OK, I gotcha.
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Steel is steel, velocity is not really the main issue. When the pellets get to the choke, the choke becomes an obstruction and the pellets at the front start to slow down while the pellets at the rear are still at speed. The pellets at the front can't absorb the energy like lead will. The pellets try to move sideways which can cause damage to the choke and/or barrel.
Smaller pellets are easier on the barrel than larger pellets. Chokes with a more open constriction can handle the pressure better than those with a tighter constriction.
The plus side to steel pellets is that they don't deform and patterns can be tighter than with lead pellets.
If your barrel has interchangeable chokes you have it made. Just use a choke that is more open than Full, Improved Cylinder or Modified work well. Be sure to use lube on the choke tube.