300 RUM 220, 240 gr SMK velocities.

W

*WyoWhisper*

Guest
As some of you know I am in the process of building a new toy ( woo hoo )thru the grace of the computer GODs I have lost some info.

I need the best SWAG ( scientific wild *** guess )from someone in the relms of what type of velocities I can expect from..

300 RUM with 28" barrel with 220 and 240 gr SMK's safely. Just close not holding anyone to their word. I am researching possibilities on the ballistics programs and this was my starting point.

as always thanks in advance.....
 

Darryl Cassel

Well-Known Member
Joined
May 7, 2001
Messages
1,757
Location
Pennsylvania
Hello Ric

You know the 34" outfit I'm working with so my velocities would be quite a bit more then the 28" will give you.

Try 3100 to 3150 fps with the 220 and 3000 FPS for the 240gr.

I was able to get 3168 Fps out of the 240 gr in the 34" barrel so far.

Hope that's close for you.

DC
 
W

*WyoWhisper*

Guest
Thanks DC,

I hit the road today to start the sport and travel shows and I thought my laptop had the info, or at least I thought I had the stuff on the laptop.....
rolleyes.gif
 

Darryl Cassel

Well-Known Member
Joined
May 7, 2001
Messages
1,757
Location
Pennsylvania
Len

I'm using the results I had when fireforming loads in the standard Ultra case to come up with a ball park answer for Ric.
It should be real close for his 28" rifle.

Darryl Cassel
 

Ultraman

Member
Joined
Jul 20, 2001
Messages
23
Wyo,
I am in the process right now of building a 300 Ultra from the ground-up with a 30" Bbl but when I was doing load work with my old Ultra with a 26" tube I was getting 3025fps with the 220 MK's (RL-25 pwdr) and was getting distinct pressure signs when trying to exceed that. You having two more inches of barrel so the math in the above posts make sense. I have not played with the 240's yet
 

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