Armory Sponsor
Posted: 2/25/2016 3:05:55 PM EDT
| On the hunt for something that will give me the same crimp pressure instead of guessing. Came across this.... https://www.titanreloading.com/consistent-crimp . Are there any other tools out there for a consistent crimp that shows pressure applied or similar? I use the LFC die with good results but getting it in the exact position isn't as precise as I would like it to be. Suggestions? |
|
I have that tool and use it on my Rockchucker press along with the Lee FCD. It works as advertised! I worked up a load using 1x Win. brass, CCI 41 primers,H335 and Hornady55gr
FMJ-BT bullets for the best accuracy in my rifle with no crimp (settled on 25gr of H335, a load that shoots well in most rifles it seems). I loaded up 45 rounds. Then I used the Consistent Crimp along with the Lee FCD and started out crimping 5 rounds @ 5ft-lbs, 5 rounds @10ft-lbs, 5 rounds @ 15ft-lbs and so on in 5ft-lb increments,until I reached 40ft-lbs. Shot them all at separate targets @ 100 yds and picked the one grouped the tightest. That turned out to be 25ft-lbs in my rifle....3/4" , 5 shot group. Makes it easy and repeatable to reach the same crimp pressure on your ammo...I highly recommend it! |
|
Bottle neck type rounds.. I rely on neck tension to hold my bullets in place with bottle neck cartridges. If shooting a 458 or maybe a 375 H&H you may want a crimp. For a good crimp, the brass trim length should be all the exact same length. The only use i see for the tool in the video, is getting the correct handle pressure (25 lbs) when using the Lee neck sizing collet die. http://www.exteriorballistics.com/reloadbasics/gasgunreload.cfm |
| Its for AR10 308 short barrel. Recoil is enough that justifies a crimp. I use the K&M expander iron to get a more uniform bullet seating so bullet has very low tension going in. Then use the LFC die at almost 3/4 turn. Works great but know its slightly different on each batch. Appreciate the replies. |
|
It seems that you are going about things quite differently than what those who shoot those types of rifles for accuracy do.
There is no reason for you to have to try explaining why it is you want to crimp. That is your choice. My opinion is you should not rely on crimping to the degree that you need to get it perfect to maintain accuracy. I think you would be much better off with strong neck tension and a light crimp to keep things is check. I completely understand your question and use this very argument (inconsistency of crimp) when discussing accuracy and crimping. A crimp is a mechanically applied operation and the number of variables involved are too numerous to have any real accurate repeatability from case to case let alone from one loading session to another. I would use strong neck tension and a light to medium crimp with FCD. Mark the position of the FCD setting and maybe replace the Lee lock ring with one that actually locks. That way you at least have it set in the press the same every time. Motor |
|
Quoted: It seems that you are going about things quite differently than what those who shoot those types of rifles for accuracy do. There is no reason for you to have to try explaining why it is you want to crimp. That is your choice. My opinion is you should not rely on crimping to the degree that you need to get it perfect to maintain accuracy. I think you would be much better off with strong neck tension and a light crimp to keep things is check. I completely understand your question and use this very argument (inconsistency of crimp) when discussing accuracy and crimping. A crimp is a mechanically applied operation and the number of variables involved are too numerous to have any real accurate repeatability from case to case let alone from one loading session to another. I would use strong neck tension and a light to medium crimp with FED. Mark the position of the FCD setting and maybe replace the Lee lock ring with one that actually locks. That way you at least have it set in the press the same every time. Motor I agree with 99.9% of this. Only thing I think you may of left out was annealing the case necks to assure good even neck tension. Also check the diameter of you sizing ball in your sizing die. Good neck tension is achieved if sizing ball is .002 to .003 less then bullet diameter. So for .308 bullet a measurement of .305 to .306 is what you want. |
| One thing I have noticed when inserting the bullet was different tension. Some bullets needed strong pressure while others slide in easy. So I read some info on the expander and cost was ok and ordered it. My regular bullet seating looked like a shot gun blast @100 yards. After using the expander, tightened up considerably. Have checked the sizing ball and its good. I have made a mark on the LFC die so I know I am real close when setting it. Didn't think about a locking ring which is a good idea. The brass is once fired LC brass, not multiple fired. The place I get it from buys the rounds new in the box and I get some after they fire. |
Armory Sponsor