stuartyboy Posted June 26, 2017 Report Share Posted June 26, 2017 Could anyone please tell me if for following reloading data and all intents and purposes, if the newer Maxam PSB+2 powder is the same as the older PSB2 powder? Thanks Quote Link to comment Share on other sites More sharing options...
Continental Shooter Posted June 26, 2017 Report Share Posted June 26, 2017 Nope, is faster. What gauge you wanna load for? Quote Link to comment Share on other sites More sharing options...
stuartyboy Posted June 27, 2017 Author Report Share Posted June 27, 2017 Thanks for the reply. It's for a 10 bore short cartridge. Would substituting PSB+2 for PSB2 cause dangerous pressures? Quote Link to comment Share on other sites More sharing options...
neutron619 Posted June 27, 2017 Report Share Posted June 27, 2017 (edited) Depends how much you use, but probably. All other variables being equal, faster powder will produce the same volume of gas from the same quantity of powder in a shorter time. Hence, it's "faster". Having said that - it is never that simple, so please don't take the above as me implying that I think it is. This is likely to mean (but doesn't guarantee) more gas in roughly the same space at the point of firing. If the shot column takes X amount of time to get moving (i.e. to enlarge the space which the combustion gas is occupying and lower the pressure) then the powder which produces that gas 20% faster will produce a pressure 20% higher. It's not that simple though. Complications include the fact that higher pressure will tend to mean that the resistance to moving the shot column is overcome sooner (so pressure starts to drop sooner). They also include the fact that smokeless powder, leaving little to no residue, empties the space in which it existed previously as it burns, marginally reducing the pressure by increasing the volume available for combustion gases. The faster this happens, the more significant the effect. Finally, higher pressures tend to cause higher pressures by increasing the burning rate of the remaining powder. In short, it's a minefield, extremely difficult to predict and attempting to do so is best avoided. Measuring the outcome of changes to powder weight, volume, geometry is of course possible - assuming you survive the test! Edited June 27, 2017 by neutron619 Quote Link to comment Share on other sites More sharing options...
Continental Shooter Posted June 28, 2017 Report Share Posted June 28, 2017 I agree with Neutron: guessing in reloading is always a dangerous game I assume you're loading steel on your 10 ga? If that's the case, coupled with the fact i only load 20ga (lead & ITX) and use the 12 only for testing (lead only ) l wouldn't even be able to attempt guessing a load... If it's only lead you're loading then it shouldn't be too hard to work something out using the adjustment i made for 12 & 20 loads cheers Quote Link to comment Share on other sites More sharing options...
stuartyboy Posted June 30, 2017 Author Report Share Posted June 30, 2017 Thanks for your help guys, much appreciated Quote Link to comment Share on other sites More sharing options...
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