[Bucky]

G day Guy's
I started using Lee Crimp Dies on some of my rifles about 5 months ago.

I use RCBS Precision Mic's to measure my loaded 270 and .222, and have ordered them for a 243 ( a mates !) and 6.5x55 Sweedish Mauser.
Those Mic's are showing me that that the loaded bullet is growing up to 3.5 thousands of an inch, if I heavy/meduim crimp.

Light crimping seems to be a waste of time for me, as I would rather continue with correct, and consistent, neck tension.

Am I doing anything wrong, or do I have to set the ogive down 3-3.5thou, to compensate ?

Cheers
Bucky

 

[SWO1]

If your guns are "bolt", which I think they are .... Neck sizing is Mo better. The only rounds I crimp are revolver ammo. Crimping rolls the neck in, as I know you know, which in turn bites into the bullet. If you do that the displaced material has to go somewhere. I tried crimping the 30-06 and got varying results across the same load.

 

[Bucky]

If your guns are "bolt", which I think they are .... Neck sizing is Mo better. The only rounds I crimp are revolver ammo. Crimping rolls the neck in, as I know you know, which in turn bites into the bullet. If you do that the displaced material has to go somewhere. I tried crimping the 30-06 and got varying results across the same load.

CHeers
SWO1

 

[hombre243]

G day Guy's
I started using Lee Crimp Dies on some of my rifles about 5 months ago.

I use RCBS Precision Mic's to measure my loaded 270 and .222, and have ordered them for a 243 ( a mates !) and 6.5x55 Sweedish Mauser.
Those Mic's are showing me that that the loaded bullet is growing up to 3.5 thousands of an inch, if I heavy/meduim crimp.

Light crimping seems to be a waste of time for me, as I would rather continue with correct, and consistent, neck tension.

Am I doing anything wrong, or do I have to set the ogive down 3-3.5thou, to compensate ?

Cheers
Bucky

Bucky, if your bullets are stretching because of the crimp and they are growing up to .0035" in one direction, are they also growing in the other direction? If they are will that increase pressure? If you have to seat the bullet deeper that will also increase pressure. Sounds like kind of a vicious circle.

The only thing you can do is lower the powder charge a skosh. (over here that means "just a tiny bit."

 

[Bucky]

Look what I did yesterday morning.
Now I don't care if that is what heavy crimping does

The 130 #2 foto is from the Remington 700 CDL in .270...., the only time i hate heartbeats !

 

[hombre243]

Look what I did yesterday morning.
Now I don't care if that is what heavy crimping does

The 130 #2 foto is from the Remington 700 CDL in .270...., the only time i hate heartbeats !

You're standing too close...shoot the one in the middle...are those black marks powder burns? Good shootin bubba. What was the distance?

 

[Bucky]

You're standing too close...shoot the one in the middle...are those black marks powder burns? Good shootin bubba. What was the distance?

Bite BUM
Cheeky little monkey

 

[SWO1]

What ever your load and crimp, thats mighty fine shootin Bucky. I loaded some .270 for my brother-in-law last season. He shoots a remington pump .270. First go around we had it under an inch at 100. If you dont mind tellin me what that load is .. I would like to try some and see if his will shoot half as good as you. I doubt the pump will against your bolt gun. They have to be crimped for a pump anyway. I loaded 150 gr Hornady in front of RL-7 and remington brass with Federal BR primers. He was happy with two shots, two deer but he would be real happy with better accuracy.

 

[Bucky]

SWO1
Must apologize for the delayed response,
I have been away for a couple of weeks, caravaning at the edge if the Victorian High Country, and trying to set up this years hunting, and by the way have had some good success......another story there.
Back to your question !

My recipe is as follows

Hornady 130gr SST's set .005" off lands (I use RCBS precision mic so don't ask me for the AOL, as it don't happen anytime)
Powder......54.3gr AR2209 (Hodgson Equivallent H414/ H4350)
Winchester brass shoulder bumped down .002", after "fire-formed".
Federal 210 large primer.
Heavy crimp (lee factory crimp)

Hope it works for you, Mate !...,,,, as this has taken me 2 years of frigging around to get it to this consistency.

Cheers
Bucky

 

[SWO1]

Thanks for the info on the .270 loads Bucky. I will for sure give it a try. Have to mess around with the AOL as its usually different for each rifle anyway.

Good luck with your hunt ..... be sure to fill us in.

Frank

 

[Bucky]

Thanks for the info on the .270 loads Bucky. I will for sure give it a try. Have to mess around with the AOL as its usually different for each rifle anyway.

Good luck with your hunt ..... be sure to fill us in.

Frank

SWO1
I will make up a blank, and measure the AOL.....Just for you, but give me a day or so, as I am very very busy this week

Cheers
Bucky

 

[Bucky]

Thanks for the info on the .270 loads Bucky. I will for sure give it a try. Have to mess around with the AOL as its usually different for each rifle anyway.

Good luck with your hunt ..... be sure to fill us in.

Frank

Frank
As promised
The .270 AOL is 3.360". Now that's for the Hornady 130gr SST's
The crimp is heavy, and is way under the canular

 

[SWO1]

thanks Bucky for the AOL. I will give it a try.

 

[Bucky]

Thanks for the info on the .270 loads Bucky. I will for sure give it a try. Have to mess around with the AOL as its usually different for each rifle anyway.

Good luck with your hunt ..... be sure to fill us in.

Frank

Frank
Pls remember that my .270 is a Remington 700, with it's "long throat".
Could try the old trick with the cleaning rod first, and set the AOL just 5-10 thou off the lands .

My suggestion is to get an RCBS Precision Mic, forget about measuring anything in inches, millimeters, and all that.
What you only need to do, is use the markings on the Mic as a reference point, and load back to those points, every time.

[ame]https://www.youtube.com/watch?v=lAiSmCk-5YQ[/ame]
Also this video is very good
[ame]https://www.youtube.com/watch?v=PiGzpC55KBU[/ame]

I will end up with 7 or 8 of those Mic's in the next 5 years, as they are just brilliant, as they allow me bump the case shoulder down .0015" -002" every time, (the headspace) rather than .010"- .012" which full length sizing does.
Lee dies give me that flexability, so I am slowly changing over to those as well.

Apart from that
Do this method, as it's what I was using before i got onto the Precisioon Mics.
[ame]https://www.youtube.com/watch?v=EnV63xVFVO0[/ame]

The other thing i did was to look at the neck tension for any of my dies.
I measure the expander ball with all new dies, and only want .002 under the caliber of the bullet I am reloading. That gives me .001" neck tension all around the projectile.

Hope this makes sense ?

Cheers
Bucky