Home Forums Hunting & Shooting Hunting Rifles Velocity Gain of 280 Reamed to AI in 22 Inch Pipe

RinB I totally understand going a hunting trip and need to find some ammo. I had a 7 RM and left my ammo at home, I was able to acquire a box at a small town. It was a box 175 gr ammo and my
rifle wasn't sighted in for that weight. Ever since then I make a list of what I want to take and check it off as I put it together.
Thanks for compliment on my choice of bullet weight for my 280.

Deans

Apologies for the hijack, but this article is so good...
https://www.gunsamerica.com/digest/ross-seyfried-busting-the-magnum-myth/

RinB

Speaking of the 270 Win, the 9 twist should work better for the mono's and 150 grain bullets but how does that twist do on 130 bonded or cup and cores? Seems to me that the majority of shooters are shooting heavy for caliber or long for caliber bullets and ditching the 10 twist for a 9 would really help the 'ole 270 and also be a selling point for gun makers. Your thoughts?

I don't get why people outside of short range BR are afraid of tighter twist. I've been shooting 100 grain bullets from an 8" twist 6.5 and they've done great.

If I had things to do over again I could easily get by with a: 22RF, 223, 270-280-30-06, and a 375. I like the 280 AI but realize even a 50 fps advantage over the standard is pushing it. But the reloading data foe the 280 is limiting and once you run it to higher pressures you might as well be in wildcat or other uncharted territory.

New barrel and dies go either way. Reaming out an existing barrel especially if it shoots well is usually not worth it. As has been pointed out before two more inches of barrel will make the velocity difference between the standard and AI almost nil. This is only for the more modern relatively straight tapered cases, some others will show a greater increase.

Next 270 barrel will be a 1 in 8.

M Man,
Completely off topic but I have many great memories involving lace panties. Nuff said.

Boog,
I agree about bullets with one caveat. The super high BC bullets are really great for ranges over 450 yards at least as far as hitting the target is concerned. My concern involves terminal performance. The bullets producing the best terminal performance while pretty good don’t hang with the super high BC in terms of wind drift,

I am primarily a hunter and enjoy getting close. My self imposed range limit is 440 yards. To me the real thrill is getting very close to something that is unaware of my presence. Mentally I am like a bow hunter but just don’t care much for those contraptions.

I'm sure you weren't the I one wearing them though.

Pretty much my conclusion of the diff between .338WM and .340 Wby.

Cheaper to feed the WM, easier to find ammo in some places, and the critters can't tell the difference.

Tejano - I think I understand what you were saying here, but I wanted to be sure.

I think you are saying that a 280AI at SAAMI max pressure of 65Kpsi is about 50fps faster than a 280 at 65Kpsi (5Kpsi over SAAMI max pressure). But then you are into wildcat/uncharted (guessing) territory.

I had a kimber Montana 280 ai and a rem 700 ks 280 at the same time. The rem mag box allowed me to load them out a little longer so they were pretty much equal speed wise. I now have a Christensen ridgeline in 280 ai. If I were building I'd do a standard 280 on a rem action with a 22" rem sporter barrel 8 twist. Might even do a remage.

Bb

This has been an intersting thread to follow. Not to derail the thread, but regarding magazine box length, any idea which factory rifle has the longest? Ruger? Remington? Winchester? Etc?

Rem 700

Thanks, MM.

Leftover angst fom when bullets weren't as well-balanced are they are now maybe.

More folks might try faster twists if the factories offered the option. Most are still cranking out the old standards, and aside from the loonys here and elsewhere, how many are going to invest time and money in a new barrel on their own? I have a 1-7" 6mm and a 1-8" 6.5, but they came that way.

Have to add to the kudos being piled on RinB for his perserverance and also his detailed story about his adventures. I've mostly stayed with a stock .270 since the '80s, and don't lean on it at all; 160s at about 2700 or 130s at 2900 work very well, on paper and Bambi. I'd like one of the 9" FCs, but mostly for the light weight, and with two regular ones, it remains a notion.