7 SAUM Velocity Estimate

[dzelenka]

Anyone care to venture a guess on the velocity I can expect from 66.0 gr of Retumbo under a 168 VLD in a 26" 7 SAUM? Here is some more info to work with:
64.5 gr Retumbo with a 180 VLD runs 2869 fps and 65.7 gr of Retumbo with a 180 hybrid runs 2976 fps. Nosler brass and WLR primers for all loads.

I am thinking around 3050+/- 25 fps.

Dan

 

[Milo 2.0]

Unless all the data you posted is from the same gun, you'll never know. All guns, chambers react differently. Never guess charges and the like from someone else's gun.
Today, I'm going to pressure test my fourth saum, I've had one that run the hybrid at 3160, one 2900, the other 3025, this one is 27" long, I'm hoping!!

 

[dzelenka]

Unless all the data you posted is from the same gun, you'll never know. All guns, chambers react differently. Never guess charges and the like from someone else's gun.
Today, I'm going to pressure test my fourth saum, I've had one that run the hybrid at 3160, one 2900, the other 3025, this one is 27" long, I'm hoping!!

Same gun, cases, primers, powder lot. Only difference is the bullet weight and charge.

 

[dzelenka]

The answer is 3011 fps.

 

[trailrider121]

Nice. I'm pushing 162 amax with H4350 in Remington brass in 24" barrel @ 2995 avg.

 

[dzelenka]

The velocities that I have seen with the 7SAUM have been pretty impressive, especially for 60 - 65 Grs of powder.