Bluntwolf, you forgot White Fang and the Gold Diggers (La spacconata), which, I think, was shot back-to-back with White Fang and the Hunter. Both have same locations, many same actors and Alessandroni's score is very much alike. White Fang and the Hunter is rock bottom, a comedy westerns starring Pedro Sanchez! Now who would like to watch a film starring him!? But of course it has good score and a scene where Sanchez is kissing horse's ass (possibly the only funny scene he ever did), so it's not all bad. God Diggers is better and more serious adventure/western starring Robert Woods with Sanchez only in a supporting role. Snowy landscapes and beautiful score, average storyline. Not great but not that bad, either. Both were inspired by Lucio Fulci's White Fang.
Killer Calibro 32 is his only really good SW, murder mystery western with P.L.L. as a gunfighter-detective with a pistol made of silver and shooting silver bullets (hence character's name "Silver")! The Price is Death (with Garko as Silver) is a semi-sequel to this. Great animated opening credit sequence also. Days of Violence is below average in my oppinion, to US-like and P.L.L. is not too good in this one. Turn... I'll Kill You (Voltati ... ti uccido!) is low-budget effort with ok story, lots of action and Fernando Sancho doing one of his best roles. Trashy fun. Lynching (Carogne si nasce) is slow-moving, boring B-western.
His Sci-Fi films are indeed worth experiencing! Severing Films (US) is going to release his Bestia nello spazio ("Beast in Space") on DVD. Psychedelic rip-off of French art/sex movie La Bete (starring Finnish cult fav. Sirpa Laine) set in space and starring... yes, Sirpa Laine! Psychedelic stuff with horny faun, exploding golden cyborgs, softcore sex scenes, Vassili Karis, ultra-strange electronic/ambient sountrack, mad deadly computer god etc. One of the strangest trash movies I've ever seen!
I can't tell if Brescia was any good as a director as he was always forces to work with such miserable budgets. He made few good movies and lots of trash films, some good and enjoyable, some just boring.