Three more Page Publications Western digests: Gunsmoke Western Picture Library #4; Gunshot Western Library #27; and Western Adventure Library #7

Page Publications' Gunsmoke Western Picture Library #4 has a $0.20 cover price with a Keith Chatto cover.

A Trap for a Killer! is the first story in the issue, featuring Kid Colt, Outlaw.

The advertiser's date code on the rear cover is PP 1.72, which suggests this issue was on the stands very late-1971/early-1972.

The issue was reprinted shortly afterwards by Page Publications as Gunshot Western Library #27:

This issue has a $0.25 cover price and a new Keith Chatto cover.

The "5" marked in texta may be a newsagent's marking referring to the month of May. I picked this issue up in a batch which included Western Adventure Library #7, which also has "5" marked in texta:

So whilst it's inconclusive, for the moment I'm going to run with the idea that both these issues were on the stands circa mid-1972, which approximates the guestimates on AusReprints.

Western Adventure Library #7 also features a Keith Chatto cover.

Update: A further reprint of Gunsmoke Western Picture Library #4 is Gunsmoke Western Picture Library #7:

It is unclear whether this issue was published before or after Gunshot Western Library #27

Yet another edition was published as Fast Gun Western Library #1:

Again, the date is not known, but at least three $0.25 cover price editions were published in rather quick succession.

Update 9/9/2018: This issue was also published with a $0.30 cover as Western Illustrated Stories #8: