No, pressures will be a bit higher, but nothing to worry about if you load at low pressures, say 7500psi and under. With pistols, a grain can make a big difference. We have a little more lee way with shotguns seeing how our pressures are under 10,500 [ max for a 12ga ]. There are many loads with IMR 700x that are from 5000 to the 7500 range with a 7/8 or 1oz load [ all anyone needs ]. Many modern reloaders consider 5000 to 6000psi too low a pressure for good burns. And some are dirty but who cares, we're not shooting autos. What gun do you have ? Are you sure it has 2 1/2" chambers ? And some of our members shoot modern high pressure ammo in their Parker Damascus barrel guns with no ill effects. Most claim it has to be low pressure. To each their own, but a little more info on your gun would help. And someday maybe you'll also step up to a Parker.
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Paul Harm
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