300 RUM 220, 240 gr SMK velocities.

[*WyoWhisper*]

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]

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

 

[*WyoWhisper*]

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.....

 

[Boyd Heaton]

I would say about 3100 with the 220's too.I could get 3050 safely in a 26" tube.No clue on the 240's.

 

[Len Backus]

However, Darryl, wasn't your result in the larger capacity, improved case?

 

[Darryl Cassel]

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]

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