Far easier to use a dremel and cut n snap that way you don't mess around with the consistancy of the metal. Also you only need to do half at a time. Why waste a coil when a 1/4 or 1/2 would do the job. Then apply the heat ONLY to cut section to finish the spring properly again on the dremel. Thats the way Mr Pope himself would do it
I've got an article somewhere which he himself did in airgunshooter.
I'll dig it out and post link