I spent the day at the range with my 5 screw Model 15 Combat Masterpiece. It usually sleeps with my Model 18 in the safe for about 20 years.
I shot 200 rounds of UMC 130 grain ball ammo out of it (and 100 rounds of same out of a M-10-2 4" pencil barrel) sighting it in for up coming revolver training week!
The Model 15 was easily adjusted up to center little bitty 2" groups in the head of a 1/2 scale shilo DA at 15 yards after 50 rounds or so. This gun RIPS and I replaced the mainspring with a Power Custom tapered one I've had extra for 15 years banging around in the bag and stripped and XF-7 lubed it before this training regimine began last week-the course under Jim Cirullo is in April. I get an RCBS measured pull of 6.5 pounds DA and being a .38spl. it goes BANG every time!
I chose this gun over a Python because I think it will be more reliable ( I really didn't want to use the heck out of my Pythons for 100 presentations a night and 2K rapid fire in 3 months) and is lighter than a couple snakes.
BTW I chose to use Ball ammo as it slips in and out of the gun like ... thru a goose, the bullet does not tend to pull like a 158grain does and of course recoil ain't as bad when you are ripping them off! AND they were CHEAP-$120 per 1000.
I have tested this old M-15 at 25 yards 25 years ago and it will shoot 2" groups at 25 yards rested SA ( I like baricade supported)with match wadcutters.I have .38spls that will do better: A 6" Python Whitetailer, a S&W Model 52 , a Colt Officer's model Match , and a Bomar ribbed barrelled S&W model 17 PPC gun.I don't think I can do it any more except with the scoped Whitetailer
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Yup a Model 15 is a wonderful gun, I wish I had a pristine 2" one!