Home Forums Hunting & Shooting Hunting Rifles learn me about the 280 AI

Not all rifles or barrels are equal, I shoot 3 groove PacNors and tend to get 50-75 fps more then book speed with 1-1.5 grs less and work up and stop at the first even indication of pressure as I'm not dumb.

To me a 280 A.I. is nothing more than a 280 with the advantage of vastly improved case life and reduced both thrust. The claim that A.I. cartridges mask pressure signs intrigues me not because I intend to run more pressure but because it tells me that the chamber design does not have week points in which the pressure is concentrated causing case distortion or failure at a sooner point in the life of the case. It's kind of like the difference between buying a vehicle that is a 50,000 mile throw away or a 300,000 mile marvel of good engineering. To me....engineering that increases the life of the machinery is a good thing. The engineering behind a straight wall case with sharper shoulders is in fact a very basic and simple engineering concept. In fact the principles involved are so simple you could call it stupid simple!

The claim that us A.I. owners are running excessive pressure is nothing more than a lying line of presumptuous BS. I guess we are supposed to buy and use pressure test equipment to load to pressure tested manuel loads for our 280 A.I.s even though 99% on this forum dont including Bobin Not Home! I'm getting tired of the lying presumptuous BS!!!!!Of course there are ones who will push the envelope from every caliber and make but this is not somehow mysteriously centralized to 280 AI owners. BOB....YUR FULL OF SCHIT!!"

Genius: I (use the term loosely)....along with straight tapers and sharp shoulders that don't stretch,we find finicky feeding in some rifles;high pressure that "seem" OK at home in (say) Illinois,could leave you stuck in the field with a jammed rifle when the temps hit 80 degrees in New Mexico or Africa.

The more tapered case extracts more easily due to the design of most bolt actions along the lines of the Mauser 98 types, primary extraction as you lift the bolt handle causing the case to pull away from the side walls of the chamber as the bolt handle is lifted...not so in a straight taper (Ackley design)as the case drags and sticks to the chamber wall,causing less reliable extraction and function.

The Brits and the inventors of the 7x57,the 30/06, the 270, and the 280,375H&H,300H&H all knew this stuff about bolt action rifle function, which you clearly "don't".

Of course you wouldn't know any of this because you don't know much except what you "read",are an idiot,and have little to no hunting and shooting experience.A treatise of what you"know" will fit on the back of a postage stamp,single spaced.

I'm still waiting to hear all your 7mm "experience" of which I suspect there is very little.

Go sit in a corner,junior.You know next to nothing...you're just polluting the bandwidth.

Just curious how you know your barrel is 50-75 fps faster without knowing the pressures your running?
and you say your load work up is stopped when the first sign of pressure is seen, yet everyone you show your brass to says your brass looks fine even without checking the primer pockets or taking case head measurments or looking for case head thinning, is it possible even those you showed your cases to don't know for sure the exact pressures your running?

Bob,

Not at all attempting to misquote you and of you read it that wayy apologies. I am just trying to honestly understand where you feel people like me have pushed too far.

As i read it, the poster of the article said R22 would give more velocity before pressures climbed then 4350 or 4831. That is in line with what the books say, what I have read and my experiences.

You say I'm well over the top yet my loads are at or under book max in several books and within 50-65 fps of book speeds. Is up to 65fps really that big of an indicator of a problem or not in the realm of being an acceptable variance in different barrels?

I don't ever try to push past what I read is a safe load and have worked up to. I am trying to understand how i am "well over" when my loads are like I said within what i consider an acceptable speed variance of book loads and countless loads posted online going back years.

No I will not push it past 3315 and may even take a bit of powder out of it if there is some compelling reason too but I haven't seen one yet except claims only that my velocity is too high.

Ackleyfan,

No I do not have my own pressure measuring device but do know for a fact that I get none of the well established pressure signs I.E. hard bolt lift, flat primers, extractor marks etc. After 7 loadings my primer pockets are still nice and tight, case head measurements show no sign of stretching and the 3 pieces of brass I have cut apart show no thinning anywhere.

So yes your correct in that no one can tell me for sure what the pressure is in my rifle. All I can go on is I'm following book load that I worked up to and everything that I can check in regards to pressure signs seems normal to me.

Guys, I'm not too hard headed as to think I know it all, nor too old to learn if someone has advice or an explanation. I just have a hard time wrapping my mind around claims that I've pushed it too far based simply on velocity yet nothing I can see says so.

As I said everything I have read tells me I'm near the top end but can find nothing that tells me I'm over.

Also is it possible that my barrel being a 3 groove has anything to do with my speeds being higher? Do they possibly create less pressure? I have 3 other 3 grooves in the safe and all of them reach book speeds typically at 1-1.5 grs under max and again with no pressure signs that I can see.

Like I said guys I'm all ears but I need a bit more then just my speed means my load is unsafe.

Chill out Bob you'll be stroking out pretty soon!

JHC, WTF happened to you?

AF: Exactly....glad someone on here has the brains to "get it"!

Still have not seen anyone tell me how a case with 67 gr of powder capacity jumps 200-300 fps over a standard 280....Voodoo? Black magic?

338RCM I have ZERO experience with the 280AI...having owned and loaded for 7-8 280's and at least double that many 7 Rem mags,what, EXACTLY,is a 280AI gonna show me?

Nothing.

56.0 grains of imr 4350, and a 140 ttsx was all it took to whack this oryx at 693 yards.
No super velocity, no trimming, just a light recoiling, super accurate rifle with years of brass life.

56.0 grains of imr 4350, and a 140 ttsx was all it took to whack this oryx at 693 yards.
No super velocity, no trimming, just a light recoiling, super accurate rifle with years of brass life.