Updates received from Kaj Eriksson, November 2018:

www.kanoner.nu (Swedish)

(Part Four, Sweden, p331)

About your list of cannon markings. The "H" was marked by two Swedish cannon foundries, the smaller Huseby Bruk and the much larger Hellefors Styckebruk.

H On trunnion. For Huseby Brug, a gunfoundry in Sweden. (Stockholm), 18th c. Swedish PH-EA
Should be:
H On trunnion. For Huseby Bruk, a gunfoundry in Sweden. (Växjö) owned by De Tries (most of the guns were exported to Holland), 18th c. Swedish PH-EA
late 1600-1750, all cannons marked on trunnions with H after 1750 - 1840 are from the larger foundry, Hellefors Styckebruk, Södermanland

and

H On trunnion. For Hellefors Styckebruk, a gunfoundry in Sweden. (Hälleforsnäs, Södermanland) started by Abine Noij most 18th century guns was sold to the Swedish Navy and Army. 17th to 19th c. 

HELLEFORS STYCKEBRUK (Södermanland)
”H” , ”HF.SB” och ”HF”

HUSEBY BRUK (Småland)
”HB” "H" (H is only before 1750).

ÅKERS STYCKEBRUK
”W”, ”GK”, ”GC”, ”ÅB”, ”ÅKER”

NORSHAMMARS BRUK
”GSN”, (Gerdt Störnings Norshammar), ”G”, ”GS” (Gerdt Störnings) ev även ”VB” (von Berchner)

STAVSJÖ BRUK
”VB” (von Berchner) ”G” och GS” (Gerdt Störnings) During 1834 to end 1859 whole name ”Stafsjö”

EHRENDALS STYCKEBRUK
”E B”, ”I E”, ”E C”, ”I E C”, ”O E C”, ”J E C” and ”E B R” 

FINSPÅNGS STYCKEBRUK
”F”, ”Finspong”, ”LDG”, ”DG”