Sorry but the manual is quite clear what the MAX load is and that you should never exceed that load. Nowhere in the manual does it describe the G4 as a "Magnum ML" but i does say never to exceed 150gr of real black. A max load of BH209 makes less peak pressure than 3 pellets but yields around the same speed. It wont even break 27Kpsi in a 45 with a sabotless 300gr bullet. It makes even less in a 50cal sabot load. The entire "MAG" hype was always based around pellets and pushed heavily by cheaper imports. CVA continues with this line of BS today while at the same time wont allow 100gr of ANY 3FG in their rifles.
Your CVA gun utilizes a 209 shotgun shell primer to ignite the powder charge (or musket caps in appropriate markets). It is fully magnum capable*. This means that you can use the “magnum” charge of 150 grains equivalent of pelletized blackpowder substitutes.
The maximum load in CVA break-action guns, and any other CVA in-line gun designated as a “Magnum” is 150 grains by volume. This maximum load is generally known as the “magnum” load and is best suited for pelletized powder due to the more efficient burning characteristics of the powder pellets. Magnum loads of loose powder may be shot but are not recommended becauseof their inefficient and incomplete burning of the powder.
120gr by volume of BlackMZ also weighs more than 120gr by volume of BH209. Roughly 21gr more IIRC. ( About 105gr vs 84gr?) As total ejecta weight increases so does recoil. Powder weight is included in all the recoil calculators ive found. Although i find it a little hard to believe its "pure hell" worse since BH209 will also achieve higher velocity.
Using their numbers and just 7lbs for the rifle, its about 10% more recoil energy with BlackMZ
