XBR-8208--Mini report

C

C.L. Peterson

Active member
Cost==$137.00/8# plus S&H plus Hazmat if applicable

Throwing charges
--Jones measurer-55.0 clicks==31.8 gr--7 throws
==31.9 gr--3 throws

Weighed with Competitive edge Dynamics small range scales
Controlled enviroment-70 degrees F--Basement of home--35%RH

--Not once did the powder measure cut any powder or hang ups while
throwing above charges

--It appears to meter as good as my other 8208 powder

Shooting Groups (3 Shot)@ 100 yards
--Conditions==Sunny-20deg F--40%RH--6"snow cover--wind 10-15 MPH
switching from 5-9 0'clock positions--Typical snow mirage
with jumping center bull
***It was difficult getting off shots in some what the same wind condition
and stopping the bull .target at the same time
--LV 6ppc rifle shot over Farley rest

--Load/groups
31.8gr==.153 and.175
31.5gr==.312 Vertical group suggesting out of tune??
30.8gr==.053, .267, .162, .204
31.1gr==.096

8 groups--cant form any conclusions yet,

except its hard to stop the shaking sitting at a concrete bench in above conditions


CLP
 
please note three things about this scale:
"This precision instrument not only measures up to 3,000 grains at 0.10 increments, a first in the shooting industry" (it would appear the sensitivity is 0.1)

"Capacity (up to) / Graduation:
3,000 grains / 0.1 gn"( it is a 0.1 scale.......just like any beam scale 0.2 variration is possible)


"Important: Due to the wide range of unit weights and capacity, this digital scale is not designed for slow precise powder trickling."( that line is straight from thier site..it means what i said in the first line..it lacks sensitivity).

your a sick sick man to go out and shoot in those conditions.....but thanks.

as your results show, inspite of the size issue, that stuff shoots!

mike in co
 
Xbr-8208

FBecigneul said:
Were those three or five shot groups?
Were all the charges thrown and weighed?
Final question, well, statement, no moving backer.
We asked all these questions of MikeInCo, why not C.L. Peterson?
Francis For Balanced Reporting
Click to expand...

Answers to above
---Three shot groups--previous reported
---Thrown and weighed
55 clicks==31.8 gr
54.5 Clicks==31.5 gr
53 Clicks==30.8 gr
54 clicks==31.1 gr
--no moving backer

Not trying to be evasive--just reporting my findings--maybe helpful/maybe not

CLP
 
C.L.
Winter up here( Davenport as well) makes us all humble.
Thanks for your 8208 report. When We are lookin at winter loads( cause we really shoot all winter long around here, no matter what) We're lookin at three or four foulers just to get the barrel up to temp, then 10 or twelve subsequent rounds of the same load until the barrel gets stupid with fouling and starts spittin.Nobody shoots their good stuff as " Old Man Winter" wins, no matter what ! Very difficult( as you realize) to get any real competitive summer time data over snow at 20 degrees F or less.
In milder temps we are lookin for a seating depth that will still drill at +/- .003 and a powder that will hang at three different numbers.I've got a feelin that this new 8208 will do just that.Just one more thing that makes Springtime seem so far away. For now,everyone around here is just burnin' up their trash,drinkin hot coffee and eatin' donuts.
One little tip. If your cleaning solvent starts to ice up you can fire up your vehicle ,put the bottle on the dash and crank the defroster setting.
Joel
 
Curious

Just a .3 change gave .300 of verticle. Even in a 3 shot group!!.

We would all hope the load window would be a little more forgiving.

Thanks for the effort. Heck, we didn't shoot last week end because it was in the low 50's. Kinda figured that was too cold to get any serious data.

We are a bunch of wimps:D..........jackie
 
jackie schmidt said:
Just a .3 change gave .300 of verticle. Even in a 3 shot group!!.

We would all hope the load window would be a little more forgiving.

Thanks for the effort. Heck, we didn't shoot last week end because it was in the low 50's. Kinda figured that was too cold to get any serious data.

We are a bunch of wimps:D..........jackie
Click to expand...

jackie, the .3 could easily be a .5 as the scale is +/-0.1.

it was probably just shivering.....


mike in co
 
Groups fired over snow on a sunny day will get you lots of verticle with
a good gun . The 5-9 wind is changing your sight picture all the time.
 
Exactly

Bob Kingsbury said:
Groups fired over snow on a sunny day will get you lots of verticle with
a good gun . The 5-9 wind is changing your sight picture all the time.
Click to expand...

That's why Doc wrote about typical snow mirage.

Now if this powder is truely the holy grail and is not temp sensitive, shouldn't it shoot just as good at 20degrees as it does at 95?

When i shot last week and the load was too hot, i had lots of horizontal. Rail gun, mirage not important.

You know Doc, for an old buzzard, you're pretty tough;)What's the deal, the little woman have a honeydo list you opted out of by going shooting?

HNY
Dave
 
FBecigneul said:
I still don't understand your math.
I'll agree with what you say about a scale possibly being off +-0.1 but I'll be darned if I can see where that figures out to .5 In my old math as taught by Sister Mary Arithmetic back in 1950, +-0.1 from 0.3 equals 0.2 to 0.4 or one up and one down.
Click to expand...

francis,
the original charge could easily be all xx.x-0.1, he goes up 0.3 and all those could easily xx.3 +0.1.....so the srpead from the first group could be (minus 0.1 plus 0.3 plus0.1...that is a 0.5 spread....

30.1(planned) 30.0 actuall
30.4(planned) 30.5 actuall
.5 spread.....since it was three shot groups and his own technique showed .1 variation its quite possible.

mike in co
 
Dave

The day I did my test,I was hoping for a day that went from 50 degrees to about 75, but it never got above 53, overcast and damp.

I shot my Sporter the last time out, it was still 53 degrees, but bright and sunny. A front had come through, the air was really dry for Houston.

I was locked into a bullet holes worth of verticle all day. I could not even get it out with the tuner, went into three load windows. I put my favorite low humidity load of 133 in, (which means lots), and shot a couple of nice "ones".

I said it in my originol post, I think this new stuff is on the slow side. Regardless of the density, it takes darned near 1.5 more grns of it to make the same velocity as a typical lot of 133. Keep in mind, the difference between N13O and 133 is is just a little over 2 grns in a 6PPC.

I also had an average 70 fps drop in velocity from a 23 1/2 Unlimited Barrel to a 21 1/2 inch Sporter Barrel. With 133, I can expect no more than 20-30 fps difference.

I have not got my shipment from Brunos yet. I really need a warmer day to test, as the vast majority of our shooting is done in the 80+ degrees.

I think what we are all going to find out is that the new powder will require the same dilegence in finding a load. But, what we are all HOPING FOR is that once we find what it likes, it won't go crazy at the drop of a hat, .......jackie
 
Iowa Winters-I remember well

C.L. Peterson said:
Cost==$137.00/8# plus S&H plus Hazmat if applicable

Throwing charges
--Jones measurer-55.0 clicks==31.8 gr--7 throws
==31.9 gr--3 throws

Weighed with Competitive edge Dynamics small range scales
Controlled enviroment-70 degrees F--Basement of home--35%RH

--Not once did the powder measure cut any powder or hang ups while
throwing above charges

--It appears to meter as good as my other 8208 powder

Shooting Groups (3 Shot)@ 100 yards
--Conditions==Sunny-20deg F--40%RH--6"snow cover--wind 10-15 MPH
switching from 5-9 0'clock positions--Typical snow mirage
with jumping center bull
***It was difficult getting off shots in some what the same wind condition
and stopping the bull .target at the same time
--LV 6ppc rifle shot over Farley rest

--Load/groups
31.8gr==.153 and.175
31.5gr==.312 Vertical group suggesting out of tune??
30.8gr==.053, .267, .162, .204
31.1gr==.096

8 groups--cant form any conclusions yet,

except its hard to stop the shaking sitting at a concrete bench in above conditions


CLP
Click to expand...
Ha Cecil,
How did you shoot those groups while freezing your a$$ off. Did you time it between shivers?? -----Bill :D
 
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