Velocity and accuracy studies? - Page 2

**44 AMP** · January 11, 2023, 09:27 PM

Has the OP,. or anyone, bothered to ask Norma??

IF so, what did they say?

if not, why not?

74A95 · January 12, 2023, 03:50 PM

There is some laddered 45 data here:

https://www.shootingtimes.com/editor...-shooter/99418

**Unclenick** · January 12, 2023, 04:53 PM

Interesting about the 150 mm barrel. The CIP specs are all about proofing and specify a standard twist but no standard barrel length. Unlike SAAMI, they have no standard velocity ranges for bullet weights, so they may not care about it. I looked up 45 Auto in QuickLOAD's table of test barrels, and all the labs listed there use 150 mm, except Keil, Germany, which uses a 200 mm barrel. I don't know how they came to choose that number over 127 mm, but it may have something to do with some particular guns the Europeans commonly chamber for 45 Auto.

L. Boscoe · January 13, 2023, 01:34 PM

I have only asked Norma when they plan to offer it again. Time to get the chronolograph out.

January 11, 2023, 09:27 PM	#26
44 AMP Staff Join Date: March 11, 2006 Location: Upper US Posts: 28,860	Has the OP,. or anyone, bothered to ask Norma?? IF so, what did they say? if not, why not? __________________ All else being equal (and it almost never is) bigger bullets tend to work better.

January 12, 2023, 04:53 PM	#28
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,063	Interesting about the 150 mm barrel. The CIP specs are all about proofing and specify a standard twist but no standard barrel length. Unlike SAAMI, they have no standard velocity ranges for bullet weights, so they may not care about it. I looked up 45 Auto in QuickLOAD's table of test barrels, and all the labs listed there use 150 mm, except Keil, Germany, which uses a 200 mm barrel. I don't know how they came to choose that number over 127 mm, but it may have something to do with some particular guns the Europeans commonly chamber for 45 Auto. __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle

January 12, 2023, 03:50 PM	#27
74A95 Senior Member Join Date: November 26, 2016 Posts: 1,570	There is some laddered 45 data here: https://www.shootingtimes.com/editor...-shooter/99418

January 13, 2023, 01:34 PM	#29
L. Boscoe Senior Member Join Date: October 30, 2021 Posts: 288	I have only asked Norma when they plan to offer it again. Time to get the chronolograph out.