<BLOCKQUOTE id=quote<font size=1 face='Verdana, Arial, Helvetica' id=quote>quote:<hr height=1 noshade id=quote>Middle of the road powders like 3031, H4350 or IMR4350,Rel19 should be fine in a rifle..Anything slower will not work correctly. <hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face='Verdana, Arial, Helvetica' size=2 id=quote> oldelkhunter, if 3031 is a middle of the road powder, then IMR4350, H4350, and RE 19 are NOT!! What the people are afraid of with a slow powder in a semi -auto is not slamming the bolt back too hard. What they are concerned about is having the bolt try to open before the pressures have fallen to a safe level. This could cause two possible efffects-one is dumping gas into the action; the other is tearing the head off of a case because it is still stuck to the chamber walls when the extractor tries to pull it out (except for the U.S. Rifle Cal. .30 M1, in which case you are going to bend the operating rod....

Keep yore powder dry!!