6CM testing Results
- Thread starter joesr
- Start date
I ve got a Broughton 1 in 8 blank sitting in a closet. You guys are making me seriously consider clambering it in 6CM. I have been playing with a 6x47 Lapua and have just not been over the moon about it. This would be a 600-1000 yd gun setup to shoot slung with irons.
I've had Chad Dixon work on my Palma gun and he did a fantastic job. Anyone know what reamers Chad has in 6CM?
I've had Chad Dixon work on my Palma gun and he did a fantastic job. Anyone know what reamers Chad has in 6CM?
Hey Guys,
Sounds like this is a great round. 8) Is there a plan, if for some reason, H1000 will not shoot in a particular rifle. Sounds like the H1000 is the key to the long barrel life. Considering the round and just curious. Thanks in advance. ;D ;D
Regards, Paul
www.boltfluting.com
Sounds like this is a great round. 8) Is there a plan, if for some reason, H1000 will not shoot in a particular rifle. Sounds like the H1000 is the key to the long barrel life. Considering the round and just curious. Thanks in advance. ;D ;D
Regards, Paul
www.boltfluting.com
rcw3
Site $$ Sponsor
This thread has over 10,000 views and 9 or more pages of responses, but I don't see anything addressing an issue using H1000 as a powder and I wonder why?
Getting back to the original posting starting this thread was the use of 49 gr, 50 gr, and 51 gr. of H1000 in the 6CM. I am wondering how people are loading those loads without putting the loads under heavy compression (which I personally won't do).
I have worked with the 243 Imp 30Ëšand the 6CM and they are very close in capacity (6CM 55.30 gr. water capacity and 243 Imp. 30Ëšhas 55.96 gr. water capacity).
With both those cartridges I pretty much confined my use of H1000 to between 47 - 48 gr of H1000 because that's about how much room was available for use with them without seriously crunching powder when you seat a bullet. In reality, with most barrels, 47 - 48 gr of H1000 gets you in the 2950 - 3000 fps range with the bigger 6mm bullets and that's plenty - besides, I never found running crazy fast loads very helpful for accuracy or consistency (i.e. there are no points for bullet drag racing).
51 gr of H1000 in the 6CM comes right to the mouth of brass (you don't even need a powder measure, just the fill the case up level to the mouth of the case) so any load you make with any bullet is under compression and if you take a DTAC 115 and try to load it magazine length I don't see how you can do that without practically standing on your press handle.
Here's a pic of 49 gr. of H1000 and 50 gr. of H1000 in the 6CM and the 243 Imp. 30Ëš. The 49 gr. load sits at the junction of the neck and shoulder of the case and the 50 gr loading sits halfway up the neck of the brass (brass was loaded and the cases tapped few times so powder would settle).
If you take the reamer print shown on this thread, bullets like the Sierra 107 and the DTAC 115 hit the lands at around 2.825" - 2.840", so if you load with .040" jump that means the loaded rounds are right around 2.785" - 2.800" OAL (i.e. Sierra 107's have about .050" of the bearing surface plus the boat tail back in the case below the neck and DTAC 115's have about .120" of the bearing surface plus the boat tail back in the case below the neck).
Maybe I "just don't get it" or maybe people are overlooking an issue I see as relevant but others don't.
Robert
Getting back to the original posting starting this thread was the use of 49 gr, 50 gr, and 51 gr. of H1000 in the 6CM. I am wondering how people are loading those loads without putting the loads under heavy compression (which I personally won't do).
I have worked with the 243 Imp 30Ëšand the 6CM and they are very close in capacity (6CM 55.30 gr. water capacity and 243 Imp. 30Ëšhas 55.96 gr. water capacity).
With both those cartridges I pretty much confined my use of H1000 to between 47 - 48 gr of H1000 because that's about how much room was available for use with them without seriously crunching powder when you seat a bullet. In reality, with most barrels, 47 - 48 gr of H1000 gets you in the 2950 - 3000 fps range with the bigger 6mm bullets and that's plenty - besides, I never found running crazy fast loads very helpful for accuracy or consistency (i.e. there are no points for bullet drag racing).
51 gr of H1000 in the 6CM comes right to the mouth of brass (you don't even need a powder measure, just the fill the case up level to the mouth of the case) so any load you make with any bullet is under compression and if you take a DTAC 115 and try to load it magazine length I don't see how you can do that without practically standing on your press handle.
Here's a pic of 49 gr. of H1000 and 50 gr. of H1000 in the 6CM and the 243 Imp. 30Ëš. The 49 gr. load sits at the junction of the neck and shoulder of the case and the 50 gr loading sits halfway up the neck of the brass (brass was loaded and the cases tapped few times so powder would settle).
If you take the reamer print shown on this thread, bullets like the Sierra 107 and the DTAC 115 hit the lands at around 2.825" - 2.840", so if you load with .040" jump that means the loaded rounds are right around 2.785" - 2.800" OAL (i.e. Sierra 107's have about .050" of the bearing surface plus the boat tail back in the case below the neck and DTAC 115's have about .120" of the bearing surface plus the boat tail back in the case below the neck).
Maybe I "just don't get it" or maybe people are overlooking an issue I see as relevant but others don't.
Robert
Robert,
I will try and answer your question based on my use of the 6CM.
1st I don't know how many of the posters are running the 6 CM in a repeater. I am having one built now on a Barnard SM but will limit the bullets to 105 gr. All of my experience so far has been in a single shot (Barnard P) for Mid and long range matches.
2nd. You may not like to hot rod your guns ( I don't either) but many others do. I too have found when really pushing the limits that accuracy does usually suffer. I will take an accurate load over speed all the time. My loads also stay in the 47-48 gr range. Never really see the need to push beyond what works. I have found the 6CM to be a very easy cartridge to work with. .5 MOA is very easy to attain with many different bullet weights.
I have run compressed loads in my service rifle with no problems but that issue seems to come with the 223 when running heavy bullets, especially mag length with Sierra 77's. Not a heavy compression but there is a bit of crunching when seating bullets. I don't have a problem with some load compression but going over 50 grs in the 6CM is not something I want to do.
I will try and answer your question based on my use of the 6CM.
1st I don't know how many of the posters are running the 6 CM in a repeater. I am having one built now on a Barnard SM but will limit the bullets to 105 gr. All of my experience so far has been in a single shot (Barnard P) for Mid and long range matches.
2nd. You may not like to hot rod your guns ( I don't either) but many others do. I too have found when really pushing the limits that accuracy does usually suffer. I will take an accurate load over speed all the time. My loads also stay in the 47-48 gr range. Never really see the need to push beyond what works. I have found the 6CM to be a very easy cartridge to work with. .5 MOA is very easy to attain with many different bullet weights.
I have run compressed loads in my service rifle with no problems but that issue seems to come with the 223 when running heavy bullets, especially mag length with Sierra 77's. Not a heavy compression but there is a bit of crunching when seating bullets. I don't have a problem with some load compression but going over 50 grs in the 6CM is not something I want to do.
In my Winchester case 51g of H-1000 comes up to the top of the shoulder not to the top of the case as seen in the pics.
I like this round.
Its easy to load for.
Brass is cheep.
@ 2.810 it fits in a STD ACIS mag.
You can run it from 3100 to 3287.
Its accurate
Its winning tactical matches.
I like this round.
Its easy to load for.
Brass is cheep.
@ 2.810 it fits in a STD ACIS mag.
You can run it from 3100 to 3287.
Its accurate
Its winning tactical matches.
rcw3
Site $$ Sponsor
teele1 said:
The problem is things don't always work out as they are represented to be. There's also a lot of "chest thumping" by some on these forums (i.e. 1/4 MOA at 3200 fps with the DTAC 115's all day long, etc.) but without good well thought out factual data backing it up.
Last night I decided to load up some H1000 chrono loads with the Berger 105 Hybrids for one of my 6CM barrels. I just got back from the range after chrono testing a 30" Krieger 4 groove barrel 1:7.5" twist with the 105 gr. Berger Hybrid bullets. Attached are the results - huge velocity differences from peoples' velocity postings on this thread - what the heck - so much for high velocities with H1000 (at least in that barrel). Gun shoots well, but it does the same or better with H4831SC without having to use a ton of powder to get any velocity out of it (factor the true costs into the equation and it may be cheaper to burn the barrel a little faster and save on powder costs).
The first 6CM barrel I had shot well with H1000 but the ES numbers for all loads were in the 75 fps range and could not get them down so that made things string vertical at longer ranges - so H4831SC became the back up powder (and it shoots very well in the 6CM's with low ES and SD numbers).
Don't get me wrong, the 6CM is an excellent cartridge, and I am not saying it's not, but it's certainly not somehow magically superior to others (including the plain old .243 Winchester).
Robert
With 4g more H-1000 you only got 62fps from Hogdons published data for a 105 bullet.
http://data.hodgdon.com/cartridge_load.asp
Cartridge: 243 Winchester
Load Type: Rifle
105 GR. HDY A-MAX Hodgdon Retumbo .243" 2.760" 46.0 2772 44,200 CUP 49.0C 2986 49,700 CUP
105 GR. HDY A-MAX Hodgdon H1000 .243" 2.760" 43.0 2798 45,400 CUP 46.0C 2930 50,200 CUP
105 GR. HDY A-MAX Hodgdon H4831 .243" 2.760" 38.0 2687 43,900 CUP 41.0 2846 50,200 CUP
105 GR. HDY A-MAX Hodgdon Hybrid 100V .243" 2.760" 37.0 2721 43,800 CUP 41.0C 2959 49,300 CUP
105 GR. HDY A-MAX Hodgdon H4350 .243" 2.760" 35.0 2663 44,300 CUP 37.5 2799 49,500 CUP
105 GR. HDY A-MAX Hodgdon H414 .243" 2.760" 36.0 2692 43,700 CUP 39.0 2862 50,100 CUP
105 GR. HDY A-MAX Hodgdon H380 .243" 2.760" 33.0 2589 43,700 CUP 35.0 2687 49,800 CUP
105 GR. HDY A-MAX Hodgdon Varget .243" 2.760" 31.0 2631 45,600 CUP 33.0 2769 50,800 CUP
105 GR. HDY A-MAX Hodgdon H4895 .243" 2.760" 30.5 2619 44,900 CUP 32.5 2724 50,100 CUP
50g of H-1000 puts me @3287fps
5.4mil to 1,000y
Just sayen
http://data.hodgdon.com/cartridge_load.asp
Cartridge: 243 Winchester
Load Type: Rifle
105 GR. HDY A-MAX Hodgdon Retumbo .243" 2.760" 46.0 2772 44,200 CUP 49.0C 2986 49,700 CUP
105 GR. HDY A-MAX Hodgdon H1000 .243" 2.760" 43.0 2798 45,400 CUP 46.0C 2930 50,200 CUP
105 GR. HDY A-MAX Hodgdon H4831 .243" 2.760" 38.0 2687 43,900 CUP 41.0 2846 50,200 CUP
105 GR. HDY A-MAX Hodgdon Hybrid 100V .243" 2.760" 37.0 2721 43,800 CUP 41.0C 2959 49,300 CUP
105 GR. HDY A-MAX Hodgdon H4350 .243" 2.760" 35.0 2663 44,300 CUP 37.5 2799 49,500 CUP
105 GR. HDY A-MAX Hodgdon H414 .243" 2.760" 36.0 2692 43,700 CUP 39.0 2862 50,100 CUP
105 GR. HDY A-MAX Hodgdon H380 .243" 2.760" 33.0 2589 43,700 CUP 35.0 2687 49,800 CUP
105 GR. HDY A-MAX Hodgdon Varget .243" 2.760" 31.0 2631 45,600 CUP 33.0 2769 50,800 CUP
105 GR. HDY A-MAX Hodgdon H4895 .243" 2.760" 30.5 2619 44,900 CUP 32.5 2724 50,100 CUP
50g of H-1000 puts me @3287fps
5.4mil to 1,000y
Just sayen
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