Pleasant surprises with my old .270 winnie

Phil Rizzo said:

Definitely more to the Sherman designs than higher velocity.
The shorter and fatter cases SS and Max cases are easier to tune and keep there, and in his words "the efficient ones usually are."

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10-4.
I'll be reading a bunch more about it, trying to learn. That's part of the fun for me.

Right now I'm working on consistency in my ammo and practicing my shooting technique. It's been too long since I burned much powder and I'm rusty.

Funny how things come full circle. That old 270 has great ballistics!

Mr. Magoo said:

Yep. Before using the berger calculator I wouldn't have imagined stabilizing 170s in a 1:10 was possible even at my elevation.

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I checked and got a 1.7 which is "marginal" at my altitude of 2370'
Said it should shoot well but BC numbers might not match or some such.
Not sure what that means but I'll pick up a box of heavy bergers if I see them to play around with.

Hudge76 said:

I I've played around with heavy for caliber bullets in my .270 and .270 WSM. Once I hit 165 gr. on up, I get keyholes. Your elevation has a lot to do with it as well.

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Key holed because the twist rate doesn't support heavier bullets.
1-10 twist is the usual twist for a .270.
130-150 grain bullets are certainly in the Goldie Locks Zone.
I used 90, 100 110 grain Sierra bullets on smaller game like Coyotes and Antelope. The 100 & 110 were terrific on Antelope. They shot well enough but it was obvious that my Remington perfered the 140 gr Sierra SPBT to anything.
It was deadly on Elk and flew straight.

Capt Nag said:

Key holed because the twist rate doesn't support heavier bullets.
1-10 twist is the usual twist for a .270.
130-150 grain bullets are certainly in the Goldie Locks Zone.
I used 90, 100 110 grain Sierra bullets on smaller game like Coyotes and Antelope. The 100 & 110 were terrific on Antelope. They shot well enough but it was obvious that my Remington perfered the 140 gr Sierra SPBT to anything.
It was deadly on Elk and flew straight.

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The moral of this story is that it all depends on the elevation they're shot at. That has to be included in any conversation about twist and bullet weights. I thought that was super clear here but maybe not.

HI Mr. Magoo, I always wanted to say that!!!! I load for FOUR different 270 Wins. Three of them are mine. I am primarily a White Tail Deer Hunter. My favorite White Tail Deer Rifle is my Weatherby Ultralight , with a 24 inch Krieger Fluted stainless steel barrel. It really likes 59.5 grans H 4831SC with the 130 Grn. Nosler Ballistic tips. For me it's the perfect 300-yard Whitetail load. At 76 years old ,that's my personal limit for deer with this rifle, in this caliber with that bullet. 3020 to 3028 fps Muz. Velocity Lab Radar . My buddies Win Model 70 Featherweight, 22 inch Barrel, seem to get the best groups using IMR 4350. All Win Cases. All separated by weight, All Win LR Primers, all use 130 Ballistic Tips. Both are very good deer hunting loads. My load has given me several one-shot kills. Even had a couple of "Dead Right There" kills. Almost no tracking on most deer. Usual shots about 100 yards. However ,one deer was killed about 40 yards, Two deer killed about 70 yards, one deer killed at 260 yards. The bullet was completely blown apart in every one of these deer!!!! I'm too pleased with this load to ever change it. Best of Luck to you Buddy !!!

There is Jack O'Conner video on you tube, that has a lot of great info/history about the 270.