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For the 185s we typically throated 100 thou extra. If you are using 220 or 230 pills you might even want to go longer that that.

At 100 thou extra, with high BC projectile shapes, you are no...

righto, so some "random" comments.

You seem to have settled on a 26 inch barrel.

Hopefully a 1:10 twist - that gives you a nice spread from 150gr all the way up to 230gr.

The one suggestion...

I ask again, what is the specific issue ?

Are you looking for a particular speed that is not achievable with a 16 inch barrel ?

"Optimal" is a question of opinion. Probably 22 to 24 inch if...

What exactly is the issue with a 16 barrel ?

I have a 14 inch 7-08, and would happily shoot it out to 400m plus with lighter projectiles.

At the end of the day all bullets drop, no matter what...