[gwpercle]

When you are developing "light loads" , make sure (100% sure ) that your lightly loaded bullets exit the barrel . Light loads can possibly stick bullets in barrels and jacketed bullets are easier to stick than lead , coated lead 0r plated . If a bullet does stick ... it must be pushed out with a range rod ,,, Do Not Try and Shoot it Out ... Bad Things Will Happen .
Except for this one thing , down loading isn't dangerous or damaging .
Just get enough powder in there to make 100% sure the bullet exits the barrel and puts a hole in your target ! Trust Me ... I did it once ... Too light loaded , I didn't fire but one ... had to go home for Rod and pull the 49 remaining bullets ...
Called ... Learning The Hard Way !
Gary

 

[gwpercle]

You will most definitly Not Need magnum primers to ignite HP-38 .
If the load data you are looking at was developed with magnum primers you might get a few fps lower velocity and a little less pressure .
Powders that Need magnum primers are ones like H110 and 2400 .
HP-38 is a easy to ignite powder ... double check that data ... magnum primers with HP-38 just doesn't sound right ... but maybe the magnum primers were all they had ... shortage you know !
Gary