Author Topic: 257-300 ultramag (Read 1502 times)

northern hunter · « **on:** February 28, 2003, 03:03:17 PM »

Wow i came across this last night from rental rreamers a 257 on the 300 ultramag case talk about alot of powder in a tiny hole.But if the barrel would last 500 to 800 rounds it would be a lifetime of hunting after load development.
Anybody heard or used this round?
Would it be that much faster then a 257 stw?my quess is probabely not that much maybe 100fps maybe.
Any info would be appreciated.
Frank S. :-D

Robert · « **Reply #1 on:** February 28, 2003, 04:07:53 PM »

northern hunter · « **Reply #2 on:** February 28, 2003, 05:40:58 PM »

Always liked something diferent....
Had a ruger #1 7mm mag rechambered 8 years ago to the 404 jeffery necked down to 7mm and blowen out with a 25 degree shoulder and used it for 2 moose and 2 deer,then Remington came out with exactley the same thing 7mm ultramag big deal i had mine way before they even thought it up.
Wildcats are great.
Frank S.

reed257 · « **Reply #3 on:** March 01, 2003, 06:16:09 PM »

Had to go a little faster ?

jdt48653 · « **Reply #4 on:** March 29, 2003, 02:47:43 PM »

sounds like the 6.53 lazzeroni screamjet
85 gr at 4,000 per sec
100 gr at 3,700 per sec
120 gr at 3,550 per sec