6 dasher coal question

[tikkaman308]

I'm having my dasher built at the moment, my reamer has .115 freebore and chamber length is 1.555 according to my reamer print. The neck dimension is.264 so I know I'll have to turn my necks. My gunsmith wants 2-3 loaded rounds just to test fire the gun after he's done with it, just to test function . My problem is I'm not sure how long I should load these rounds,my thought is to use some data found in the berger manual for coal and load a mid range load with varget. Anyone have any advice on where to start.

 

[Cfshooter]

What bullet and powder do you have?

 

[tikkaman308]

I have 95 gr.bergers, 105 gr. Barnes match burners, Varget ,H322.. I am going to get some Berger 105 gr. Soon but this is what I have on hand

 

[Cfshooter]

I have 95 gr.bergers, 105 gr. Barnes match burners, Varget ,H322.. I am going to get some Berger 105 gr. Soon but this is what I have on hand

I don’t have experience with those but I think 29 gr Varget seated at the boatail/shoulder junction should be safe for any of them.