Home Forums Hunting & Shooting Ask The Gunwriters 280 AI and 270 AI

338, I was with my little brother at the end of the rifle season. He loved the 375 and just wanted me to shoot something with it. I typically won’t shoot the little guys but we donated the little fella to an old hunter who wanted it. It was a win win. My brother got to see the 375 in action and a fella got to fill hill chest freezer.

I shot him with the 250 TTSX at 2950. I know there are a billion bullets for the 375 but in my mind there isn’t many that are going to do everything as well as that one does. Shoots real well at distance and it opened up fine on the buck and I’d think it might be okay if I were to hunt bigger things as well.

This has the 6.8 Western's throat and rifling twist, coupled to a std. .270 Win case.

Allowing to seat either longer/heavier bullets, or 150 gr. bullets further out w/ an ~ 4.6% powder capacity increase.






GR

That’s pretty cool Garandimal.

What are you building it upon?

Very interesting hybrid design.

I think I’d be inclined to “improving” to a 30 degree, .460” shoulder , just to differentiate from standard 270/130 loads
But, 3.6” Overall might be a giveaway

I agree with MD on this, it’s hard (if possible) to be better than the standard H&H. My pre-64 looks like somewhere between 95 to 98%. I bought it for $1,319 shipped If someone wouldn’t have ‘perfected’ the chamber the rifle would have easily sold for twice the money.
My pre-64’s at the time all had levers, so this was an easy decision for me. I wanted a 375 H&H and I wanted a pre-64. I had to be satisfied with the AI due to the thickness of my billfold issues. I’m loading some 375 H&H cases now seeing what accuracy I can get. It’s finally warming up,

Try 75 grains of IMR4350 with 300 Sierras.







260 PT here.




They chrono 2450. I could hunt happily with that combo, at least for goofing around.

Have a M700 BDL .270 I'm toyin' w/ re-Bbl'n.

Somethin' like this:



Sent the design to PacNor, but then got busy and put it on a back burner.

Figure it as an honest 600 yd.(1500 ft-lb) rifle w/ 150-165 gr. ABLR.




GR

GR - plenty of magazine space in the 700 for those .270 LAWGR 3.6” rounds.
Trouble with the Short Actions is it’s always about squeezing OAL into the magazine and shortening the case / neck to fit .

beretz,

The primary load I used for years in my first .375 H&H, a semi-customized Mark X Whitworth with a 22" barrel, were the 300-grain Partition and 80-81 grains of IM4350. In today's manuals this is a BIG overload, but back when I started using the rifle it wasn't. (Dunno whether this was due to varying throat lengths in .375's--which I found could definitely happen after fooling with several over the next three decades. But there it is.)

Anyway, it got right around 2550 fps from the "short" barrel, and not just with Partitions but other brands of 300s, including Sierra GameKings, and Swift A-Frames and their more recent Break-Away Solids. On the other hand, a Ruger No. 1 Tropical I also hunted with for several years, got about the same velocity with 75.0 H4350 and a similar variety of bullets.

None of those loads showed the slightest "pressure signs," even at 90+ degrees in Africa.

Yep.

Would really make the ole .270 Win a shiny new cartridge.

'Bout the only reason I'd fool w/ it at all.




GR

See it as a heavy-for-caliber/long range hunting rig.

The COAL/ M700 magazine/6.8 Western throat allow 150 gr bullets to be seated at 130 gr. depths, at the bottom of the neck.

Think about 140 gr. TSX at ~ 3100 fps, and 150-165 ABLR at ~ 3000 and 2900 fps respectively.


24" 40-X Rem Varmint contour Bbl.

Maybe a 9-1/2 lb. rifle.



GR

we have 270ai ,browning and winchester call it the 6,8 western

A decidedly well thought out heavy-for-caliber, long range .277 cartridge.

Starting from scratch, it would be very tempting.

... especially w/ a quality dialing scope.




GR