6SLR vs 6CM

[R.Morehouse]

Question...
I am about to chamber in either 6CM or 243AI, I would like to go with a shorter barrel so I could tote it around easier in my E.Stock GS2 and be just a bit lighter over all. My Kreiger HV will finish at 28. I was wondering generally how much speed you loose per inch down to say 22" in the mentioned chamberings? Thank's for your help.....Rick

 

[rcw3]

I am looking at the last post thinking - - Why would you go with an AI or an improved type case for a 6mm if you're just going to shoot a short barrel? Seems to me your just going to blow a lot of extra gas out of the muzzle without getting any more velocity out of it - - maybe I am missing something but I don't think so.

 

[R.Morehouse]

My barrel is a 6mm, my brass is 243Lapua. It was just a question based on 2 things 1) I am obviously new at this and 2) Those are the 2 reamers I have at my disposal that fits my barrel and brass. It was just a thought, like I said my barrel will finish at 28 if that would be the best for the chambering. A 6" shorter barrel isn't going to make or break my back carrying it around thats for sure. I thank your input....I learn something new every day about my new hobby.

 

[Dgd6mm]

Rick, I'm not sure how much speed would drop off in the 6CM going from 28" to 22". For certain types of shooting, I believe the 28" would be more beneficial then a 22" would be. I think, this is me personnaly, If it is for Tactical, F/Class/ Benchrest = 28". If for Hunting period, maybe 22", and you may have to shoot a faster burning powder then H-1000.

 

[R.Morehouse]

Yeah...I'm sure I will be sticking with the 28 so I can burn the slower ( more barrel friendly ) powders. Not a hunting rig. A few places around here where you have to do some hoofing to get to various spots to shoot. The E.Stock GS2 works great for that and can handle a longish gun just fine. But shorter ones better. Not willing to cut the nuts off either chambering.....Thank's for the input...Rick

 

[Ivo]

I just finished a load development session tonight shooting 107gr SMKs out of a 24" carbon fibre wrapped Benchmark barrel. I was getting 3140 fps with 43gr of RL17 with phenomenal accuracy so far and no pressure signs but I don't think I'm far off. Chambering is a 6slr btw. Hope that helps

 

[Nomad47]

Bump for Tarey (GNERGY).

 

[constructor]

I have been shooting the 6CM for several years.

For me, it works perfect. I use H1000, 115 DTACs, Lapua and Win brass.

I am using a mag fed rifle and the 30' shoulder still allows easy feeding.

One of these days I will have a AR-10 barrel chambered for it to stick in my OBR.

I would not recommend a 6CM or .243 Imp 30Ëš using H1000 in an AR-10 - - that powder has such a slow burn rate that your port pressure will be so high (even with an extended gas port) your gun will hammer itself very hard when cycling unless you have a puny little gas port - - and if you have a little gas port like that, then the rifle will be marginal for cycling properly with other powders like H4831SC or H4350 - - been there, done that. I have an AR-10 upper that I set up for use with H1000 and it won't even cycle properly with H4350 and with H4831SC it is marginal, yet it cycles pretty hard with H1000. For an AR-10, set it up to work with faster powders than H1000 and stay there - - besides, H1000 generates a huge muzzle blast and a lot more recoil because of the sheer extra volume of gas being expelled from the muzzle of the rifle - - just the wrong set up for the application IMO.

Robert

I think most that shoot gas guns in comps would port the barrel for the load they use not just drill a port and see how it works. Adjustable gas blocks and gas block sleeves are other options to adjust the carrier speed and I'm positive Hoser knows how to handle it.