If you refer to Pedersoli's Kodiak muzzleloading double rifles, I have owned three, presently owning two.
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Pedersoli offers two (perhaps three??) distinct quality levels of Kodiaks. My first was a lower quality (chemically colored, semipistol grip, utility wood, etc.) .58-caliber rifle. The rifle shot 625-grain bullets with astonishing accuracy and surprising non-futzing regulation. While well made in terms of value for the money, trigger action was terrible and fit of wood-to-metal was marginal.
Were I not enmeshed in the "no substitute for cubic inches" universe and the overall length less, I would still own the rifle.
My next two rifles have been Kodiak Safari high grades, .72-caliber, straight grip, silvered locks, much better wood and assembly - that is, well worth the additional cost of higher grade. I have used one of the rifles, the other being N.I.B. as "back-up." Again, the rifle shooting my custom 775-grain bullets was astonishing accurate and consistent out of the box. Brutal recoil that bruised my shoulder from clavicle to beneath my elbow force me to have work done. Boy, I'm glad I did. The rifle is more attractive; recoil is acceptable; much better sights allowed me to regulate the rifle. From a bench unsupported, right-left (I always shoot in this sequence) obtains cloverleaf at 50 yards and three-inch group at 85 yards. I have not fired at longer distances - yet.
My biggest concern with the Safari was the previously mentioned recoil forcing the second barrel's bullet dangerously forward. My custom bullets were designed to obviate the problem. My verification procedure totaled 40 shots (and two clearing shots) where one barrel remained loaded and unfired while the other was fired 20 times with a more severe load than my regulated one. I measured bullet's location with loading rod after each shot. No movement. That was that.
Regarding quality control, remember the N.I.B. rifle in my safe? I haven't touched it. And its reason for existence is invalid. The Safari I used ain't gonna have problems. I'm convinced of that after two years of service. So the back-up is disposable.
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Reverting to several years ago, would I buy a Kodiak again? Since Montana's special restrictions hunting seasons allow two-shot muzzleloaders and Montana otherwise has no muzzleloading big game seasons, I would buy a higher grade Safari in a New York minute.
Hope this helps.