09-11-2018, 08:07 PM
Check page 33 of Volume 1 of the Grendel reloading handbook. The curves adhere rather closely to the averages of actual test data by Alexander Arms a long time ago.
Also, pay heed to Sinclair's caution about variability between rifles of even the same barrel length.
That variability, in small sample sizes (like what we can get here), could result in falsely concluding that chopping 2" off a 24" results in an increase of velocity or a huge drop in velocity.
Calculators, for the most part, are good at showing the average change in velocity, especially over the 5 - 10 % change in barrel length posited in the OP.
Also, pay heed to Sinclair's caution about variability between rifles of even the same barrel length.
That variability, in small sample sizes (like what we can get here), could result in falsely concluding that chopping 2" off a 24" results in an increase of velocity or a huge drop in velocity.
Calculators, for the most part, are good at showing the average change in velocity, especially over the 5 - 10 % change in barrel length posited in the OP.
shootersnotes.com
"To those who have fought and almost died for it, freedom has a flavor the protected will never know."
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"If at first you do succeed, try not to look astonished!" -- Milton Berle
"To those who have fought and almost died for it, freedom has a flavor the protected will never know."
-- Author Unknown
"If at first you do succeed, try not to look astonished!" -- Milton Berle