Quick Load help please

[Smitty192]

Need a little QL help please.
I'm finalizing my AR308 barrel and I'm debating a 16" or 18" barrel. I don't think there is going to be a large difference in velocity, but I want to confirm.

Default case capacity
IMR4064
175 SMK
2.80 OAL

Barrel time nodes
16.0" 0.5527 0.6096 0.6879 0.7458 0.8232 0.8821 0.9585
18.0" 0.6185 0.6809 0.7715 0.8348 0.9245 0.9886 1.0774

Thanks for the help

 

[doc88]

Hope this helps

 

[Smitty192]

Hope this helps

Thank you very much. Would you mind changing the case capacity to 55 grains? I think the FGMM load is around 42 grains. I think with the adjusted case capacity, it should time out close. My guess is around mid 2400s for the 16" and and upper 2400s for the 18".

Thanks again. I appreciate the help.

 

[doc88]

I assume you meant the maximum case capacity measured in grains of H20 which changes usable case capacity

 

[Smitty192]

I assume you meant the maximum case capacity measured in grains of H20 which changes usable case capacity

Yes, Sir. Grains of H2O for case capacity

 

[doc88]

That's what I did on second attachments.