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Posted: 9/2/2010 11:54:38 AM EDT
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Ok, I'm crimping at the cannelure using Hornady no. 2267 (55gr. fmj)
and I'm getting ready to switch over to 55gr FMJ Lake City pulled. I see that the crimp is slightly lower on the LC than on the Hornady. My trim varies from to 1.750 to 1.753 (using a Giraud). Should I adjust the bullet depth and crimp at the cannelure or just seat as usual and crimp above the cannelure? OAL is that same using Hornady or LC. |
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The cannelure is wide enough to seat the bullet a bit lower or higher,,,but its not much. The different OAL is going to effect your accuracy, or maybe it will not–– you will have to shoot the rounds in your rifle to tell if there is a difference. The OAL is a good gauge for how far out you can seat the bullet before you start getting troubles in the rounds feeding in your magazines.
I recently bought a cheap pile of new bullets from a source, only to find half had the cannalures slightly off. So I had to sort them into two piles, and adjusted my seating depth to fit each. When it came time to shoot, neither one was less accurate, both types shot well. It was just a pain in the butt to sort 1000 bullets into those two piles. As long as you do not seat the bullet too far, compressing the powder, you will most likely have good results with your rounds by seating them to the cannalure. 
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| The profiles of the Hornady 55 fmj and LC bullets are different. Hornady's ogive and tip shape are different. Hornady's overall seated length is 2.200-2.230" but the LC pulls will probably need an overall length of 2.250" and that should put the cannelure where it's at a position to crimp. Try taking one of your loaded Hornady 55 fmj rounds in your seating die and adjust the seater punch down to touch the bullet. Leave it at that position and seat one of your LC bullets and the oal probably will be around 2.250". The LC's have a sharply pointed tip and oal will be longer. I think they must place the cannelure on the bullet at a distance from the tip and not the base of the bullet. |
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I've made a few dummies adjusting the seat die..
First using Hornady. 2.225 with a crimp at the cannelure. Second using pulled LC 2.246 with a crimp at the cannelure. Third using the same LC 2.250 with a crimp at the cannelure. I've tested the rounds in a magazine and no issues there. So I'm good to go? |
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Quoted:
I've made a few dummies adjusting the seat die.. First using Hornady. 2.225 with a crimp at the cannelure. Second using pulled LC 2.246 with a crimp at the cannelure. Third using the same LC 2.250 with a crimp at the cannelure. I've tested the rounds in a magazine and no issues there. So I'm good to go? That pretty much agrees with my observations. My "almost" M193 using 1x LC and Hornady w/c is usually 2.220 to 2.222 COAL with crimp in the cannelure. My fresh 0x LC XM193 is 2.246 to 2.250. It all feeds through my "good" mags and autoloader ARs OK. |
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Cannelures....crimp 'em if you got 'em!
It helps prevent set forwards and set backs like these below. I know some of the reloaders on here are careful to sample their output and determine that their "neck tension" is sufficient to meet the mil spec for M193 and M855 bullet retention and do a much better job than Winchester controlling that parameter. But, for those of us that are more anal retentive or OCD about the subject, we like to crimp our TAP home defense stuff. So do BH and Hdy and the Military by the way. 
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