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#1 wabbit evaporator

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Posted 12 November 2012 - 10:20 AM

I am about to have an RPA action of mine rebarelled into 6mm-284. Does anyone have any experience of this calibre and would be able to suggest a 'smith who has worked with it and would be a good suggestion for the work? Cheers in advance.

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#2 Elwood

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Posted 12 November 2012 - 12:29 PM

I know Vince Bottomingly used one for 1000 yard benchrest, barrel life was short.

I also know several people that have had rifles built for F class in this chambering, but none of them have shot particularly well?

When I questioned someone with far more experience of ballistics than I have, they told me that in their opinion the powder column was to large? However Vince did manage to get his shooting.

I'm not sure of your intended purpose for the rifle? But I think I would be looking at the 6mm AI, you will only be giving up a small amount in velocity and you will have to fire form your cases, but take it from me fire forming loads in this caliber are seriously accurate as are the formed loads.
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#3 wabbit evaporator

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Posted 12 November 2012 - 12:53 PM

Thank you for the replies. I wasn't aware that it was a particularly difficult calibre to load for. I shot a mate's BAT actioned rifle in this calibre last year with 75grn VMAX (I think) the thing was silly accurate, comfortably shooting into .3moa at 200 yards. Not too concerned about barrel life but I am looking for silly velocity in about the 75grn bullet weight-class. I was fairly set on this calibre but am all ears to suggestions.

#4 Elwood

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Posted 12 November 2012 - 01:10 PM

Thank you for the replies. I wasn't aware that it was a particularly difficult calibre to load for. I shot a mate's BAT actioned rifle in this calibre last year with 75grn VMAX (I think) the thing was silly accurate, comfortably shooting into .3moa at 200 yards. Not too concerned about barrel life but I am looking for silly velocity in about the 75grn bullet weight-class. I was fairly set on this calibre but am all ears to suggestions.


Well you can't argue with 0.3 MOA at 200 yards, I think I would be asking your friend who chambered his rifle? You should be able to get easily 3700+ fps with a 75grn Vmax.

The main attraction for me with this caliber is Lapua brass and very limited case forming, unlike the 6mm AI.

Perhaps Vince will share his experiences with you, but he would have had his chamber suited more towards heavier 6mm bullets.

Keep us informed of what you decide?
Ian

#5 Danpd

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Posted 12 November 2012 - 01:11 PM

I've had one. It was finicky to get to shoot and throat was heavily firecracked after 100 rounds. You will also need to have a tight neck chamber, as the brass is excessively thick and inconsistent at the neck.

You would be much better served with a 243 ackley if all you want to do is launch varmint bullets at silly speeds IMHO

The 6-284 is at its best pushing high BC pills at decent speeds, with very impressive ballistics. Using varmint bullets in it is a bit pointless, as the are Crap in the wind, and bleed velocity rapidly, turning a 1000yd hammer into a 400yd nutcracker.

#6 wabbit evaporator

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Posted 12 November 2012 - 01:18 PM

Sadly his was built over in the States which was the route I was going to go down until I ran into an absolute minefield of red-tape and expense! His rifle is still going strong with just over 1000 rounds down the tube although I know he's now thinking about a re-barrel- I am using this for long range vermin and so don't anticipate putting thousands of rounds down it in a short space of time. I will have a look at 6mm AI and .243 AI but I was really trying to avoid the fire-forming. Again, thanks for the replies.

#7 6.5shooter

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Posted 12 November 2012 - 01:29 PM

I think smokin on here has one.
6x47 is another great alternative! I considered the 6-284 myself but went for the 6x47. Glad I did!
Dont wait for youre ship to come in! Swim out to meet it!

#8 abolter

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Posted 12 November 2012 - 01:31 PM

I think that Steve Kershaw has built a couple if that is any help

#9 sussexsteve

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Posted 12 November 2012 - 01:44 PM

Looked at 6mmai and 243ai . I didn't want any fire forming so am going 6x47 . Get to use my favourite Lapua brass
Atb Steve
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#10 1967spud

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Posted 12 November 2012 - 02:12 PM

still need to fireform this one as necking down wont set the shoulder properly where fire forming will

Shoot it ....Reload it !! Here


#11 243ack

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Posted 12 November 2012 - 03:28 PM

Dannyt on here has the reamer - and is on your (parents?) doorstep!!.

#12 1967spud

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Posted 12 November 2012 - 03:45 PM

Dannyt on here has the reamer - and is on your (parents?) doorstep!!.


+1 for danny not a nicer chap to deal with

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#13 wabbit evaporator

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Posted 12 November 2012 - 05:51 PM

I've had one. It was finicky to get to shoot and throat was heavily firecracked after 100 rounds. You will also need to have a tight neck chamber, as the brass is excessively thick and inconsistent at the neck.

You would be much better served with a 243 ackley if all you want to do is launch varmint bullets at silly speeds IMHO

The 6-284 is at its best pushing high BC pills at decent speeds, with very impressive ballistics. Using varmint bullets in it is a bit pointless, as the are Crap in the wind, and bleed velocity rapidly, turning a 1000yd hammer into a 400yd nutcracker.


Now I am having doubts!!

I want a rifle for informal messing about at long range. 300- 1000 yards at home and other places where I am able to shoot rabbits, crows and the like. I want a light for calibre bullet to get the frangibility, whilst there's no substitute for a safe back-stop I like the thought of 75grain fast as light explosive pills. At what range do you think higher b.c bullets take over (in the real world) and if you were me what would you go for?? My absolute priority is accuracy but a close second is that explosive red-mist/safety that comes with ultra-high velocity frangible bullets.

#14 Elwood

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Posted 12 November 2012 - 06:05 PM

Now I am having doubts!!

I want a rifle for informal messing about at long range. 300- 1000 yards at home and other places where I am able to shoot rabbits, crows and the like. I want a light for calibre bullet to get the frangibility, whilst there's no substitute for a safe back-stop I like the thought of 75grain fast as light explosive pills. At what range do you think higher b.c bullets take over (in the real world) and if you were me what would you go for?? My absolute priority is accuracy but a close second is that explosive red-mist/safety that comes with ultra-high velocity frangible bullets.


Best of both worlds is the 87 grain Vmax.
Ian

#15 wabbit evaporator

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Posted 12 November 2012 - 06:26 PM

Fair point- thank you.

Can I clarify whether or not this case will need fire-forming after necking down? I didn't think so.......

#16 garyw

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Posted 12 November 2012 - 06:27 PM

i had a 6-284 that was built by callum f.not for me but someone else i bought it from him last year.this was chambered to use lapua brass-BUT-callum ran the reamer in short-0.300 this this was intended as the brass 6.5x284 was to be formed short-this was done with a neil jones forming die and 6 bushings :wacko: the overall cartridge was reduced- neck turned and fire formed .problems arose with lapua brass as the base of the case above the web became to tight to chamber-steve dunn made a die to reduce the case at the base and it shot really well.
i used the calibre for f class when i first started and all was well until the brass after 4 firings would not reduce at the base.this became a big P.I.T.A .
velocity was 3300 fps with a 105 berger vld with -h4831sc accuracy was excellant as the previous owner who some of you will know-simon austin :wacko: hit the diggle egg on more than one occasion.the straw that broke the camels back came when shooting a 1000yd f class match i got a case stuck and efforts to remove it resulted in the bolt handle on a panda action spinning off into the diggle grass :o vince b kindly resoldered that back -time for change!
so i got peter walker to rebarrel to 6x47 and get the same velocity better case/barrel life
all the aggro wasnt worth it with the short version 6-284.
just actually bought a 6.5x284 for f class and 1000yd br.

#17 Danpd

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Posted 12 November 2012 - 06:32 PM

Well as a quick and rough example,

A 75gr Vmax launched at 3750 fps will have @ 400yds 12.7 Inches Drop, 10.11 Inches Wind Drift @ 10mph, Velocity of 2524 Fps, and 1061 Ft Lbs of Energy

An 87gr Vmax Launched at 3550 fps will have @ 400yds 13.31 Inches Drop, 8.63 Inches WInd Drift @ 10mph, Velocity of 2558 Fps, and 1263 Ft Lbs of Energy

A 105gr Amax Launched at 3270 fps will have @ 400yds 14.94 Inches Drop, 7.43 Inches Wind Drift @ 10mph, Velocity of 2506 Fps and 1464 Ft Lbs of Energy

So whilst the lighter bullets start off at screaming velocities, at only 400yds the heavier slower Amax is only 50fps slower, 2 inches less flat, 2 inches better off windage wise, and retains 30% more energy.
The further you go out the bigger the disparity and all of a sudden your warp speed bullets seem quite weedy.

I think you need to decide whether you want to vaporise things at up to 300 yds, or if you want to increase your chances of a lethal centre mass hit at extended range, because you cant really do both.






#18 SteveW

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Posted 12 November 2012 - 06:42 PM

I have a 6mm/284, originally built by Callum, this was a 1:14 Kreiger and it shot 68g Barts at over 4000fps, even saw over 4100fps on the chrony, the loads were all safe in this rifle, using copious amount of N160

I have had it rebarreled with a 1:10 Truflite by Dave @ Valkyrie (Baldie) shoots superbly. I use it with 95g Partition's or SST's at between 3500/3600 fps, with N560.

I believe Vince shoots or shot a shortened version of the big 6, shortened by .100" I think?? Hopefully he will be along shortly to clarify.

Steve

#19 jcampbellsmith

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Posted 12 November 2012 - 07:30 PM

... I will have a look at 6mm AI and .243 AI but I was really trying to avoid the fire-forming..


I have a 243 Ackley for sale and dies and brass available if you don't want to re-barrel it. http://www.gunstar.c...e-gs103522.aspx

It's not hard to shoot Lapua brass and then just reload it.

Regards JCS

#20 Ro6.5

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Posted 12 November 2012 - 11:41 PM

I have a 6-284 built by Steve kershaw. I had the reamer made by PTG and throated for 70g blitzking running a 1-14 twist barrel it runs at 3950fps and brilliantly accurate out to 700 yards! then it starts to wander a bit. I have had a lot of rifles in a lot of different calibers but this 6-284 is they most fun rifle I have ever used! I had it built in June I'v put 450 rounds through it, shot probably in exes of 70 foxes a lot of crows, alot of deer, head shots out to 450 yards. It is like a laser out to 350 yards! I can't see myself been without one! Thay are a doddle to load for just run 6.5 lapua brass through a 6mm full lenth die and away you go! And the red mist is a bonus!




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