30-06 Match Ammo Crimp or ?
Gents,
I am looking to make some match loads up for my 1903A3 and 1903 and M1. Remington brass new, CCI #34 primers, 44gr Varget, topped by a Nosler Custom Competition 155gr bullet. Would any of you reloaders out there put a slight crimp on the round, I have been told by some more senior reloaders that this improves accuracy. Thanks, 03:sos::sos::sos:
Light Crimp via Lee's Factory die.
Quote:
Originally Posted by
presidents100
Crimping is used on heavy bullets to prevent movement. Heavy in a 06 is 200 and 220 grain bullets.
Match loads have no crimp. I have never used one.
I would suggest use of a M-die for match loads.
I had a similar question last year and did a test.
Basically I loaded up some dummy 178gr A-Max rounds in a properly sized case, measured the OAL then loaded them in my M1. I carefully extracted the round and measured the OAL again. In every case I had between 8 and 10 mils of travel of the bullet increasing the OAL. The 168gr A-Max round was slightly less.
I loaded up 20 rounds without a crimp and ran them through the chrono. then loaded up 20 rounds exactly the same but used the lightest possible crimp I could set using the lee factory crimp die.
Without the crimp my standard deviation in velocity was ~17fps. With the crimps it was ~12fps. With the crimped rounds I had no measurable increase in OAL when repeating the above test.
Left out of this post is if accuracy improved. Thats hard for me to say because my garand shoots better then I do. :) I am shooting about 1MOA with it at the moment using a very lightly crimped round.
For me the idea of bullet movement bothers me. Whats the point of working up a load with a set distance from the lands when it moves upon chambering. Worse yet, what happens when one is unusually loose and it stops on the lands?
Just my take on it.