Originally Posted By: spotstalkshootI have some 29 gr Kindler .050 boat tails that are being damaged during seating op. Brass is new nickel R/P outside neck measures .192 av before and after neck size. Inside neck .170. Neck wall varies from .010-013. My 556 formed brass av .196 after neck size, inside .170,.011-012 thick and is not scraping jackets. Why are the inside same but outside no change is this new brass not sizing?
The sharp edge of the neck can score bullets - I have pulled 30 calibre match bullet fron brass that was chamfered with a 14° VLD Chamfer tool... and nickel is harder than brass or gilding (jacket) metal.
I do not chamfer anymore - I usse the Lyman "M" die, but they don't make it in .17 cal.
If you can find anything that is conical at the point, and use it to make a light flair to the mouth, that will solve the problem.
Also, backwards chamfering can work too. (turn the tool counter-clockwise in the mouth).