Yes, as I’ve already answered the bulk to you, need to fire some more. At least using the OTHER ammo that’s it well for you. Make certain THAT ammunition is STILL shooting true. Can’t figure out the a problem based on a ONLY a couple groups. You’ve established the 100gr. ammo has poor accuracy. You need to shoot the original ammunition once again to isolate the accuracy problem is fault of the ammunition or the rifle.
BTW: I wouldn’t trust the gun shop of making it certain the scope, rings & mount are installed & screws torqued correctly. Not unless you know them well. “Gun Store” guys aren’t always as knowledgeable as they THINK or present themselves to be. Some are very knowledgeable.
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