6CM testing Results

[offgrid]

tbeasley,

what's your OAL, jump or jam?

Thanks, Kevin

 

[boltfluter]

Somebody needs to clarify these loads before someone blows a gun up. IMHO

Regards, Paul

What loads in this 14 or so page thread would you be referring to?
One would think common sense would dictate a person work up any new load for a particular rifle cartridge combination he may personally own.



No?

Personal testing data is just that,,,right?


49 grs. Of 4350 with 115 gr. Unfortunately in this world, commom sense isn't all that common.

Regards, Paul

 

[tbeasley]

Kevin

My match round as of now sits;
Winchester Brass
.270 tight neck chamber
use .267 Ti Bushing in a Redding .243 E-Golf Imp. Type-S FL Die
50.0 H1000
108 Berger at 2.3035 - 2.304 on ogive measurment
COAL w/108 Berger is 2.8175 - 2.818

I am jumping the bullets
My reamer is in the shop if you like to know the Freebore...wanna say .100 or .104

*** After shooting a match with 49.0gr of H1000. I shot very poorly and couldn't understand what happened. I have now just purchased the new Magneto-Chrony (a must have) and chron'd those match rounds that same day and was getting 3220 +\- w/108 Bergers. I went in my notes and found all 3200+ fps shoot poorly. I also just opened a new batch of powder too....go figure it must be that much faster.. Anyhow on page 17 I posted other results... ***

 

[Dgd6mm]

If my memory is correct tbeasley, the picture that teele1 posted of my group was a break in group at 200 yards, 107 sierra's 47 gr of H-1000 jammed. I have every bit of good success as you. That is a nice rifle you have, teele1 and mine are on Savage actions.

 

[offgrid]

Kevin

My match round as of now sits;
Winchester Brass
.270 tight neck chamber
use .267 Ti Bushing in a Redding .243 E-Golf Imp. Type-S FL Die
50.0 H1000
108 Berger at 2.3035 - 2.304 on ogive measurment
COAL w/108 Berger is 2.8175 - 2.818

I am jumping the bullets
My reamer is in the shop if you like to know the Freebore...wanna say .100 or .104

Have shorter FB. 2.131 on ogive/.015 jump. Loaded 48, 48.5, 49. 49 a slight crunch, still consistent seating.

48.5 and 49 shot well. 48.5/3148/ES 18/SD 6. 49/3186/ES 21/SD 8. No pressure signs on the 49 load. I shoot steel matches with a 3200fps max. Had a high of 3197 on the 49 load. I'll shoot the 48.5 load at a match this Saturday.

Thanks to Joe and everyone who's shared their experience with the 6CM. Couldn't be happier with my 6CM!

 

[Dgd6mm]

offgrid,
How'd it go over the weekend at the shoot for you? I haven't shot my tac rifle in a couple of months ( getting itchy to do so ) been working on the .308 FTR rifle.

 

[offgrid]

offgrid,
How'd it go over the weekend at the shoot for you? I haven't shot my tac rifle in a couple of months ( getting itchy to do so ) been working on the .308 FTR rifle.

The steel match I shot this past Saturday at CRC in Byers, Co has two start times, AM and afternoon. Shot both time slots. AM 108BT/3148 (only tested 108 loads at 100yds before match), afternoon Dtacs/3060. Shot my personal best score with the Dtacs, also high afternoon shooter. Wind was a little tougher/switchy in the 2nd match.

I was given a couple boxes of 108BT's, thought I would give them a try. I'll be sticking with the Dtacs.

 

[wesmce]

Joe,was just reading your testing results with 4350 in 6cm first paragraph loads with 4350.second paragraph h-1000 where you worked up to 49 grs just wondering if 49grs is with 4350 or h-1000.Would also like to know more about 6cm dies and a cartridge diagram and any other information.

Thanks
Wes

 

[Gundog64]

Joe,was just reading your testing results with 4350 in 6cm first paragraph loads with 4350.second paragraph h-1000 where you worked up to 49 grs just wondering if 49grs is with 4350 or h-1000.Would also like to know more about 6cm dies and a cartridge diagram and any other information.

Thanks
Wes

Lots of info here on the 6 Comp. Match
The "Search" feature is your friend.

 

[LRPV]

There is more info in this particular thread than there is in all the wading through searches you could do in a week.

 

[Timmyatnop]

Just started load developed for my 6 mm cm this last month, results are looking real good. .5 groups at 100, with new brass thats not formed till after its shot once. I got the 24 rounds down it barrels is cleaning up nice. Iam super excited.

 

[NateG]

I just placed an order with Kiff for a new reamer to use for next season's barrel. I've attached the .xls file of the print that Kiff sent me (with permission to post).

It's got the longer .104" freebore, since I'm using AICS mags (R700 action in an Eliseo RTS stock) which are a bit longer than the Tubb magazines that Joe had in mind when setting the length originally.

Also, the body is a bit wider at the case head (and the reference diameter .200" up from the bolt face) to work better with Lapua brass.

It looks like it'll be just the thing for my next barrel. (Not that there's anything wrong with the current one... I've had 100-9X strings at 600 with three different bullets, and a 10X with 115 Bergers) I'll make a bit better use of the magazine box, and will be able to use Lapua brass--weighing out the Winchester stuff is a bit tedious--and it's the difference (for my gun) of MV standard deviations of 20+ and mid single digits.

 

[rcw3]

Earlier in this thread it was suggested I copied the 6CM with my 243 Imp 30Ëš, but now I see the new 6CM design posted above dimensionally morphing toward my 243 Imp 30Ëš- - - :

People are funny.

Robert

 

[xring01]

Well I have two rifles being shipped me today that are chambered in 6 Comp Match...

Chad at Long Rifles, rebarreled my rifle with a Bartlein MTU 1:8 twist, some other work... And he cut down and rechambered my sons 6BR, to 6 Comp Match...

I just ordered the FL die from Dave Bruno... Who has a few more in stock fyi... Ordered up 200 pieces of Winchester Brass, I have a over 6-700 Berger 105 VLD's and 8-900 115 DTacs...

It will not be long, and I will be updated a thread on my load development.....

 

[Dgd6mm]

xring01, you will be well pleased.

 

[xring01]

Well today was a long day at the range...
Bought 1lb of R25, 200 rds of new winchester 243 brass.
Loaded up 80 rds of 115 dtacs, with 45 gr of R25. Seated bullets very long. for my gun... I had 3 failure to fires... Light primer hits.. Even though the bullets were jammed. The shoulders looked good...

Loaded up 77 rds of the same for my sons gun....he only had one failure to fire, light primer hit....

Did the whole barrell break in, sighting, shooting, cleaning, shooting, cleaning, shooting, shooting and cleaning, followed by more shooting and more cleaning... Maybe i exaggerated a bit...

I was easily hitting 1moa swingers at 300yds...

Looking forward to load development now...

Guess what... 1lb of powder, equals 7000 gr... Supposed to be 155 rds @45 gr... I guess they gave me alittle extra, we got 157rds...

 

[Dgd6mm]

That RL25 is tough on throats. I borescoped a .243 with under 350 rounds down it and it was UGLY. .243 Winchester brass is so irregular that even being jammed you will have a few light primer strikes. H-1000 will give you all you need for speed, but run it the way you want and enjoy.

 

[xring01]

I didnt have any H1000, the local stores only had R25, Planning to buy some H1000 tomorrow PM...

I am curious, on how you came to the conclusion that R25 is rougher on the throat than H1000, they are very close on the burn rate scale...

 

[Steve Blair]

I didnt have any H1000, the local stores only had R25, Planning to buy some H1000 tomorrow PM...

I am curious, on how you came to the conclusion that R25 is rougher on the throat than H1000, they are very close on the burn rate scale...

[br]
Reloder 25 is a double base powder. The nitroglycerine content produces more energy and a hotter burn. Whether they have deterrent coatings to burn at the same rate is not relevant.

 

[Rtheurer]

I believe what Donald and Steve are saying is that just because the powder is a slower burning powder... This does not make it easier on throats as most people asume... you know what they say about assumtions.

For example the HEAT OF EXPOSION/ POTENTIAL for H1000 is 3630 Kila Jouls/ KG ( HEAT)
While R25 is 3810 KJ/KG. Almost 200 KJ/KG less in H.O.E/P in the two powders yet they are real close in BURN RATE.

The biggest one in contrast I see is N560 Vs N160, that are within the same Manufacture even. N160 is a nice 3620 while the N560 High Energy powder is a wopping 4020!!!

Just because the powder of choice has a slow burn rate DOES NOT mean its easy on throats.

I hope i didnt mess this up.. If some one see's a mistake please jump in.
RussT