John McCorkle
01-04-2014, 03:14 AM
Thank you guys for compiling such a great site. I've spent some time looking around and have been a passive "learner/reader" for some time now and have spent the past few years casting for pistol. Loving it by the way.
Now I've come to a problem that I haven't been able to find anything for.
So I am most of the way through a 300 blackout pistol build. It's my first 300 build and I have to say I am very excited about the potential for the round. What is most exciting is not only what it can do out of an 8 inch barrel (what I have) but how inexpensive it will be to reload and even cast my own bullets for.
This is where my question comes from though. when I got my new barrel from Santa this year, I slugged the bore to check diameter so I know what to size the cast bullets to. I know from at least some experience that fit is king when it comes to casting...BHN, velocity, gas check, ect...they all play a part but fit is most important. The barrel slugs at .305...and that kinda concerns me. I bought the barrel from MAS defense (or Santa did I should say). I know cast boolits should be around .001 to .002 above bore size to allow perfect fit. what now? This seems like it could be for one out of spec, but I don't know...has anyone else had this experience? Will shooting jacketed bullets be safe through this one? (my understanding is most spec 30 cal bores run .307-.3075 range.)
will sizing to .308 be sufficient for a good solid alloy of wheel weights and a bit of tin/antimony added to sweeten, water dropped, heat treated, and gas checked (which is what I have going on by the by) I have a .309 sizing die but that is .004 over bore size...seems a bit much but want to see what you guys think
thoughts?
I am certain there are may factors that go into play so please forgive my ignorance if I have overlooked anything, just trying to learn
Now I've come to a problem that I haven't been able to find anything for.
So I am most of the way through a 300 blackout pistol build. It's my first 300 build and I have to say I am very excited about the potential for the round. What is most exciting is not only what it can do out of an 8 inch barrel (what I have) but how inexpensive it will be to reload and even cast my own bullets for.
This is where my question comes from though. when I got my new barrel from Santa this year, I slugged the bore to check diameter so I know what to size the cast bullets to. I know from at least some experience that fit is king when it comes to casting...BHN, velocity, gas check, ect...they all play a part but fit is most important. The barrel slugs at .305...and that kinda concerns me. I bought the barrel from MAS defense (or Santa did I should say). I know cast boolits should be around .001 to .002 above bore size to allow perfect fit. what now? This seems like it could be for one out of spec, but I don't know...has anyone else had this experience? Will shooting jacketed bullets be safe through this one? (my understanding is most spec 30 cal bores run .307-.3075 range.)
will sizing to .308 be sufficient for a good solid alloy of wheel weights and a bit of tin/antimony added to sweeten, water dropped, heat treated, and gas checked (which is what I have going on by the by) I have a .309 sizing die but that is .004 over bore size...seems a bit much but want to see what you guys think
thoughts?
I am certain there are may factors that go into play so please forgive my ignorance if I have overlooked anything, just trying to learn