20 vs 24 inch barrel

[KingGus]

I just dialed a load in my 24” Tikka 6.5 Creedmoor with 124 hammers. 43 grains of RL 16 with Lapua SRP brass and BR4 primers 2.889 COAL 2940 FPS with SD of 12 for 10 rounds. Sub MOA but it’s been too windy to really shoot for groups on paper the last three weeks so I’ve been shooting steel.

I think I may get more velocity with a faster powder but I have a bunch of 16 so I’m sticking with that for this year.

I like the 24” barrel to get the most out of that cartridge.


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I have an 18" Barrett 6.5CM and I get 2650 out 143gr eld-x reloads. Pretty good from such a short barrel.

 

[Stu]

The effective range difference at SAC between a 20” and 24” barrel with that bullet is whole 40 yards...... From 660 to 620 yards.


Barrel length “knowledge” is mostly myth.

Form, how are you defining "effective range" and what does the acronym SAC stand for?

 

[Formidilosus]

SAC= standard atmospheric conditions, I.E.- 29.92 barometric pressure, 59 degrees.


Effective range= minimum impact velocity required for bullet upset. In this case, 1,800 FPS.

 

[Stu]

SAC= standard atmospheric conditions, I.E.- 29.92 barometric pressure, 59 degrees.


Effective range= minimum impact velocity required for bullet upset. In this case, 1,800 FPS.

thank you, sir

 

[TxxAgg]

What did you go with?

 

[Tobey]

Do you currently or are you planning to ever shoot suppressed? If so 20" all day. My ridgeline creed has a 22" barrel, about as long as I can stand with a can on. Recently had an x bolt predator cut from 22" to 18", with a 7" can and some reloder 26 I'm not missing those four inches. My ridgeline needed to be pillar bedded before it would act right, it's the older model with the round receiver, really shoots now.