Case design as accuracy factor

[NZ_Fclass]

The majority of the reason the 284 win isn't popular within the hunting sector is because the factory ammo is nearly non-existent, and the stuff that does exist is not designed to reach it's full potential from a bolt gun, the 6.5-284 norma was designed with a stupidly short throat considering it's potential, and the brass for both is incredibly limited in comparison to other cartridges and often when it of stock.

It's not the cartridge itself that the hunting crowd follows .... It's the industry support for it.

Why is the creedmoor case and prc line so popular? Modern designs and incredible industry support because of Hornady ramming these things down every manufacturers throat.

We've lost out on incredible cartridges because of the lack of support and poor saami specs in comparison to what people want today. 7saum. 300saum. 300wsm (not as much support as it should have). 300rcm.

You make some good points - there are/were some good cartridges that never made the hit parade, often due to poor understanding from manufacturers - the 244 was a classic. Others - the 6.5mm Rem mag and it's non identical twin, the 350 Rem mag, both capable of long action performance in a short action - and well before the Winchester short mags. The Remington 7mmBR and the wildcat 6.5mm version, both good bush hunters and how about the 338 Federal? Bowls deer real well.

As for the Creedmoor, AKA 6.5/30TC..I have 3. 1 was accidental, 1 was a bargain buy and 1, well, I don't know, but we will see next F-Class season.

 

[Orr89rocz]

I guess the 284 being issued in the savage 99, winchester 88 and autoloader 100 were not popular. If it was in the bolt guns it might have been a success? Like the 6.5 and 350 rem mags, they were it an ugly bolt gun that i dont think sold very well or atleast didnt give the cartridge its due. A nice 700 would have been great in those cartridges

 

[SeabeeKen]

Just rebrand it “the 284 Creedmoore” and it would fly off the shelves.

Recall the 300 RCM? Big flop until they necked it down to 6.5, called it PRC and it was all the rage. Love my 338 RCM btw, .5" all day long

 

[davidjoe]

Short answer is they do and should look like the inside of the barrels they are shot from….

Powder column proportion usually bears a resemblance to the dimensions of the barrel interior, and then burn rate of the powder chosen is selected according to the weight of the bullet.

The closer a column gets to spherical the faster the powder burns (a volume of powder in a sphere burns the fastest of the shapes a “container” can take.)

The goal is to minimize expelling unburned powder, balancing a contour that maximizes accuracy, is limited by practicality, bullet heating, and decreasing rigidity.

We have seen from experiments that it takes a ridiculously long barreled inaccurate set up before MV actually decreases for rifle cartridges, MDT proved this connecting several .308 barrels.

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45 ACP 4.5 inch barrel

22 PPC 19 inch barrel

300 Win Mag 30+ inch barrel, for heavies.

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Where short and fat suffers is when we combine that shape with heavies and their necessary fast twist. The 7 Saum’s propensity to loosen its primer pockets is a good example how a column conducive to fast energy conversion takes a toll on the equipment.