300 ultra mag/ chrony

[Killmore]

Anybody chrony the remington FACTORY 300 ultra mag ammo loaded with the swift scirocco bullet? Preferably with the 26inch barrel..Trying to come up with a number so I can send my scope info to leupold.  oh,, 180 gr bullet with power level 3, Remington advertises 3250fps..  thanks..

[BULLBLASTER]

I have chronoed those shells from my sendero at 3210-3260. You should verify with your rifle though. Each is different. What is your rifle?
This shells wouldn't shoot worth a shiat in line... 2 inch at 100 yards. Also showed pressure signs in my rifle.

[JimmyHoffa]

When the factories use a chronograph, I believe they shoot at 70 F.  If it is hotter out, you will see higher numbers; and colder out, will see lower numbers.  If it gets too cold using slow powder in a large RUM case, might have to use even hotter primers to get ignition.

[ICEMAN]

This is the round I shoot and it does awesome. Never chronied it...

[jackelope]

If you're spending the money with Leupold to build a custom scope, don't guess on the numbers. Find someone with a chrono and ask them to borrow it or shoot through it.

[MtnMuley]

I have chronoed those shells from my sendero at 3210-3260. You should verify with your rifle though. Each is different. What is your rifle?
This shells wouldn't shoot worth a shiat in line... 2 inch at 100 yards. Also showed pressure signs in my rifle.

Me too, with nearly the same results as far as fps goes.  Every other shot was 50 fps different. Weird, but the mean was right around the middle so that was good.

[rbros]

If you're spending the money with Leupold to build a custom scope, don't guess on the numbers. Find someone with a chrono and ask them to borrow it or shoot through it.

Definitely don't guess.  Shoot it at distance as well and send that data to Leupold also. 

[BULLBLASTER]

A good online calculator is on biggameinfo.com play around with that before deciding on the atmospheric conditions to use for your turret. I have found this calculator very accurate.