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6mm Rem+superformance+70gr results

 
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  #1  
Old 03-07-2011, 01:55 PM
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6mm Rem+superformance+70gr results

I just got a chance to try superformance the first time yesterday in my custom 6mm Rem with a 25" 1 in 9 Kreiger barrel. I worked up to a max load of 54gr from their website and the 6 rounds I fired averaged 3824fps. All stayed within 33fps variation except one that I let sit in a hot chamber while waiting for wind to die down. All 6 shots went under 3/4", with 5 within 1/2". I used the 70gr ballistic tip. It's not the best bullet for dialing in at extreme ranges, but it should allow center holds on coyotes to 350yds without adjustment. Heavier 75gr bullets topped out at 3550fps with 50gr of powder in my testing. I have not yet tried anything heavier, if they get more load data out I'd like to try this powder with a 90gr accubond. A 90gr accubond pushed around 3300fps would be a great all purpose load to build a turret for.

Has anyone else tried this powder yet?
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  #2  
Old 03-07-2011, 02:44 PM
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Re: 6mm Rem+superformance+70gr results

Quote:
Originally Posted by mcseal2 View Post
I just got a chance to try superformance the first time yesterday in my custom 6mm Rem with a 25" 1 in 9 Kreiger barrel. I worked up to a max load of 54gr from their website and the 6 rounds I fired averaged 3824fps. All stayed within 33fps variation except one that I let sit in a hot chamber while waiting for wind to die down. All 6 shots went under 3/4", with 5 within 1/2". I used the 70gr ballistic tip. It's not the best bullet for dialing in at extreme ranges, but it should allow center holds on coyotes to 350yds without adjustment. Heavier 75gr bullets topped out at 3550fps with 50gr of powder in my testing. I have not yet tried anything heavier, if they get more load data out I'd like to try this powder with a 90gr accubond. A 90gr accubond pushed around 3300fps would be a great all purpose load to build a turret for.

Has anyone else tried this powder yet?
I just looked in the Speer manual, and two Hornaday manuals, and all I can say is WOW! That's almost 200fps faster than 4064 in the AA manual, and over 300fps faster than the Speer or #7 Hornaday manual (the older one showed 3600fps). Now this combo sounds just about right for those old Berger 88LD's
gary
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  #3  
Old 03-07-2011, 07:30 PM
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Re: 6mm Rem+superformance+70gr results

Yeah, Hodgdon lists the load I'm using at 3812fps with a 70gr Sierra matchking. I had every intention of using 85-100gr bullets in this rifle, but after reading that I just had to try it. I wanted an all-around load to build a turret for, but I'm going to play with this one for a while before I make up my mind. They say it only cranks the velocity in specific cases with specific bullet weights and that is why the load data is so limited.

I've not tried the 88gr bergers, have you used them on deer or coyotes?
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Old 03-08-2011, 12:17 PM
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Re: 6mm Rem+superformance+70gr results

Quote:
Originally Posted by mcseal2 View Post
Yeah, Hodgdon lists the load I'm using at 3812fps with a 70gr Sierra matchking. I had every intention of using 85-100gr bullets in this rifle, but after reading that I just had to try it. I wanted an all-around load to build a turret for, but I'm going to play with this one for a while before I make up my mind. They say it only cranks the velocity in specific cases with specific bullet weights and that is why the load data is so limited.

I've not tried the 88gr bergers, have you used them on deer or coyotes?
the 88 grain LD is a difficult bulet to stabalize for some reason, and thrives on velocity. I tried them in two 6mm's that had 1:9 twist, but simply couldn't spin them fast enough. I was getting about 3425fps out of them using a very old lot of .257 cases (these hold about a grain and a half more powder than standard 6mm cases.). But with the same twist rate barrel I could shoot them in my 6AI. They're a legitament 900 yard round in the 6AI. If you could get 3550fps with a regular 6mm, you ought to be able to shoot them just fine. Or better yet with an eight twist barrel. They like 180K rpm on impact

Just a note: as fast as the 70 grain bullet is with that powder, the same bullet out of a 6 Vias will break the 4000fps mark with ease!
gary
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Old 03-08-2011, 04:55 PM
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Join Date: Apr 2010
Location: East Central Indiana
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Re: 6mm Rem+superformance+70gr results

Here is what I ended up with a 55G accutip. I posted this a few weeks back. 22-250

Savage 12bvss 26" CM 12 tw PRVI case,55g Accu-tip 2.410" oal.
40.0=3427 41.5=3623 43.4=3851
40.0=3367 41.5=3613 43.4=3875
40.0=3418 42.0=3642 44.0=3975
40.0=3427 42.0=3663 44.0=3968
40.0=3418 42.6=3724 44.4=4065
40.6=3467 42.6=3755 44.4=4052
40.6=3454 43.1=3798
41.0=3527 43.1=3756
41.0=3454

The 44.0 loads just started to show a tiny bit of flow around the firing pin,they didn't look flattened out yet just raised ever so slightly around the pin mark. the 44.4g loads were a little worse yet but didn't look too bad. At 44.4g the case was filled to about .060" below the mouth,not much room left at all and really compressed.



I'm running up some 155 amax in 308 but haven't had a chance to get back out yet. Also some 69g match in my 22-250.
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  #6  
Old 03-09-2011, 10:25 AM
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Re: 6mm Rem+superformance+70gr results

Got a double on yotes this morning off a cow carcass. We had one prolapse a couple days ago and lost her. Anyway, I shot the first at 124yds through the lungs and the 70gr BT exited through the far shoulder. The second started slowing up at 275yds so I took time to set up my X-bag on the roof of the Polaris Ranger, shot from the bed. It stopped at 342yds and looked back, that bullet didn't exit. I ranged the Polaris from the dead yotes no time to range before shooting. It was sure nice not to worry about holdover, and the wind while strong was in my face. The BT must have held up well at the high velocity to exit at 124yds through the shoulder.
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Old 03-09-2011, 11:25 AM
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Join Date: Jun 2010
Location: greenwood, IN
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Re: 6mm Rem+superformance+70gr results

Quote:
Originally Posted by mcseal2 View Post
Got a double on yotes this morning off a cow carcass. We had one prolapse a couple days ago and lost her. Anyway, I shot the first at 124yds through the lungs and the 70gr BT exited through the far shoulder. The second started slowing up at 275yds so I took time to set up my X-bag on the roof of the Polaris Ranger, shot from the bed. It stopped at 342yds and looked back, that bullet didn't exit. I ranged the Polaris from the dead yotes no time to range before shooting. It was sure nice not to worry about holdover, and the wind while strong was in my face. The BT must have held up well at the high velocity to exit at 124yds through the shoulder.
with a 1:9 twist barrel, I've yet to have a bullet anymore destructive than the 80 grain Sierra Blitz. At 200 yards it will often bi-sect a dog with a shoulder hit. I have had dogs running away from me take hits at close to 200 yards, and literally do a double flip in the air. But the 88 grain Berger will smoke a coyote at 750 yards with ease if you can stabalize it. They also did a 69LD grain bullet, and I couldn't make it shoot in anything! But a buddy and I did a swap, and his 6BR seems to shoot them fairly well.
gary
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