22" barrel 270 Win and 140 AB's 3000+fps?

[vodekzz]

In my case 140 AB went at 2950FPS with H1000. This is as fast I could go safely.
130 AB I could shot 3050 FPS. With 150 gr VLD I can get 2875 FPS accurate.
Rifle Sako 85, 22 inch tube. I would pick great accuracy over velocity. If you can get 24 inch barrel I would say you should gain another 40 to 50 FPS.
3000 FPS it is a magic number for my 7mm RM today.

Vodek

 

[bobnob]

I got 2950fps with the 140 AB and 59g of H4831SC in a 24" bbl. I did push it to about 3050fps but I had to use H4350 and saw no advantage really, so settled for 2950fps which was accurate and killed pigs very well indeed.

 

[brians356]

Sorry, I did not get a chance to clock my hot 140 BT loads in the 22-inch Ruger. (My shooting buddy actually owns the chrono, I own the portable shooting bench. Rather like Jack Sprat and spouse we are.)

It occurs to me Hodgdon Superformance could be the ticket here, but it is not flexible, and Hodgdon don't publish data for 270 Win. You could call them about that, but my hunch is they will advise against even trying it. (In loads they do publish for, always for lighter bullets, it beats any other powder by 100-200 fps.)

It looks like H-1000, compressed, yields the highest velocity of all powders Hodgdon publish for the 140-grain bullet, from a 24-inch barrel at 2979 fps and 50,800 CUP.

 

[rmarshall]

I look forward to hearing your results, I agree that the difference between 2900 and 3000 not alot of difference, dead is dead. Whether at 2900 or 3000.

 

[bobnob]

It looks like H-1000, compressed, yields the highest velocity of all powders Hodgdon publish for the 140-grain bullet, from a 24-inch barrel at 2979 fps and 50,800 CUP.

I wouldn't count on it. That's a very slow powder and I reckon you'll run out of space before you hit the speeds you want.

H4350 will do it imo.

 

[brians356]

It looks like H-1000, compressed, yields the highest velocity of all powders Hodgdon publish for the 140-grain bullet, from a 24-inch barrel at 2979 fps and 50,800 CUP.

I wouldn't count on it. That's a very slow powder and I reckon you'll run out of space before you hit the speeds you want.

H4350 will do it imo.

Only reporting Hodgdon's data, no editorial content added. From the same 24-inch barrel, H-4350 only delivered 2870 fps @50,400 CUP. That's over 100 fps slower than H-1000. Step down to a 22-inch barrel, would H-4350 overtake H-1000? Possible, I suppose ...

 

[brians356]

Sorry, won't be able to clock my old 140-BT load until after 12 July at the earliest.

 

[rmarshall]

keep me posted Brian, thanks

 

[bobnob]

It looks like H-1000, compressed, yields the highest velocity of all powders Hodgdon publish for the 140-grain bullet, from a 24-inch barrel at 2979 fps and 50,800 CUP.

I wouldn't count on it. That's a very slow powder and I reckon you'll run out of space before you hit the speeds you want.

H4350 will do it imo.

Only reporting Hodgdon's data, no editorial content added. From the same 24-inch barrel, H-4350 only delivered 2870 fps @50,400 CUP. That's over 100 fps slower than H-1000. Step down to a 22-inch barrel, would H-4350 overtake H-1000? Possible, I suppose ...

I meant no sleight of course. Its just that I find even H4831 ( which is called Ar2213 SC here ) borderline slow even for 140g bullets in the 270 Win.

Some of that could be my barrel/chamber of course. I have found H1000 however to be very very slow and hard to get speed out of in this case.

 

[brians356]

keep me posted Brian, thanks

Well, I followed through, and it was sobering. Recall these are RE-22 loads - 58.4 grains - a full 2.0 grains beyond Sierra's max RE-22 load for a 140-grain bullet. The load from my 22-inch Ruger 77R clocked 3150 fps.

Sobering because the first round took considerable effort to lift the bolt, and the second experienced considerable primer setback - in that the primer fell out of the case after extraction! My Samoan attorney in the red convertible advised me to dismantle the few remaining rounds, then drink heavily.

I feel questing after 3100 fps from a 22-inch barrel is a mug's game. I loaded these rounds at least 15 years ago, when I was younger and still laboring, apparently, under a delusion of immortality.

Brian

 

[gerry]

keep me posted Brian, thanks

Well, I followed through, and it was sobering. Recall these are RE-22 loads - 58.4 grains - a full 2.0 grains beyond Sierra's max RE-22 load for a 140-grain bullet. The load from my 22-inch Ruger 77R clocked 3150 fps.

Sobering because the first round took considerable effort to lift the bolt, and the second experienced considerable primer setback - in that the primer fell out of the case after extraction! My Samoan attorney in the red convertible advised me to dismantle the few remaining rounds, then drink heavily.

I feel questing after 3100 fps from a 22-inch barrel is a mug's game. I loaded these rounds at least 15 years ago, when I was younger and still laboring, apparently, under a delusion of immortality.

Brian

Great line about the Samoan attorney

Glad you didn't have a bigger boom, I think we have all pushed the limits at one time or another. Having an incident like this can definitely help a guy be safer in the future and not push things too much.

 

[brians356]

Great line about the Samoan attorney

That red convertible was a Bonneville as I recall.

I should point out that these loads were assembled many, many years ago, so It's possible the powder in them is not behaving exactly as when they were fresh. I don't know if it's possible for aged reloads to become "hotter" over time. But I knew they were stiff loads back then, I just never had these extreme pressure signs.

Also, the ambient temperature when I fired them yesterday was close to 90f, and I don't recall that I ever tested any when it wasn't cold. And I don't know how temperature sensitive RL-22 might be.

 

[ColColt]

I've never used anything but H4831 or IMR4350 with any bullet weight. With 58 gr of H4831 and the 140 gr AB I get good accuracy but I don't know the velocity.