Originally Posted by bowhunthard
Hello, I have a pre-'64 220 Swift model 70 hunter grade with a 26" barrel. Does anyone know for sure what twist the barrel has? The throat seems to be extremely long (eroded?) and the only bullet I have tried that will produce a .030" jump to the lands is the Nosler 69gr custom competition. I was wondering if the 220 would be able to stabilize this bullet. Probably going to load @ about 3100 fps.
Thanks for the info.
Probably not .
Most of the early 220 swifts and 22/250s were 1 in 14 twist for 45 to 55gr @ 3700ft/sec +
They did not make the heavy bullets back then.
If your wanting to shoot 70gr bullets @3100 you will need a 1 in 7 or 1 in 8 twist
and you might get buy with a 1 in 9.
Also the throat is longer normaly because in there day these were very hot loads.
Don't worry to much about freebore ! Just fire form your brass and neck size only
and it will supprize you how well it will shoot unless the barrel is used up.
J E CUSTOM