New .284 Shehane

"Donp" had his 30" 284 over last week and we spent the day load developing using 180 VLD's and Matrix 190 VLD's.

We tried RL17, 4831, 4350 and N560 and top velocities only just squeaked past 2900 but they lacked accuracy.

The most accurate loads were 55-56 grains of N560 and the 190 Matrix into the lands 15 thou. Velocities were about 2850. More fine tuning to be done, but his RKS barrel had some bug hole groups at slow nodes, so the barrel is fine.

I have to give a gratuitous plug to Matrix Bullets. I have used their 6mm 107's and they are as good a bullet as I have ever used in a 6BR. 100% Canadian and can be bought on-line.
 
Ian

So on that statement "I have to give a gratuitous plug to Matrix Bullets. I have used their 6mm 107's and they are as good a bullet as I have ever used in a 6BR. 100% Canadian and can be bought on-line."

Is this the alternative to Berger 105's with the lesser BC.


cheers

BuckyR:d:
 
Most definitely, I quite dislike the new Berger VLD's and have 800 of them collecting dust. I would trade them for old VLD's or new hunting match bullets in a heartbeat.

You SHOULD try the Berger 105 Hunting match bullets though, they are superb.
 
Obtunded said:
Most definitely, I quite dislike the new Berger VLD's and have 800 of them collecting dust. I would trade them for old VLD's or new hunting match bullets in a heartbeat.

You SHOULD try the Berger 105 Hunting match bullets though, they are superb.
Click to expand...

I would go for the Hunting 105's if I new where I could get some, what about the 108's ...not much talk about them....? no good ,not bad, won't cut the mustard with the 105's.

still disappointed the SMK 107's are such a pain , only have 300 in my inventory so its time to look for something else to shoot.

Cheers

BuckyR:d:
 
Obtunded, I would contact Berger directly and give them your thoughts. maybe they will trade them for you????

Tack 243, I have just sold out (1box left) of the 105 huntings and will be booking more. How many do you want?

The 108's are working very well for some shooters. As with all rifles, feed it what it likes. Some thrive on the 105 Hunting, others the 108's. Test both and it will be very obvious which it prefers.

At the distances we shoot in BC, any diff in BC is not worth mentioning between these two bullets. They will both work superbly in a 6BR.

I have some 108's on hand.

Can also get Sierra, Nosler, Lapua, etc, etc, etc.

Let me know...

Jerry
 
CyaN1de said:
Looking to be in the 2950 range once the brass is fireformed. I may have to sacrifice my 1.5lbs of 4831SC to see how she does in the meantime. Obviously the 4831SC works in the .284 case well since almost everyone shooting it uses that powder.
Click to expand...

With so little 4831sc powder available it might be prudent to wait until you could get enough to have some decent testing or you could do a ladder test to see where 4831sc takes you towards your velocity goals. if your current lot can't get you there then allot more of a different lot would most likely have similar results.
Each gun is different..bring a bullet puller...:)
 
Trevor60 said:
With so little 4831sc powder available it might be prudent to wait until you could get enough to have some decent testing or you could do a ladder test to see where 4831sc takes you towards your velocity goals. if your current lot can't get you there then allot more of a different lot would most likely have similar results.
Each gun is different..bring a bullet puller...:)
Click to expand...

I just found a few pounds today....not in my hands yet...but soon will be :)
 
mysticplayer said:
Obtunded, I would contact Berger directly and give them your thoughts. maybe they will trade them for you????

Tack 243, I have just sold out (1box left) of the 105 huntings and will be booking more. How many do you want?

The 108's are working very well for some shooters. As with all rifles, feed it what it likes. Some thrive on the 105 Hunting, others the 108's. Test both and it will be very obvious which it prefers.

At the distances we shoot in BC, any diff in BC is not worth mentioning between these two bullets. They will both work superbly in a 6BR.

I have some 108's on hand.

Can also get Sierra, Nosler, Lapua, etc, etc, etc.

Let me know...

Jerry
Click to expand...

Thanks for the incite, I do have about 500 108's I want to try once I use up the 107's .I have shot great groups with them the first time I tried them with Reloader 15 , they may be just what I am looking for, but I need to test them first with Varget. I will let you know when its time to get more, thanks again.

Cheers

BuckyR:d:
 
I apologize If I may have stoled your post Richard,things got away. I hope you have all the best luck a man can have in the development of your new rifle. I wish I could keep up with you.

Cheers

BuckyR:d:
 
Bucky,

Get 105 hunting match bullets. The 108's are marginally slower and have less BC. The HM Bullets WILL work. Jerry has them and so does Dave Friesen, Paul Reibin, reliable gun and tackle.

I have had more 6BR barrels that I can count now and the 105 Berger VLDs worked in everything. Also, the Matrix 107's are a fantastic bullet too.

Another record falls to Krieger and 6mm 105 VLD's.... they work.
 
Very nice report.

I had been considering a 280AI - aside from action length, would there be a material difference between the two on the range?
 
Obtunded said:
Bucky,

Get 105 hunting match bullets. The 108's are marginally slower and have less BC. The HM Bullets WILL work. Jerry has them and so does Dave Friesen, Paul Reibin, reliable gun and tackle.

I have had more 6BR barrels that I can count now and the 105 Berger VLDs worked in everything. Also, the Matrix 107's are a fantastic bullet too.

Another record falls to Krieger and 6mm 105 VLD's.... they work.
Click to expand...

Thanks Ian good advice like always, I will break down and get some 105's in the near future once I have worked on the 108's, by that time I may have to get the barrel set back and start over.....HEHE:dancingbanana: good practice.

Cheers

BuckyR:d:
 
Andy said:
Very nice report.

I had been considering a 280AI - aside from action length, would there be a material difference between the two on the range?
Click to expand...

This is a cartridge I have been eyeing very very carefully. "Bingo101" has done a couple and by his accounts they are tack drivers AND have 2900+ velocity with great barrel life. You're right in that the action is different, and being almost universally a short action kinda guy, this represents the one and only reason I have not built one.

It's coming....

the buckydude.... said:
Thanks Ian good advice like always, I will break down and get some 105's in the near future once I have worked on the 108's, by that time I may have to get the barrel set back and start over.....HEHE good practice.
Click to expand...

I was gonna say, you have been chompin' on that gun pretty steady! You're gonna have to drag your good lady out to these parts in August for some rodent slayin', brain cell massacreing, moonshine swillin' hillbilly quality time. We'll get your gat punching bug holes!

Ian
 
Andy said:
Very nice report.

I had been considering a 280AI - aside from action length, would there be a material difference between the two on the range?
Click to expand...

I put together a 280AI variant a few years back when looking at LONG RANGE F Open stuff and the then new 7mm 180gr VLD. I did this because there was a magnum ban in F Open at that time.

Anyways, the cartridge did indeed work very well. Because of the dies I had, I moved the shoulder forward to the same location as the 7RM. Increases case capacity a bit too. Not as agressive as a Gibbs so you have lots of neck length to work with.

You end up with a case capacity within spitting distance of the 7RSAUM. A case I feel has the ideal volume for this cal/bullet weight. Not surprisingly, similar loads give similar performance.

Called it the 7 Mystic.

In a 24" Shilen 9 twist, I had no problem reaching 2835fps with tolerable pressures. The performance of these 180's was tangibly better then my 6.5 Mystic (pushing 139gr Scenars at around 2925fps) at 1000m.

Used it to win the Sidley Hunter class 1000m fun shoot a few years back

In a longer 30" barrel, I would expect tickling 3000fps as a real possibility. At the very least, you should get comfortably over 2900fps without any pressure issues at all.

I did look at the 284 case and decided against it. I am not a big fan of pressures over 65000psi and I didn't think the smaller 284 case, even if improved, was going to get the job done.

From a mag, it definitely needs a LA but for F class and a single shot, a Savage SA will work.

If I were to put another 7mm together, I would certainly look at either my 7 Mystic or 7RSAUM. If using a Rem SA, I would just go 7RSAUM or one of the improved variants that is sure to follow.

My RSAUM wildcat would have a 40deg shoulder.

I think the WSM family is great too but maybe too much of a good thing.

Like all 'magnums', don't expect long barrel life. Peak life around 1000rds.

Jerry
 
I keep looking at all these wildcats, and thinking- 7rsaum. lots of neck, Norma brass, velocity envelope easily reached w/o drama in a short action. Probably make it work w/ temp stable H4831 SC.
 
mpwolf, yep, it's the no brainer solution. Just have to neck down 300RSAUM which is ideal for neck prep anyways. Nosler and Rem would be the other options

H4831SC is what I shot in my 7 Mystic. worked great.

Jerry
 
I was gonna say, you have been chompin' on that gun pretty steady! You're gonna have to drag your good lady out to these parts in August for some rodent slayin', brain cell massacreing, moonshine swillin' hillbilly quality time. We'll get your gat punching bug holes!

Ian

I like it I like it.
All of the above sounds like way too much fun,I'll pass it by the hillbilly wife and see what we can do to make this happen.

Only the lonely are the ones with no friends. Don't know were that came from......

Cheers

BuckyR:d:
 
Jim Murphy in the US has already done the 7RSAUM with 40 degree shoulder. He had good results but I haven't seen any additional comments from him on this caliber in a few years. If I recall correctly PTG did his reamer.

comments from Jim Murphy "I shot a 7mm RSAUM with a 40 deg. shoulder and tight neck in the team match at the F-class Nationals (Trevor this was back in 2006) last weekend. 200-10x had a little vertical, I am still working on loads and bullet seating of the 175 Sierra's. I had the bullets about .010 in the lands, It 's 3010 fps now may try a little slower and see if it settles down. Might shoot it at Butner the end of the month and jump them about .010"
I am using 62grs. H4831sc 180 Berger Molyed, 2975fps, Broughton 1-9 twist.
Case in full up to the shoulder, tried slower powder, but not as good as H4831sc.
Some say that a 8 twist would be better, I might try a 8.5 on my next barrel if I stay with the 7mm.
I use .0015 neck tension now, the last check over the chrony was ES under 20fps, but will check again when weather warms up to at least 50 deg

Jim"


What I like about it over others is the ability to load down to 3000 fps instead of having to run compressed load to get up to 3000. From my research it is a far better and more efficient cartridge then the 7wsm in longer barrels….I do like the longer neck as well.

yet one more 7mm alternative... I was chatting with a South African chap and he told me about the 7mm Tombi it was used in the 2005 South Africa F Class championships Neck is much longer than the .284 though, barrel life (for those whom it matters) better than .284. Velocity with local propellant (comparable with your 4831sc) it is easy 3000fps with 175gr SMK or 180gr Berger, some go to 3100, but that's on the edge. Usually shoots around 2950 with some margin to spare. it is based on a slightly shortened and improved 30-06 case, capacity close to that of the straight .284 Winchester (Tombi is 62 grains of water when filled to the base of the shoulder).

Not to leave the 284 shehane out as the initial post was based on the 284 S. you may want to get in touch with Gord.

Trevor
 
I shoot a 280 AI. Other than the lack of good brass it has been an exellent cartridge. I fire form federal brass and can get around 8 reloads before the primer pockets get loose. I took it to Burns Lake this year and stretched her legs. I've never shot past 400 before. I shot in the heavy barrel class and put 4 into a nice 5" group. The fifth made it 12". In the unlimited class I put 10 in a 13 3/4" group. It was alot of fun. I can't wait till next year. 11 of the 15 shots only had 5" of vertical. With all 15 it had 8" of vertical. I have around 1200 rounds through it now and it's still shooting 1/2 moa if I do my part.
 
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