I’m new to CZ’s and reloading 9mm, so I’ve been absorbing everything I can from the forums. I ordered sample packs from Blue Bullets and made up 100 125g RN over 3.8g of Sport Pistol to an OAL of ~1.110 (based on what I’ve ready others were doing). Last night I finally had time to plunk test my 2023 Shadow 2 Optics Ready. Much to my surprise, it plunked out to 1.155! That’s longer than a forum member’s chamber after he had it reamed. Anyone else plunk tested an Optics Ready Shadow 2? I’m wondering if CZ finally increased the chamber depth in the 2023 models, or maybe the OR Shadows?
Based on my plunk test, I made up 25 rounds of 147g RN BB’s with 3.1g of Sport pistol at OAL of 1.146, and 25 more at 1.140. They all functioned fine, but shot about an inch or more left at 20 ft compared to the 125g BB’s or the American Eagle 115’s I’ve been shooting.
Here’s my main question. Would the longer OAL I loaded the 147g Bullets to vs the 125g move the point of impact to the left, or would the bullet weight difference cause this? I’d like to keep my point of impact the same across different rounds. Should I (or is there a reason not to) shorten up the OAL of the 147g to the 1.110 (.045 below max plunk) to match the 125g and see of that would move the POI, or is this more than likely a bullet weight issue moving POI?
Thank you for sharing your input!