25 Creedmoor

[okie man]

Call me old school! I've been around a little while at 51 years old. I don't even have a microwave! If you're gonna come out with something new you gotta dazzle me! If you're gonna make a cartridge it's gotta do 2 things. Equal something with less powder and action length and be readily available at a major retailer! I don't like searching or waiting for a specialty item. It has too be economical. Nobody in my social group is impressed by novelty items. If I said I have this new wizz bang whatever but you have too jump through hoops too get it they would say that's stupid! Tell them they can go get it at the local box store and it's the greatest new thing they would buy it! I haven't ever spent more than $1000 for a rifle and scope setup! I never felt like that was required to too be successful in the pursuit of the game I hunt in the places I hunt. New is good. But after a point it's just showing off! I'm more impressed buy a guy that takes a cheap gun and makes it shoot incredibly than a guy that takes a high dollar gun and makes it shoot no better than the cheap gun!

 

[MudRunner2005]

Hey, how about the .25 Grendel. Any 6mm Grendel Shooters in here? Oh Rats! Grendel Brass is Too expensive....

I actually have had one designed up for a few years, but had never had a reamer built. I think it would be an awesome cartridge for coyotes and deer.

 

[okie man]

It's called the 25 tcu! Been done ! Nothing new

 

[okie man]

223, 308, 30/06, 3 cases that have been necked up,necked down and blown out! Readily available, but really how many have become main stream or revolutionary? Again, dazzle me!

 

[okie man]

I would be interested in a 25 cal cartridge based on the Ruger compact magnum case that would push a 130 bullet at 257 weatherby velocities in a short action rifle but again I don't wanna jump through hoops too get it

 

[MudRunner2005]

It's called the 25 tcu! Been done ! Nothing new

.25 TCU is based off the .223 case. The 6.5 Grendel is based off the .220 Russian. Totally different.

 

[okie man]

John Saunders creates the best 25 cal short magnum based on the 7mm rsum case but it never became mainstream!

 

[MudRunner2005]

I would be interested in a 25 cal cartridge based on the Ruger compact magnum case that would push a 130 bullet at 257 weatherby velocities in a short action rifle but again I don't wanna jump through hoops too get it

Already been done... But on a better case than the RCM... It's called the .25 SST (Sherman Shortmag Tactical). There's a thread about it on here.

 

[okie man]

Except performance! I can pick up thousands of 223 cases at the range, but not many 220 Russians

 

[okie man]

He was about 15 years late on that one

 

[okie man]

Again, can't just go buy one of those

 

[MudRunner2005]

Except performance! I can pick up thousands of 223 cases at the range, but not many 220 Russians

They're nowhere near similar in performance. Yes, .223 brass is cheap and everywhere, but loading your own, the ends justify the means in the Grendel's favor.

 

[MudRunner2005]

Again, can't just go buy one of those

Actually you can. Straight from Rich's website. Reamers, dies, brass, the whole 9 yards.

 

[Heavyiron]

I won't pretend like I know everything about this. But one observation I have made is it seems like sometimes it takes a lot more powder in the big cases to get the same velocity of a smaller case.
For example if I use 54 grains of Rl-26 in my 6.5x284 Norma I get 2950 FPS. If I use 46.5 Rl-26 in a 6.5 creed I get 3075fps same bullet same primer. The Creed has 2 inches more barrel than the 284. I assume this all due to pressure but not sure I understand why so much more powder is needed. I would appreciate an explanation if someone is so inclined. By the way I am not being snarky I honestly can't understand why it requires so much more powder.

Bore capacity. Each caliber has its max. This is nothing new, but has been around as long as smokeless powder. When you reach bore capacity muzzle blast and recoil go up faster than velocity. Modern powders have cheated that somewhat with their slow burn rates. We all accepted the velocity that the factories put out about the 7mm rem mag, until chronographs came about then remington backed off on their claims. With older powders the 7mm rem mag and 264 win mag barely got above the 270 in velocity. Today with the new generation of powders we are able to achieve new peaks. Roughly 70 grains was max in the 30 bore for years, example, the 30/06 will achieve some where around 3000 fps with the 60 grains of powder. To get 300 to 500 more fps we have to add 1/3 more powder. Barrel erosion goes into play at that point. Even a 308 has better barrel life than a 30/06.
Interesting that today the 300 wsm, achieves the same velocity as the 300 win mag, it is achieved they say by a fatter case. It is closer to that magical 70 grains though.