.280 owners, can this velocity be correct????

[Mills]

I recently had a Remington .280 built that shoots quite well. I have it loaded with the max load in the Hornady manual: 154 grn Hornady Interbond with 58.5 grains of RL22 using CCIBR2 primers and Norma brass. I posted a 3 shot group earlier that measured .340 inches at 100 yards. Now the interesting part. The Hornady manual shows the velocity of this load around 2975. I just took my buddies chrony out to the range today and shot a few rounds. It was 69 degrees. The chrony consistenly clocked this load from 3280 to 3291 fps about 8 feet from the muzzle! Can this be correct? The rifle has a 24" Lilja #2 barrel. This seems incredibly fast. I barely got 3400 fps out of my old STW with a 140 bullet and that was shooting 74 grains of RL22. What kind of speed are you guys with .280s getting out of your rifles. I'm just wondering if there wasn't something wrong with my buddies chrony. And by the way, there are no signs of high pressure on the case webs, necks or primers.

[PJgunner]

I'm thinking you had the Chrony too close to the muzzle and the muzzle blast affected the reading. I always place my Chrony 15 feet dfrom the muzzle and even then somdetimes get a squirrely reading.
Paul B.

[Evan03]

id say you need another chrony to check against that one.

that is incredibly fast.

[Evan03]

what if you went 10yds off the muzzle 30 feet. this may drop your fps # a hair but i think would keep your readeing consistent.

the alliant website shows a 160gr bullet at 2795 with 55.7grs of rel22 through a 24" barrel

[Cossack]

While I find 280 velocity data typical low (the SAAMI standard is set at 55,000 PSI, some 5,000 PSI lower than comperable calibers like 270, because it was introduced in pump and auto rifles by Remington) yours does seem high... if the chron is working. Back the chron off as suggested. I feel more comfortable at not more than 2900 with 150's in mine.