Walstr
12-01-2016, 07:07 PM
Greetings;
Thought I'd share my results from slugging a 'new' M1917 replacement barrel from Criterion Arms, Wisc. These are 'new old' stock, in that they were contracted to replicate original military issue. I plan to cast my own GC'd boolits. Now to find a mold. My previous blog responses seemed to suggest a bore riding design, 170+gr.
I deconstructed a 1977 Greek Surplus cartridge for the 150.4gr FMJ sample & used a fired case for the slug. The chamber neck seems to be .342"-.343". I feel this is accurate as I had thoroughly heated/annealed the case while filling w/lead. I'm interpreting the .046" dimension as "freebore", and the .100" from end of "freebore" to start of rifling as my "leade". The land grooves measured about .301"-.302". All measurements taken with name brand dial caliper.
--I formed an 1.25" long soft lead slug [from homebrew 12ga slugs] by drilling a 5/16' hole in Oak & lining it with a piece of aluminum foil; the slug falls out; then rolling it on top of table saw to shape it a bit & form a 'boattail' to enter the case neck.
--heated & filled a used case with soft lead, half way up the neck
--chambered case, dropped the slug & inserted a 9/32" x 36" drill rod, sheathed with spiral electrical tape; a perfect fit
--8 firm smacks w/18oz. hammer, unlocked bolt, persuaded case exodus with additional gentile smacks w/oak stick.
181821 181822 181820 181823
Thought I'd share my results from slugging a 'new' M1917 replacement barrel from Criterion Arms, Wisc. These are 'new old' stock, in that they were contracted to replicate original military issue. I plan to cast my own GC'd boolits. Now to find a mold. My previous blog responses seemed to suggest a bore riding design, 170+gr.
I deconstructed a 1977 Greek Surplus cartridge for the 150.4gr FMJ sample & used a fired case for the slug. The chamber neck seems to be .342"-.343". I feel this is accurate as I had thoroughly heated/annealed the case while filling w/lead. I'm interpreting the .046" dimension as "freebore", and the .100" from end of "freebore" to start of rifling as my "leade". The land grooves measured about .301"-.302". All measurements taken with name brand dial caliper.
--I formed an 1.25" long soft lead slug [from homebrew 12ga slugs] by drilling a 5/16' hole in Oak & lining it with a piece of aluminum foil; the slug falls out; then rolling it on top of table saw to shape it a bit & form a 'boattail' to enter the case neck.
--heated & filled a used case with soft lead, half way up the neck
--chambered case, dropped the slug & inserted a 9/32" x 36" drill rod, sheathed with spiral electrical tape; a perfect fit
--8 firm smacks w/18oz. hammer, unlocked bolt, persuaded case exodus with additional gentile smacks w/oak stick.
181821 181822 181820 181823