New .284

[svnmag]

IMO: Ammo companies are half a Democrat. They'd be better served by developing "new" loads for existing fodder and offering appropriate bbls for sale.

 

[Tikka280ai]

I get the idea behind this and the 277 fury. High pressure loads for 16-20 inch barrels than hang with if not beat "old" cartridges from 22-26 inch barrels. With how the popularity of supressors has taken off its a growing market.

My only hang up with these is being able to reload these specialty cases without needing a complete diffrent set of equipment

 

[svnmag]

I get the idea behind this and the 277 fury. High pressure loads for 16-20 inch barrels than hang with if not beat "old" cartridges from 22-26 inch barrels. With how the popularity of supressors has taken off its a growing market.

My only hang up with these is being able to reload these specialty cases without needing a complete diffrent set of equipment

Good post. Thanks. I'm an enthusiast and by no means an expert (obvious): Is this rd "saying" steel cases aren't shit anymore and SAAMI needs to "re-evaluate"?

FYI/FUN FACT: A bullet fired from a diving aircraft has enough inherit/relative velocity to overcome stability from twist:

 

[measure-it]

Can't wait for the new 7mmW.GAS. (7millimeter-who-gives-a-sh**)!

 

[PrairieGhost]

Yikes, 20 inch barrel, near 3000 fps with a 175g, and a muzzle brake. That muzzle blast should show up on the Richter scale. It would be a manufacturers dream to create a cartridge extremely difficult to reload. Also a dream for the gun control freaks.
A guy needs a walking gun and a sitting gun. If I had to pick one cartridge right now I would be happy with a 7 PRC in a 22 inch carbon barrel and another in a 28 to 30 inch heavy with 5R fast twist.

 

[Downrigger]

Yikes, 20 inch barrel, near 3000 fps with a 175g, and a muzzle brake. That muzzle blast should show up on the Richter scale. It would be a manufacturers dream to create a cartridge extremely difficult to reload. Also a dream for the gun control freaks.
A guy needs a walking gun and a sitting gun. If I had to pick one cartridge right now I would be happy with a 7 PRC in a 22 inch carbon barrel and another in a 28 to 30 inch heavy with 5R fast twist.

You shooting a 7PRC now? I’m looking at the new seekins trying to make a decision. I’m shooting a weatherby 30-378 with a break and it makes my head hurt from the sound.

 

[PrairieGhost]

You shooting a 7PRC now? I’m looking at the new seekins trying to make a decision. I’m shooting a weatherby 30-378 with a break and it makes my head hurt from the sound.

No I have never had a 7mm, but I may have to cure that. My grandson recently purchased a Seekins in 7 PRC. If all you hunt is deer, elk, moose, black bear, and no large bears I think that cartridge is about a perfect ballance. T h e faster twist in recent years makes every caliber take a step up in game use. Of course the 7mm in any cartridge has never been a slouch. Also for the past two years the Seekins has been my dream rifle. If you watch Backfire on utube he reports trouble with 7 PRC accuracy until he tried it in a Seekins.

 

[SDMF]

IMO: Ammo companies are half a Democrat. They'd be better served by developing "new" loads for existing fodder and offering appropriate bbls for sale.

Give or take, once you go over 55K PSI in any brass case, your primer pockets have a "lifespan".

You can keep the neck and shoulder "alive" almost indefinitely by proper sizing and timely annealing, but, get up into the low-mid 60K PSI range and primer pockets don't last forever. Some last longer than others, but, they all eventually fail to crush-fit a primer.

80K PSI is up in the range where in a brass case you pierce the primer, flame-cut nice little "pits" into your bolt face, and get a face-full of escaping gases. And/or the primer-pocket fails completely and when you open the bolt (if you can) the case comes out and the primer falls down into the magazine or trigger mechanism.

It's hard to say, but, it might make more sense to people if we got rid of "caliber headstamps" like 308Win and instead called out cases by their projectile diameter, case length, case capacity, and PSI ratings. If you've got a bore diameter, case capacity, and max PSI it becomes more difficult to be enamored with a "head stamp" as something magical.

The 308 x 51 x 56 x 62,000 doesn't exactly roll off the tongue like "308 Win" or "7.62 NATO" though.

It'll be interesting to see as more steel case offerings and reloading tools become available how the manufacturers go about dealing with the steel portion of the cases. Previous to the .277Fury or this new 7 BackCountry, the way to deal w/steel cases was to lacquer the cases and chrome line chambers and bores. Currently it looks like nickel-plating at least the steel portions of the case is how they get around "stickage". At bottleneck cartridge pressures, nickel eventually flakes off though. When that happens you run the risk of galling dies, or worse, chambers, bolt-lugs and/or bolt race-ways.

I'll admit, that a modest 22" bbl with what most consider a fairly "short" 6" suppressor, isn't nearly as "handy" as a straight 22" overall bbl length.

 

[luvcatchingbass]

I'm not sold on it yet, not saying I'm against it I'm just not sold on accuracy and real world consistent speeds.
Sounds like they have some kind of "special powder blend", watched a video where they tried pulling the bullet with pliers and twisted off the bullet in the case neck, jury is out on what "additional process" is needed for reloading, some data from Fedral says 3 or 4 reloads per case with maybe max of 6-8 before cases start cracking, depending who you watch I'm not impressed with initial accuracy or speeds, Seekins is saying they are redesigning their action to take the added pressure but you got guys out there saying that every major companies test their actions to higher than 65k pressure (which I'm sure they do), some are being responsible and warning against rebarreling older actions but you got some irresponsible saying you can take any of your old actions and rebarrel.
I don't see this reloader friendly right now. How much neck tension are they using? What is this special powder blend? What is this special case prep routine that's needed? How many suppressors can actually take consistent 80k pressure and at what barrel length will failures happen more likely?
I really do hope this pushes things to new limits vs the redesign/tweaking of old cartridge designs. There are just way too many questions out there that give me reservations.
Maybe I'm being closed minded because the way I hunt typically is get no advantage to a 16-18" barrel, heck most times I could have a 30" barrel and it wouldn't hinder me

 

[svnmag]

No I have never had a 7mm, but I may have to cure that. My grandson recently purchased a Seekins in 7 PRC. If all you hunt is deer, elk, moose, black bear, and no large bears I think that cartridge is about a perfect ballance. T h e faster twist in recent years makes every caliber take a step up in game use. Of course the 7mm in any cartridge has never been a slouch. Also for the past two years the Seekins has been my dream rifle. If you watch Backfire on utube he reports trouble with 7 PRC accuracy until he tried it in a Seekins.

"Liked" this vid as it validated my opinion of a "true" group from a COLD bbl. I've pissed off a few folks by waiting for the bbl to become ambient. The first "cold" shot is the "true" impact (all things considered) and "shouldn't" adversely affect a 10in circle or a "half dime" on turkey/small game/.

I'd rather blame myself than the gun/ammo. Rimfire can be a mindfuck IMHE.

That is all.

 

[SDMF]

"Liked" this vid as it validated my opinion of a "true" group from a COLD bbl. I've pissed off a few folks by waiting for the bbl to become ambient. The first "cold" shot is the "true" impact (all things considered) and "shouldn't" adversely affect a 10in circle or a "half dime" on turkey/small game/.

I'd rather blame myself than the gun/ammo. Rimfire can be a mindfuck IMHE.

That is all.

If your 1st “cold bore” shot is measurably outside your average group as thr bbl warms, IMO you’ve got a mechanical problem.

Scope bases
Scope rings
Bedding
Action screws

Or, less likely, you’ve got some stress in the bbl steel and you need a cryo treatment or a new tube.

Going back and forth between copper and cup and core projectiles doesn’t cause trouble in a good barrel either. Tuesday I shot a .270Win I bought used. It’s got a 6x42 Leupold in Talley lightweights. 130gn Hornady interlocks and 130gn TTSX with the same powder charge and same seating depth into the same group. Doesn’t matter if it’s cold or HOT just keeps pounding bullets into the group. As an aside, this is from the 2nd worst looking bore interior I’ve scoped.