45acp velocity from a 16" rifle question, help settle an argument. pressure causes
I got into a little argument with a range buddy today on the velocity of a 45acp when fired from my Oly arms AR45 with 16" barrel.
He said "That bullet should be fly'en out of that 16" barrel"
I said "No, the fast burning Tightgroup powder is gone in the first few inches and friction would start to slow the bullet so it should not be much faster than a 1911".
He said "The bullet is long gone before the pressure drops and causes friction to slow the bullet".
I said "The Oly is a blowback gun so the bolt and carrier would start to move back the same time the 230g bullet moves forward. The presure would be 0 as soon as the gas can leak around the bolt and with no presure driving the bullet friction would take over".
Any thoughts? If not I will have to move a chronograph up on my huge list of "want to buys" and test for myself.
Thanks, Tim
I got into a little argument with a range buddy today on the velocity of a 45acp when fired from my Oly arms AR45 with 16" barrel.
He said "That bullet should be fly'en out of that 16" barrel"
I said "No, the fast burning Tightgroup powder is gone in the first few inches and friction would start to slow the bullet so it should not be much faster than a 1911".
He said "The bullet is long gone before the pressure drops and causes friction to slow the bullet".
I said "The Oly is a blowback gun so the bolt and carrier would start to move back the same time the 230g bullet moves forward. The presure would be 0 as soon as the gas can leak around the bolt and with no presure driving the bullet friction would take over".
Any thoughts? If not I will have to move a chronograph up on my huge list of "want to buys" and test for myself.
Thanks, Tim