Home Forums Reloading Varmint Rifles pet 220 swift loads

Regarding H380, I never had any issue with temperature sensitivity. Back in those days, I'd never heard of temperature sensitivity, never experienced it in any measurable way, so for practical purposes, it didn't exist: temperature sensitivity hadn't been invented on the internet yet. That's evidence for our propensity to overthink stuff and create problems where there are none.

I tried H414 / Win760 but they didn't work as well with 50s and my first Swift wouldn't shoot 55s or heavier worth a darn.

Regarding seating depth, I wonder if the long sloping shoulder does not center the bullet in the chamber behind the rifling repeatably until we actually shove the bullet into the rifling and let the discharge reshape the case to the chamber as needed. Who knows? Or it could be that the long tapered case doesn't give consistent ignition but shoving the bullet into the rifling increases resistance increasing consistency. Who knows 'bout that, either? Things happen fast in there at 60K PSI.

This in my opinion describes my experience to a tee. Good post.

Back in the day I had never heard of temp sensitivity either, all I knew is that I could work up a good load with H380 through my chronograph.........add 10 degrees and the bolt locks up. think back then I just called it Chitty powder

In my new 8-twist 22-250 AI, about the case-volume equivalent of the Swift, R17 (because I have a lot of it), and though I’m not finished working it up yet, is showing very good promise in terms of both accuracy and velocity with 65-70-gr bullets.

my 220 swift in a Ruger no.1 is done this rifle shoots good with h414 and 60 grain bullets. my question: has anyone used reloader 17 and h414 and notice if either powder is a lot faster ? book shows reloader faster but books are not always correct.thanks,Pete53

42 grains of IMR 4350 and the 52 grain Sierra HPBT was my go- to load for my .220 Swift for years. My very first all in one ragged hole group was with this load.

This was over four decades ago and lots of powders have came since then but this was a gem dandy load then and still is today.

One of my favorites is-
Rem brass
Fed LR primer
39.5 grains 4064
50 grain ballistic tip

For over 30 years, my favorite powder has been 4064. There are likely better powders that equal it’s accuracy and actually run through a powder measure, but it works. My favorite these days is 38.5 gr with 55 gr Nosler Ballistic Tips.