What does one offer over the other if both are 1-8 twist barrels? Barrel life? Accuracy? I have had several 243 rifles that were tackdrivers but I never uses especially heavy bullets. In my case I have plenty of 243 brass and no 6MM Creedmoor brass. I also already have several sets of 243 dies. So would the difference be enough to make it worth buying a couple hundred pieces of brass and a set of dies? And for the off the wall question does the 6MM Remington compare favorably to the 6MM Creedmoor? The bullet might have to be seated a bit deeper but the case capacity would still be more.
6MM Creed or 243
- Thread starter rickt300
- Start date
CJ6
Silver $$ Contributor
When loaded single the 6mm Rem will hand the 6 Creed a ticket to the little boys room.. BUT and this is the biggie getting good brass for the 6mm Rem is the sticker. Norma is the best out there (that I know of) unless you neck down 7x57 RWS brass. Why not go with the 243 AI or the 6 SLR ?
The 243AI will perform much better than either. If shooting the heavier bullets I'd prefer a 1 X 7.5 Twist. I shoot the 115 grainers with no issues in my 26 inch 1 X 7.5 Tw.
6-.284. Are you building a long or a short action? Do you want a single shot of mag fed? All are factors in your decision.
The action is a Remington 700 so a bit short. But I don't plan to use any bullet longer than the 105 gr. HPBT match bullet so mag length isn't a real issue. The longest range I can shoot at is 600 yards so some shorter bullets would probably be OK. I was just wondering if there is a real accuracy edge thay any one of these three might have over the other or if one gets markedly better barrel life.
The powder capacity between the two is fairly close. The Winchester having a little more capacity.
Enough to make a big difference in barrel life. Probably not.
As far as accuracy difference between cartridges.
There is none.
Any accuracy difference would be the rifle, barrel & shooter skill.
The differences are in case OAL, case-neck OAL, and shoulder angles, not performance, nor likely precision either. The shorter Creedmoor case is better suited to magazine use as @std7mag says allowing more of a long, heavy bullet to be outside of the neck. (........... and 105gn match bullets are long/heavy in this context.)
Whether either has an edge in barrel life depends on whether you subscribe to the 'Turbulence Point' (TP) hypothesis or not. The argument goes that a cartridge, especially over bore capacity designs like 243, produce a highly erosive ball of unburnt/burning powder kernels and very high pressure/temperature combustion gas in the case-neck/mouth area after the bullet starts to move. Case-design determines whether the TP remains inside the neck (good) or moves outside and sits in the chamber throat (bad for barrel life). How do you differentiate? Take an accurate case drawing and extend the shoulder lines forward until they intersect. That point is where the TP (allegedly) sits in use. The Creedmoor's TP is inside the case, 243's outside.
This issue is nothing new, and used to be a common discussion point in the days long before the Creedmoors when it was 6mm Rem v 243 Win, the former with a much longer case-neck. 6mm Rem fans claimed they got better barrel life despite its higher MAP and performance.
If there is an actual difference here (stressing IF), I doubt if it would be large enough in the Creedmoor's favour to justify the outlay on new tools etc. Depending on rifle purpose / use, I'd rate the COAL / bullet seating depth / magazine fit higher. Personally, I'm a fan of the 6mm SLR 243 based wildcat, in my view what a 21st century 243 Win should look like, but you don't want to go down that road if you want to keep things simple and stay with existing and/or off the shelf dies.
Whether either has an edge in barrel life depends on whether you subscribe to the 'Turbulence Point' (TP) hypothesis or not. The argument goes that a cartridge, especially over bore capacity designs like 243, produce a highly erosive ball of unburnt/burning powder kernels and very high pressure/temperature combustion gas in the case-neck/mouth area after the bullet starts to move. Case-design determines whether the TP remains inside the neck (good) or moves outside and sits in the chamber throat (bad for barrel life). How do you differentiate? Take an accurate case drawing and extend the shoulder lines forward until they intersect. That point is where the TP (allegedly) sits in use. The Creedmoor's TP is inside the case, 243's outside.
This issue is nothing new, and used to be a common discussion point in the days long before the Creedmoors when it was 6mm Rem v 243 Win, the former with a much longer case-neck. 6mm Rem fans claimed they got better barrel life despite its higher MAP and performance.
If there is an actual difference here (stressing IF), I doubt if it would be large enough in the Creedmoor's favour to justify the outlay on new tools etc. Depending on rifle purpose / use, I'd rate the COAL / bullet seating depth / magazine fit higher. Personally, I'm a fan of the 6mm SLR 243 based wildcat, in my view what a 21st century 243 Win should look like, but you don't want to go down that road if you want to keep things simple and stay with existing and/or off the shelf dies.
What's it for? I was looking at barrel blanks last night because I have 250 rds on my 260 LR rifle and about 800 on my 6xc. The wait is a long time from some of the barrel makers so i feel like i should order now to have one ready for when a barrel goes down. A 243 is not going to last long, do you plan to buy a couple barrels at a time? In the past I never felt like I needed to plan so far ahead. Things are so screwed up right now and I understand the desire to not have to source new components now. The guys trying to start out shooting matches with 284s are probably feeling the same thing as the people who bought into the 25 cal idea prior to covid. A 6mm is the way to go but you don't always need 3500fps imo.
rijndael
Silver $$ Contributor
How can a 6 Creed have a much better barre life over an XC? They're not that much different. They even share the same shoulder angle.
My shooting partner and I both run 115s, mine is an XC and his is a CM. We are within 25 fps of each other. I'd expect us to have a very similar barrel life. I think he runs 1/2 a grain more powder.
The 6 XC,.. HAS, the SLIGHTLY, better,.. Barrel Life.
Uses about, 2 or, 3 grains LESS Powder and HAS,.. a Longer Neck
Flame, "Turbulence Point" is further "back", in "throat area" on, the 6 XC.
Lots of, 2200- 2400 round Counts with, 6 XC's
OK maybe NOT "much" better but,.. SOME,. better !
Uses about, 2 or, 3 grains LESS Powder and HAS,.. a Longer Neck
Flame, "Turbulence Point" is further "back", in "throat area" on, the 6 XC.
Lots of, 2200- 2400 round Counts with, 6 XC's
OK maybe NOT "much" better but,.. SOME,. better !
Last edited:
Upgrades & Donations
This Forum's expenses are primarily paid by member contributions. You can upgrade your Forum membership in seconds. Gold and Silver members get unlimited FREE classifieds for one year. Gold members can upload custom avatars.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.
Click Upgrade Membership Button ABOVE to get Gold or Silver Status.
You can also donate any amount, large or small, with the button below. Include your Forum Name in the PayPal Notes field.
To DONATE by CHECK, or make a recurring donation, CLICK HERE to learn how.