6mm creedmoor

Yea..I think it's the newest fad, so everything is jumping to it...just like they did 6mm creedmoor 6 competition 6 dasher 6 brx. They all shoot great, comes down to the shooter. Personally I like the dasher and brx.
 
I been wondering why not just get a 243win? I was wanting a 6cm but I think I will get a 243 win. I just don't see much advantage.
 
Mightyox04 said:
I been wondering why not just get a 243win? I was wanting a 6cm but I think I will get a 243 win. I just don't see much advantage.
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I was thinking the same thing but no one makes a 1:7 or 1:8 twist in the .243. If one of the major gun makers would make one and advertise it properly it would probably sell. The .243 has been around a long time and has an avid following. With a little tweaking (call it the .243 LR or something) it could really spice things up. So, I'll probably get a 6mm so that I can shoot those longer 105 -107 grain bullets.
 
Downeast said:
I was thinking the same thing but no one makes a 1:7 or 1:8 twist in the .243. If one of the major gun makers would make one and advertise it properly it would probably sell. The .243 has been around a long time and has an avid following. With a little tweaking (call it the .243 LR or something) it could really spice things up. So, I'll probably get a 6mm so that I can shoot those longer 105 -107 grain bullets.
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Ive seen plenty of 1:7 & 1:8 twist 243 barrels.

Criterion makes one. 243 is a good round but it wont do anything better or worse than the 6mmCM. If I didnt have brass already, id probably do a 243AI or a 6br... but no need to buy extra brass for a caliber with a very similar barrel life. 243 usually burns out before 2000 rounds, if you're running bigger bullets, which you would for comp. shooting.
 
Yes, there are lots of barrels out there for folks looking to build a rifle. What I'm saying is with all of the interest in the CM's and long-for-caliber bullets why doesn't someone (like Savage or Ruger, for example) put out a .243 with a tighter twist that I can just go and purchase at Wally World? Ruger offered a .243 in the original RPR with a 1:8 (?) but they dropped it in favor of the 6 CM.
 
Downeast said:
Yes, there are lots of barrels out there for folks looking to build a rifle. What I'm saying is with all of the interest in the CM's and long-for-caliber bullets why doesn't someone (like Savage or Ruger, for example) put out a .243 with a tighter twist that I can just go and purchase at Wally World? Ruger offered a .243 in the original RPR with a 1:8 (?) but they dropped it in favor of the 6 CM.
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Oh, I gotcha, you meant from a manufacture, on a rifle! Misunderstanding.
 
So, while I wait for my barrel to arrive, ive been reading up on 6CM. Ive seen a lot of people saying that your speeds will increase over the first 100-150 rounds with a new barrel. Any truth in that, or is it shooter myth, like a barrel break in?

I dont see a point in working up a load if after 100 or so down the pipe, my speeds will increase and possibly make me need to tweek the load again.. but the cheapest factory ammo ive found is hornady black at Outdoor for $0.90 a round and I dont want to blow through $100 in factory either.
 
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jmccracken1214 said:
So, while I wait for my barrel to arrive, ive been reading up on 6CM. Ive seen a lot of people saying that your speeds will increase over the first 100-150 rounds with a new barrel. Any truth in that, or is it shooter myth, like a barrel break in?

I dont see a point in working up a load if after 100 or so down the pipe, my speeds will increase and possibly make me need to tweek the load again.. but the cheapest factory ammo ive found is hornady black at Outdoor for $0.90 a round and I dont want to blow through $100 in factory either.
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Nothing wrong with a 6 creed. My wife's 6 creed has 1700 rounds down the tube and still shoots 1/2 moa or better. After barrel break in the barrel did speed up a little. Only having to take. 1 to maybe .2 tenths out of the dope depending on how far the targets are. Her sponsor is building her a new rifle in 6 creed and her old one will be there as a back up in case anything goes down. Obviously if you hot rod the load barrel life will go down. Her 108 hornadys fly 2960 fps which is plenty.

Another friend shoots the 6 creed and uses 105 hybrids at over 3150 fps. It was a hot rod load. After the barrell went bye bye he built another 6 creed and now he turned down the speed to 3000 fps and is shooting better than he ever has.
 
Downeast said:
Yes, there are lots of barrels out there for folks looking to build a rifle. What I'm saying is with all of the interest in the CM's and long-for-caliber bullets why doesn't someone (like Savage or Ruger, for example) put out a .243 with a tighter twist that I can just go and purchase at Wally World? Ruger offered a .243 in the original RPR with a 1:8 (?) but they dropped it in favor of the 6 CM.
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I believe the limiting factor with improving the .243 Win is the inability to seat the longer 100gr+ bullets far enough out of the case based on SAAMI specs?

I recall Ga Precision tweaked the .243 Win chamber dimensions over a decade ago (circa 2005) to shoot 115gr DTAC's at over 3k fps. Barrel life was a bit short to say the least. :)
 
I'm still working up a load for my 6 CM. Anyone wish to share some info before I spend a bunch of money on powders that may not work? :rolleyes: I've got 500 107 Sierra's.
 
Do you have a good quality chronograph? Have a load together in 30-50 rounds after your barrel stops speedig up. H4350 is go to powder.
 
I did a ladder test this morning using 35 to 41 grains of H4350 and my best 5 shot group was with 37 grains and measured .0.23" at a hundred yards. SD = 3.0

Sierra 107 grain MK seated at 2.80 (book). Velocity was a bit slow, averaging 2689 fps.

At 41 grains the group had opened up to 1.23" with a SD of 13.4

Shooting a Howa with a 26 inch barrel, round count as of today is 150.

I'm going to duplicate the 37 grain load and see what happens and if it holds together I'll play around with seating depth. This is a lot better than with R15, that's for sure.
 
Downeast said:
I did a ladder test this morning using 35 to 41 grains of H4350 and my best 5 shot group was with 37 grains and measured .0.23" at a hundred yards. SD = 3.0

Sierra 107 grain MK seated at 2.80 (book). Velocity was a bit slow, averaging 2689 fps.

At 41 grains the group had opened up to 1.23" with a SD of 13.4

Shooting a Howa with a 26 inch barrel, round count as of today is 150.

I'm going to duplicate the 37 grain load and see what happens and if it holds together I'll play around with seating depth. This is a lot better than with R15, that's for sure.
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I would 100% push that faster. I’d start 41.4 and work my way up until I started seeing pressure. I was at 43gr before primers started to crater slightly.

No point in a 6mm if you’re running it that slow
 
My only concern is that if my groups open up there is no point in shooting it either. :( The redneck heathens I shoot with are all about groups. Sure, they shoot steel for fun but when it comes down to serious business it's who can keep it together on paper. You shoot more than one 1 MOA and they tell you to go home and take your diapers with you. :p :D

If you can keep 10 shots in a 3 inch circle at 300 you are doing good. Ten shots in the x ring (1.5 inches) and you can run with the best of them around here. Every one of the RPR's I've seen are shooters with the appropriate handloads.:D

I agree that I would like to see the speed up around 3K or so. I'll keep playing around with it. What was your velocity at 41.6?
 
Downeast said:
My only concern is that if my groups open up there is no point in shooting it either. :( The redneck heathens I shoot with are all about groups. Sure, they shoot steel for fun but when it comes down to serious business it's who can keep it together on paper. You shoot more than one 1 MOA and they tell you to go home and take your diapers with you. :p :D

If you can keep 10 shots in a 3 inch circle at 300 you are doing good. Ten shots in the x ring (1.5 inches) and you can run with the best of them around here. Every one of the RPR's I've seen are shooters with the appropriate handloads.:D

I agree that I would like to see the speed up around 3K or so. I'll keep playing around with it. What was your velocity at 41.6?
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3000-3025fps out of a 24"

Youll find an accuracy node with faster speeds. May need to change bullets, but if you're set on SMK, load from 41.2/41.4 up and keep check on your primers after shooting for pressure.
 
I shot 41 this evening and got right at 3K. Group was a little screwy but not bad. I'll keep on it and see if I can find a node.

I was shooting Berger's and I do like them but they always seemed to be back-ordered and I just got tired of it. So I switched to Sierra and never looked back. Off the top of my head I believe that the Sierra data lists 107 MK's as topping off above 42 grains.

Thanks for the info.
 
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I found the best load (.302" at 100) with a COAL of 2.883. Magazine length is 2.82. So, I'm back to a single shot rifle. :rolleyes::p:D
 
My load for my 6 creed out of my 24 inch prs rig is 41.2 grains of reloder 17. Pushing a 105 hybrid at 3120. 2.248 to the ogive which fits in the mag. I dont want to use up my 4350 on that gun since it's a back up. But shoots really well. Shoots a ragged hole.
 
Downeast said:
I shot 41 this evening and got right at 3K. Group was a little screwy but not bad. I'll keep on it and see if I can find a node.

I was shooting Berger's and I do like them but they always seemed to be back-ordered and I just got tired of it. So I switched to Sierra and never looked back. Off the top of my head I believe that the Sierra data lists 107 MK's as topping off above 42 grains.

Thanks for the info.
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https://www.midwayusa.com/product/1018227839/hornady-eld-match-bullets-polymer-tip-boat-tail

ELD’s are on sale
 
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