OzFclass

Is anyone crimping their .308’s

We have a champion fullbore shooter who has recently started to crimp his loads and he has now formed a superior view on their overall accuracy.

I do believe that some issues are mentally based, if we get on the mound with the upmost trust in our equipment and ammo we shoot well. If we have any doubts we shoot badly.

For example, if I use NRAA Factory 155gn (as good as they are) I have this underlying issue in the back of my mind that they are not my trusted handloads and as such could have a bearing on my performance.

What are your thoughts?

tony

have you noticed any difference between shells when bullet seating (some seat with less resistance than others)

bullet crimping would remove this small inconsistency between rounds and therefore keep pressure variations to a minimum and therefore increase accuracy

that’s my understanding of it anyway (maybe I’m wrong)

Sure, some are tight while some offer almost no resistance.

Through the chrony my max deviation is normally never more than 20fps

that was me forgot to log-in

eventhough you only get 20fps deviation it might still be enough and certainly at the longer ranges

other that that you could send it to Myth Busters see what they come yp with

Now, for the academics out there …

Does crimping change the BC to a higher level?

The displaced lead has to go somewhere and while the diameter is a constant it can only go the nose. I would imagine it does elevate the BC but it may be immeasurable in regard to any advantage.

Also additional drag caused by the new canilure ? or should I re direct this post to the MIT or other University

[quote="Tony Q"]Now, for the academics out there …

Does crimping change the BC to a higher level?

The displaced lead has to go somewhere and while the diameter is a constant it can only go the nose. I would imagine it does elevate the BC but it may be immeasurable in regard to any advantage.

Also additional drag caused by the new canilure ? or should I re direct this post to the MIT or other University [/quote]

good question hope someone can answer it cuase i would like to know to

TQ what are U waffling on about?
I don’t think this would have any effect on BC the bullet is rammed down a barrel at lightning speed rifling gouging into the bearing surface what is the diff of a few little scratches on the side
BC a fuggy figure at best is determined by bullet shape and metplate
I think the crimping is to do with a positive neck tension giving a uniform pressure curve
RB
If U want some real tech answers go to

http://www.benchrest.com/forums/

http://www.long-range.com/

lol Richard

I know the question was right out there in regard to reallity. The question was for those who come from another planet ... could have them thinking for weeks.

Good 1 M8ty