220 Swift Chamber

[Jdaniel343]

I just got some cerrosafe and cast my 220 Swift chamber. (Winchester heavy varmit, H&S stock, piller bedded with bedding block).
In the past this rifle shot 0.50 MOA or better with tuned up brass and handloads.
All dimensions from the cast are approx. 0.002 under sammi chamber specs except for the neck.
The chamber cast measures 0.262, my fired brass measures 0.258 to 0.259. My reloaded case measures 0.253.
Is this ok?
Thanks

 

[40X Guy]

Did your rifle quit shooting as good? I have the exact same rifle in a Swift, my chamber is .262, and fired brass mikes out at about .261 after springback. Loaded Win. brass is around .258 depending on lot, and loaded Norma Swift brass is .254.

If your fired brass is around .258-.259 your chamber should be .260. Maybe remeasure with another set of calipers,?

Also more info,... is barrel factory? Or has rifle been rebarrelled? Are you neck turning the brass for loaded diameter of .253?

Frank

 

[21shooter]

Hi J D, You might want to check OAL , could be some throat erosion.

John
www.21stcenturyshooting.com