Since I'm very fond of my Savage Impulse rifles, I decided to build a .20 cal Impulse and the 20-250 cartridge was the perfect fit for my needs.
The .308 Impulse predator rifle didn't stay .308 for very long.
To add to the builds uniqueness, the 20-250 chambered barrel I acquired is a large shank barrel.
I was going to have the barrel profiled, shortened and rethreaded with small shank threads, but I wanted to see if a large shank barrel would fit without stock modification.
With the help of a fellow member, I bartered for a large shank barrel extension and recoil lug to make this build happen and to also get measurements to make a large shank QC barrel kit, like the small shank QC barrel kit I made.
One issue I had, was the issue of extending the large shank barrel tenon threads, as the large shank threads are shorter than small shank tenon threads and you can't get proper headspace without extending the large shank threads.
I bought the required Hex Die and extended the threads the old fashioned way, by hand in my viper barrel vise.
The very heavy and long 1" OD S/S match barrel fits snugly in the stock and isn't free floating.
I thought I was going to have an issue with the large shank barrel nut fitting without stock modification, but it fit snug like the barrel.
I formed some brass, set headspace and then made some 55 gr dummy rounds to check magazine function.
Had to adjust the mag feed lips a little bit and it feeds like a champ now.
Going to load a few rounds with the 55 gr bergers and hit the range on the way upstate.
If it's a go, I'll mount the Halo X50 and try to do some coyote hunting with it.
SJC
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