There was a thread on chopping barrel of 270 cal

[akaroa1]

@charliehorse I'm just about to do a short 6.8 SPC ( essentially a small case capacity 270 running lighter bullets ) and will have the luxury of starting with the factory Condender 23" barrel
I have a selection of factory ammo and will do the numbers on the stock 23" barrel
Then I have the luxury of being able to shorten in 2" increments at home and shoot on my 100m range out the workshop door and look at the numbers
Repeat until the length and velocity are what I'm aiming for.
The limited investigations I have done suggest that around 18" ( or slightly less ) should meet my needs
I can go as short as 15" and the Contender will still be legal
Being a small, modern efficient case I doubt the drop off in velocity will be very significant in the 2" increments

But it's the real world numbers I will generate from the un cut barrel that will inform the final length decision

Then thread and fit a DPT Mk2 and see if there really is a slight lift in velocity with the suppressor