After shooters use Muller Chokes for some time I always get asked the same three questions: Why do your chokes never work their way loose between stations? How do they stay so clean? How is it possible to be able to get such hard, consistent breaks at extreme ranges for the amount of constriction?
These questions are being asked because shooters are not used to having these benefits from the conventional choke manufacturers such as Briley, Comp-N-Choke, Extreme Chokes, Rhino, Kicks, Seminole, Teague and Pure Gold just to name a few.
I will answer these three questions over the course of my next three posts. Let's start with the first one which is why Muller Chokes stay firmly screwed into the gun barrel.
Loosening/not loosening: All conventional chokes made by companies above are made of the old 17-4 ph stainless steel concept, while most shotgun barrels are made of 4140 steel. Both the choke and the barrel heat up during shooting. Because they are both "steels" per se, they heat up at approx the same rate. However, this is not true of the cooling process. The two materials have different contraction rates. When steel gets hot, it grows, when it cools, it shrinks. Although it may only be a few thousandths of an inch, the two materials shrink at different rates, which in turn, causes a gap between choke tube and barrel. Then, another shot is fired and more loosening occurs. Before you know it, the choke is loosened several turns or more. Muller Chokes will not do that because they dissipate heat so rapidly--it is almost as if they remain cool at all times thereby remaining as ONE with your barrel.
Tomorrow, I will address the second of the three most commonly asked questions listed above.