Paul Cat Posted July 13, 2020 Report Share Posted July 13, 2020 Can someone explain why the impact point changes when a moderator is removed? On my .17 hmr I noticed a 6" higher shot fall at 100 yards, I assume it's down to the Fizzicks of gases swirling in the moderator as the round passes through but I could (most likely) be talking through my hat. Quote Link to comment Share on other sites More sharing options...
Popsbengo Posted July 13, 2020 Report Share Posted July 13, 2020 barrel harmonics, the vibration of the barrel is changed by the large lump of metal screwed on the end (or not). A few thou of difference at the muzzle is a few inches at distance The bullet is ahead of the gasses travelling at supersonic speed so no interference from them. Quote Link to comment Share on other sites More sharing options...
Paul Cat Posted July 13, 2020 Author Report Share Posted July 13, 2020 9 minutes ago, Popsbengo said: The bullet is ahead of the gasses travelling at supersonic speed so no interference from them. I knew that (maybe) 😁 Thanks. Quote Link to comment Share on other sites More sharing options...
No i deer Posted July 14, 2020 Report Share Posted July 14, 2020 My rifles usually have a point of impact change about 1.5 inches at 100yds going from a muzzle brake to a mod and vice versa Quote Link to comment Share on other sites More sharing options...
palo Posted July 14, 2020 Report Share Posted July 14, 2020 On my 308 my point of impact is usually about 2 inches lower with the mod on. I did work up a load with berger 155.5 bullets that had the same point of impact with the mod on and off. I still can't figure that one out. Quote Link to comment Share on other sites More sharing options...
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