at 3750fps with ease and for a long time a 85 Partition was my deer load and that was leaving the barrel at 3780fps. Since I started shooting longer shots I went to a Berger 95vld and was driving them around 3514fps then went to the 105VLD and I am shooting them at 3260fps. I could drive them faster but they shoot great and I will give up the extra 150fps for the way they shoot. I say this to you because my dad made the mistake of getting a 12 twist and would not listen to his son. [img]/ubbthreads/images/graemlins/grin.gif[/img] Now he wishes he got a 9 because a 9 will shoot everything and a 12 will not. You also never want to build a rifle to shoot just that one bullet incase your rifle does not like the bullet you want to shoot.
Dakor, thanks for the advice. I really only want to shoot the 75 grn through 87 grn pills. The reason is, I love to see my varmints explode. The Sierra MK and the Hornady A-MAX's do not make the varmints explode like the V-MAX and Nosler Ballistic Tips. My friend has a 6MM Ackley Improved, and he shoots a 87grn V-MAX at around 3400 fps. When he hits a squirrel, it blows up like you would not believe. I am going with the 6-284 because I am going to be able to get around 3600 fps to 3700 fps with the 87grn V-MAX. This combination is going to be expolsive and deadly out to 1000 yards. The other bullets just don't give the explosiveness I want. I know they are better ballistically, but if I need something for longer distances I will use my 6.5x284 with the 139grn Lupa pushed at 2900 fps and better yet if I need to really reach out there I can use my soon to be completed 338 Yogi (338 Lupa Magnum Improved) pushing a 300 Sierra MK at 3000 fps. If I decide to shoot heavier bullets, I will take your advice and go with the 1-9 or 1-10 twist barrel.
Once again, thanks Dakor. It is always good to hear about other suggestions, thats why I love this site, good people, good info and good advice.
Wildcat it sounds like you know what you want and thats a good thing in life. [img]/ubbthreads/images/graemlins/smile.gif[/img] You should have no trouble getting the speed you want out of the 87 v-max and it does have a good bc of .400. There was a article on 6mmbr about a guy shooting out to 800 yards with his 6mm AI and that 87 V-max and it sounded like he was having pretty good luck with it. For that weight of bullet you are going to shoot you will want to shoot either R-19, IMR-4350, IMR-4831, and H-4831. You could try R-22 as well but I found the medium burn rate powders work better with bullets 90gr or less in the 6-284. My dad is using R-19 in his with a 80gr Berger and he is getting 3680fps out of a 24inch K&P barrel. Not bad at all and it shoots very well to boot. Well good luck with your 6-284 it is a fun round and really smacks varmits and deer hard.
I've tried all sorts of things in an attempt to get the 87gn V Max to shoot less than 1/2 MOA in my .243 AI with 9 inch twist . Gave up after using up 2 boxes .
Must say they are seriously explosive on varmints but in my rifle not nearly as accurate as some projectiles . Have had similar comments from others on various forums . Most of those who were getting acceptable results seemed to be driving them under 3300 FPS .
88 and 90gn Bergers may be worth a look too . Good luck .