Crimp or No crimp.??

[foggy11]

Hi all...

 

To Crimp or not to crimp , that is the question ??

 

 

Does anyone, or all, or none, crimp there .243 ammo or any other ammo come to that?

 

I can see the merit in the theory but just wonder what everyone else think...

 

Cheers....

 

Nik..

[henry d]

No

[foggy11]

Well that's short and sweet..

 

But have you got a reason, or is that just the way you do it.

[Redgum]

I crimp, have tested with and without ,more accurate with 100grain and 85grain sierras crimped. My theory is,as my remmie shoots best well back from the lands crimping helps uniform the pressure. A word of warning with crimping though,don't over do it as its dead easy to deform the bullet.

I set my lee factory crimp up as per the lee website and it marked the bullets leaving quite an indent so I backed it off, tested with a deprimed shell, crimping then pulling the round out in the vise.

There are a few good vids on u tube.

Edited October 28, 2010 by Redgum

[Hornet 6]

I'm crimping for a .22 hornet, for two reasons.

The weak hornet brass makes getting a consistent neck tension hard, not helped by loading short to suit the magazine.

And getting a flat base bullet square in the case without leaving a ridge part way round the case is much easier if you flair the case mouth, which makes crimping a necessity, if you want round to feed properly.

I don't do it on my .223 as I use boat tail bullets and the case is strong enough to give a decent neck tension.

 

Neil.

[henry d]

Well that's short and sweet..

 

But have you got a reason, or is that just the way you do it.

 

Ah you want reasons !

 

I reload .222 & 6.5 and both have good brass and shoot well 20thou off the lands, chamber well and have enough bullet in the case to cause no concerns that rough handling in the field may damage them.

[garyb]

No crimp in 243 or my 308

 

Both shoot tiny groups so I don't bother!

[hawkeye]

I'm crimping for a .22 hornet, for two reasons.

The weak hornet brass makes getting a consistent neck tension hard, not helped by loading short to suit the magazine.

And getting a flat base bullet square in the case without leaving a ridge part way round the case is much easier if you flair the case mouth, which makes crimping a necessity, if you want round to feed properly.

I don't do it on my .223 as I use boat tail bullets and the case is strong enough to give a decent neck tension.

 

Neil.

for the same reasons..

[njc110381]

I'm crimping for a .22 hornet, for two reasons.

The weak hornet brass makes getting a consistent neck tension hard, not helped by loading short to suit the magazine.

And getting a flat base bullet square in the case without leaving a ridge part way round the case is much easier if you flair the case mouth, which makes crimping a necessity, if you want round to feed properly.

I don't do it on my .223 as I use boat tail bullets and the case is strong enough to give a decent neck tension.

 

Neil.

 

 

for the same reasons..

 

 

And me, but just for the sake of the neck tension really.

[Harnser]

I allways crimp . One of the biggest anomalies in re-loading is neck tension . A crimp will insure the same tension . You can crimp any bullet ,with out a cannular . Any indentention in the bullet from crimping will dissapear by the time the bullet has gone through the barrel and came out the cther end . I find crimped bullets to be more accurate .

 

Harnser .

[Redgum]

I allways crimp . One of the biggest anomalies in re-loading is neck tension . A crimp will insure the same tension . You can crimp any bullet ,with out a cannular . Any indentention in the bullet from crimping will dissapear by the time the bullet has gone through the barrel and came out the cther end . I find crimped bullets to be more accurate .

 

Harnser .

Thats interesting, I pulled a couple of rnds apart because I thought the crimp tight and the heads were indented. Have the die set so I can add a light crimp at the same tension each time. Wish I'd put the over crimped rnds out to paper as a test.

[Harnser]

Thats interesting, I pulled a couple of rnds apart because I thought the crimp tight and the heads were indented. Have the die set so I can add a light crimp at the same tension each time. Wish I'd put the over crimped rnds out to paper as a test.

Ammo used in a sporting rifle can be cycled through the mag and the chamber a number of times before being shot . A decent crimp will insure the bullet remains tight in the case . Also a crimp will help to create a better burn of the powder by holding up the bullet for a milli second or two .

 

Harnser .

[foggy11]

Thank you all for your input...

 

I think it clears up a few things in my mind.

 

It's pretty much the conclusions i had come to, but just wanted to be sure I wasn't on my own.

 

Many thanks to all..

 

Cheers.

 

Nik.