.270, 90gr HP, 3700 fps ?

[SKULLANDCROSSBONES65]

G'day, I've just fired some reloaded .270win ammo through my Ruger M77 markII. I put all the shots over my chrony. I've never used a chronograph before and was surprised to find 2 shots got to 3700 fps. I was not expecting many to get much over 3600 fps. Temp 38 C /100 f. Altitude 300 m. Barrel hot (everything was hot). Federal primers. AR 2208 (VARGET) powder 53.5grains. Does this velocity sound right ?

 

[mkg]

S&C , All I can say is ... EEEOOOOWW ! that's hauling it.

I think it is in reality alittle on the fast side hodgdon lists a MAX load @ 55 gr Varget at a velocity of 3596 f/sec. That is for a 90 gr sierra HP out of a 24" 1:10 twist barrel.

How far away was the chrono graph from the muzzle ?

How hard is it to replace the barrel ? Because at that speed it's not going to last long.

Mike

 

[Loader9]

I was running the Sierra 90 hr HP out of my Remington at an average 3780'ps. It's bad medicine on coyotes. I shot that load for about 15 years and the rifle still shoots a 1" group at 300 yds. I was loading H414 FWIW. I doubt any damage to the barrel as 3700'ps is anything hot anymore. You can get a 22-250 past that with normal loads and my 6mm is pushing 60's right at it and no damage yet. The case capacity of the 270 isn't near that of a magnum case so powder erosion isn't going to be an issue. I say shoot 'em and be aware that it is NOT a load for hunting pelts. I've blown jack rabbits in several pieces at 200 yds with mine. Coyotes will have a small entry hole on one side and half of the other side is gone. It's close to being like shooting small hand grenades.

 

[mkg]

Loader9 we'll have to disagree on the barrel wear . The F-class guys running 6.5X.284 will toast a barrel in a season ( 1,500 to 2,000 rounds ) . Of course you'll not likely shoot that many rounds out of a hunting rifle in a year, If you are I want to know where you hunt
I guess PD towns would run you up close to that .
I shoot 22-250 right at 3620 , I could load up but why? I can tell you why not , barrel wear. I bi-sected a rabbit at 240 earier this year and ground hogs out to 518 that's enough range for me , well actually not but ....

Mike

 

[butta9999]

It states 55gr as a max load in Nick Harveys manual for 3600fps. So you are 1.5gr off max. Are you showing any signs of high pressures? What was the average verlocity?

I used to use 55gr bullets in my .243 and was punching over 4000fps, punishment on my barrel. I now use 70gr blitzkings for around 3600fps, a little tamer.

Might be a good idea to go for a heavier bullet save the barrel a little. The .270 aint really a varmint rifle. I have never really been a big fan of using the lightest bullet for the chosen caliber, unless of course its a varmint rifle. The BC and SD is greatly reduced.

If it is 3700 on your ruger its a HOT load mate