I'm fighting an issue I just can't seem to put my finger on for a solution, hoping someone on the hide may have some input.
A few years ago I got a ridiculous deal on a YHM Phantom M2 .30cal QD stainless suppressor, it was too good of a deal to pass up. My idea was to use this suppressor on my long range rifle(s) that I wasn't worried about keeping lightweight (suppressor weighs a beastly 25oz).
The problem I am having is that I am getting an unpredictable (timing) but repeatable POI shift after I make my first 4-5 shots. Say I make 5 shots in fairly rapid succession (~15-20sec apart), I will have a nice tight group for those first shots and then suddenly I will get a POI shift about 3" low and all subsequent shots will group in this area until I let the rifle sit for maybe 5 or so minutes. My theory was that the barrel was getting hot and the heavy suppressor was making it droop causing this shift, and then after letting it cool it would go back to the proper POI. That was until I talked to a few people who have this same can on various bolt guns that claim no matter how hot they get, POI remains predictable and don't see this same shift that I am seeing. Furthermore after those first 5 or so shots, I can still grab my barrel, it's not that hot. The barrel on the primary rifle that this gets used (6.5cm RPR) is also a quite heavy profile (LRI 24" and .83" at the mount shoulder).
I have also used this suppressor on my 18" Proof Research 5.56 carbon fiber barreled AR and it exhibits the exact same properties but much more pronounced, with the POI shift being greater than 9" but the barrel does get VERY hot. PR also confirmed that when the resin reaches the point where it becomes elastic, a POI shift such as this is fairly common. My main concern is with this issue on my 6.5cm bolt gun.
A few years ago I got a ridiculous deal on a YHM Phantom M2 .30cal QD stainless suppressor, it was too good of a deal to pass up. My idea was to use this suppressor on my long range rifle(s) that I wasn't worried about keeping lightweight (suppressor weighs a beastly 25oz).
The problem I am having is that I am getting an unpredictable (timing) but repeatable POI shift after I make my first 4-5 shots. Say I make 5 shots in fairly rapid succession (~15-20sec apart), I will have a nice tight group for those first shots and then suddenly I will get a POI shift about 3" low and all subsequent shots will group in this area until I let the rifle sit for maybe 5 or so minutes. My theory was that the barrel was getting hot and the heavy suppressor was making it droop causing this shift, and then after letting it cool it would go back to the proper POI. That was until I talked to a few people who have this same can on various bolt guns that claim no matter how hot they get, POI remains predictable and don't see this same shift that I am seeing. Furthermore after those first 5 or so shots, I can still grab my barrel, it's not that hot. The barrel on the primary rifle that this gets used (6.5cm RPR) is also a quite heavy profile (LRI 24" and .83" at the mount shoulder).
I have also used this suppressor on my 18" Proof Research 5.56 carbon fiber barreled AR and it exhibits the exact same properties but much more pronounced, with the POI shift being greater than 9" but the barrel does get VERY hot. PR also confirmed that when the resin reaches the point where it becomes elastic, a POI shift such as this is fairly common. My main concern is with this issue on my 6.5cm bolt gun.
