Any drawbacks for not seating to the Cannelure

Peppysan

Peppysan

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What are the consequences of seating this style of bullet back of the cannelure crimp area?
The image illustrates where the bullet contacts the lands of the barrel. The cannelure is approximately .045” wide and is .080” further ahead.
So therefore seating it deeper would make the “jump” to the lands .080” or more. This is a Hornady 130g bullet in a Winchester .270.

Opinions, or theories on the how this would affect anything?
Second question, if you go that deep crimp it or not?

BULLETSEAT270-2.jpg
 

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It's not an issue, none of the bullets that I currently use have a cannelure, and I don't crimp any rifle ammunition, unless it goes in a tubular magazine.
 
Some bullet like to be jumped. Loading long was a benchrest method that now is applied to all sauce - good or bad. Loading long reduce pressure and most likely velocity, unless you add more powder than data show as a max load.

The .270 is a very well know cartridge with ton of reloading data that produce accurate ammunition.

Most competition gun do not allow long loading cause of mag lenght. Loading long is far for a sure thing that it make your gun shoot better.

The bullet you are using in a hunting bullet. If you develop your load with it loaded to max SAMI oal, it will shoot as good if not better, than just loaded long.

No need to crimp, but if you do - in cannelure - sling roll or a Lee factory crimp die work very well. If you don’t load in the cannelure- a taper crimp can be applied. Neck tension do it without crimp of any kind.
 
You dont want to be tight to the lands for a hunting round. Give yourself 30 thou clearance, or more if your mag needs it. Why dont you load a few rounds to the cannelure and compare? Thats the benefit of reloading...
I've never found the need to crimp in a stacked magazine fed rifle.
 
cosmic said:
You dont want to be tight to the lands for a hunting round. Give yourself 30 thou clearance, or more if your mag needs it. Why dont you load a few rounds to the cannelure and compare? Thats the benefit of reloading...
I've never found the need to crimp in a stacked magazine fed rifle.
Click to expand...

Well thanks to all for the concurring opinions. It's is basically what I thought would be the outcome. w:h:
Of course reading a lot on loading close to the lands and all, I thought I would measure were they were relative to where I HAD BEEN loading this round.
My past batch of .270 with this bullet I had loaded and crimped it in the cannelure location. This, (as it turns out) gave me about a .090" stand off from the lands.
But I wasn't disappointed in my groups, as they came in at just a little over 1/2MOA at 100yrds. (.577") I figure that's pretty good.
I think I may put a few together with varying stand offs and see were they group. At least I have a good starting point. :sniper:
 
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