Daily Bulletin - 6mm Creedmoor

[K22]

Just curious - the Bulletin claims that a lot of competitors are moving to the 6 mm Creedmoor.

Is there that significant difference between a 243 Win and a 6mm Creedmoor?

The 243 always got a bad rap on barrel life. Is the 6mm Creedmoor any better?

In other words, what does a 6mm Creedmoor do that a 243 Win can't do?

 

[tomswede]

Just curious - the Bulletin claims that a lot of competitors are moving to the 6 mm Creedmore.

Is there that significant difference between a 243 Win and a 6mm Creedmore?

The 243 always got a bad rap on barrel life. Is the 6mm Creedmore any better?

In other words, what does a 6mm Creedmore do that a 243 Win can't do?

Or what a 6XC can do an even closer match.

 

[shoot4fun]

It seems that in PRS there is no shortage of fine 6MM cartridges to go around. Choose the 6 Creedmoor, 243 Win, 6XC, 6BR, 6 Dasher and now even the 6BRA. One thing is for sure these shooters are launching a bunch of 6MM bullets. Need I say even the 6.5x47 and the 6.5 Creedmoor are losing ground to the "fantastic sixes".

 

[Park ranger]

Because they need flat Shooting, right. Fixed ranges where wind drift matters is a different game

 

[shoot4fun]

Because they need flat Shooting, right. Fixed ranges where wind drift matters is a different game

While "flat shooting" is desirable due to the stages being multiple target and varying distance it is not the only reason so many PRS shooters are shooting the 6's. The lower recoil generated allows competitors more ability to spot their own hits/misses.

 

[C.E.Smith043]

Not to add a fuel to the fire but ive talked to many prs shooters that claim the 6mm carts are more difficult to tune compared to 6.5 carts. Anyone else notice this.

One friend of mine claimed he basically had to retune the load after every match with the 6x47, but he could shoot several matches with the 6.5x47 before he needed to retune the load.

 

[shoot4fun]

Not to add a fuel to the fire but ive talked to many prs shooters that claim the 6mm carts are more difficult to tune compared to 6.5 carts. Anyone else notice this.

One friend of mine claimed he basically had to retune the load after every match with the 6x47, but he could shoot several matches with the 6.5x47 before he needed to retune the load.

The 6x47 is based on the 6.5x47 brass but any similarity ends there. The 6MM version is an animal all in itself and acts like no other 6MM. It is, by many accounts from those who have tried it, very temperamental.

 

[C.E.Smith043]

The 6x47 is based on the 6.5x47 brass but any similarity ends there. The 6MM version is an animal all in itself and acts like no other 6MM. It is, by many accounts from those who have tried it, very temperamental.

That's what I've heard

 

[22DASHER]

Shot my 6x47L at a two day PRS match a couple weeks ago. Absolutely no issues on it going out of tune. Shot five rounds once I arrived to check zero at 100 and put them into a 1/4" group. From there I proceeded to fire over 200 rounds in two days, multiple 12-15 round count stages....Also never had an issue. I brought the rifle home and wanted to verify that I didn't "leave any thing on the table" since I hadn't cleaned the rifle. Another five shots at 100 proved I was still right where I needed to be. Only special thing to note is that I do shoot Moly so I can get away with longer strings in between cleanings. Needless to say it cleaned up with no more effort then with 30 rounds on barrel. Only one thing whopped my butt at the match - the WIND! I have now had several 6x47's and have yet to experience a fussy one

 

[SteveOak]

The 243 was conceived before the 'modern age' of 30 to 40 degree shoulders and reduced taper bodies. The XC, Creedmore and so on have these better case dimensions.

There is a school of thought that cases with these sharper dimensions burn more of the powder in the case and less in the throat resulting in less barrel wear.

I have seen it discussed that the angle of the shoulder propels either less of the heat/explosion out of the case, thereby resulting in less throat erosion.

The modern cases seem to be more efficient, e. g. achieving the same velocity with less powder. That certainly will result in less throat erosion.

The downside is that they are fun as hell to shoot so all of those things that might reduce throat erosion go out the window.

 

[270WinDude]

The 243 was conceived before the 'modern age' of 30 to 40 degree shoulders and reduced taper bodies. The XC, Creedmore and so on have these better case dimensions.

There is a school of thought that cases with these sharper dimensions burn more of the powder in the case and less in the throat resulting in less barrel wear.

I have seen it discussed that the angle of the shoulder propels either less of the heat/explosion out of the case, thereby resulting in less throat erosion.

The modern cases seem to be more efficient, e. g. achieving the same velocity with less powder. That certainly will result in less throat erosion.

The downside is that they are fun as hell to shoot so all of those things that might reduce throat erosion go out the window.

I agree with this. However one more variable to add would be twist rate. Your points are correct in my mind for the cartridge itself and also stated on this pretty good article: https://www.outdoorlife.com/6mm-creedmoor-next-thing-in-long-range-shooting#page-4

But barrel life also is dependent on twist rate, powders used, type of charge, how you use it, etc which depends on the gun and person. It just depends. I could probably get more rounds out a hot 6mm cm then some of the shooters on here would a decently loaded 243win and visa versa IMO. Also I think the 6cm and the 243 are similar case capacity. I've been trying to figure out any "inherent" differences regarding accuracy and it seems inconclusive as reports are still showing 243s winning some matches and shooting good scores. Between the 2, general consensus upon quick examination would lead one to believe the creedmoor would be more inherently accurate but I don't know.

 

[bart brennan]

The 6x47 is based on the 6.5x47 brass but any similarity ends there. The 6MM version is an animal all in itself and acts like no other 6MM. It is, by many accounts from those who have tried it, very temperamental.

Shoot4, I’ve always wondered if the necking down of this sturdy brass without neck turning and then mandreling is causing some of the finicky results? I think that fella alf has an unturned 6x47 and he doesn’t seem to have problems.

 

[C.E.Smith043]

Shot my 6x47L at a two day PRS match a couple weeks ago. Absolutely no issues on it going out of tune. Shot five rounds once I arrived to check zero at 100 and put them into a 1/4" group. From there I proceeded to fire over 200 rounds in two days, multiple 12-15 round count stages....Also never had an issue. I brought the rifle home and wanted to verify that I didn't "leave any thing on the table" since I hadn't cleaned the rifle. Another five shots at 100 proved I was still right where I needed to be. Only special thing to note is that I do shoot Moly so I can get away with longer strings in between cleanings. Needless to say it cleaned up with no more effort then with 30 rounds on barrel. Only one thing whopped my butt at the match - the WIND! I have now had several 6x47's and have yet to experience a fussy one

Not questioning your experience, but for me a 100 yard group is not sufficient to judge if a load is out of tune for a prs rifle, that will need to shoot way beyond 100 yards.

 

[22DASHER]

Not questioning your experience, but for me a 100 yard group is not sufficient to judge if a load is out of tune for a prs rifle, that will need to shoot way beyond 100 yards.

Don’t worry it was shot out to 1,200.

 

[shoot4fun]

Shoot4, I’ve always wondered if the necking down of this sturdy brass without neck turning and then mandreling is causing some of the finicky results? I think that fella alf has an unturned 6x47 and he doesn’t seem to have problems.

As for the 6x47 I never owned one or shot one but several of my long range shooting BR buddies have said the 6x47L was hard to get to shoot well. IIRC, they said it shoots best when the flash holes were opened up a little.

 

[bart brennan]

I

As for the 6x47 I never owned one or shot one but several of my long range shooting BR buddies have said the 6x47L was hard to get to shoot well. IIRC, they said it shoots best when the flash holes were opened up a little.

see alpha is making 6xc and 6 creed. I have been thinking 6 creed may be my next barrel after burning the 6x47 if it turns out to be finicky.