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#6476049 - 10/01/16 01:51 PM compressed loads
colt45 Online   content
THF Trophy Hunter

Registered: 08/19/06
Posts: 5645
Loc: bastrop county
is there a negative to loading compressed loads for ar's?
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#6476059 - 10/01/16 01:55 PM Re: compressed loads [Re: colt45]
Txhillbilly Offline
Bird Dog

Registered: 08/14/15
Posts: 483
Loc: Johnson County
Depends if you have a long enough barrel to get a full burn. If not, you're just wasting powder.

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#6476096 - 10/01/16 02:41 PM Re: compressed loads [Re: colt45]
Creedmoor Offline
Pro Tracker

Registered: 09/12/16
Posts: 1086
What powder and bullet?

There was in the past the thought that a compressed load would burn more efficiently than a load that didn't fully fill the case. With the powders that we have available to us now that isn't necessarily true. And it usually has nothing to do with barrel length. It depends on the application.

As a general rule, a compressed load isn't dangerous IF it is inside a safe pressure curve. And that's a BIG "IF".

Once again ...... is this something that you are going to load / have loaded? Or are you just considering it?
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#6476169 - 10/01/16 04:17 PM Re: compressed loads [Re: colt45]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6444
Loc: Wise Co.
One advantage of a compressed load for an AR or any semi-auto is that you won't have bullets pushed deeper into the case during feeding, which can raise pressure. There is no downside to a compressed load---unless you're trying to pack so much of a slow burning powder under the bullet that the bullet creeps back out of the neck. That can, and DOES happen.
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Originally Posted By: Cleric
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#6476177 - 10/01/16 04:26 PM Re: compressed loads [Re: colt45]
Creedmoor Offline
Pro Tracker

Registered: 09/12/16
Posts: 1086
Depending on the amount of compression (over 103%) it can and does cause the bullet to back out a bit as you just said. I loaded compressed loads for a 308 that had to be crimped to keep the bullets from backing out. Sometimes, it's best to avoid it entirely.

There are usually other powders that will give the same results without all of the problems. That's why I asked him what powder / bullet combination he was looking at using. wink


Edited by Creedmoor (10/01/16 04:29 PM)
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#6477100 - 10/02/16 12:37 PM Re: compressed loads [Re: colt45]
parkj5 Offline
Woodsman

Registered: 09/05/04
Posts: 119
Loc: Bentley La..
With the new selection of today's short cut powders I don't think its necessary to compress loads like you did in the old days. Not saying that you shouldn't do it but like stated above anything over 103% u run the risk of bullet moving in the case neck.
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#6477115 - 10/02/16 12:47 PM Re: compressed loads [Re: colt45]
Big Daddy K Online   content
Veteran Tracker

Registered: 09/01/04
Posts: 2764
Powder and load?
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#6477295 - 10/02/16 03:56 PM Re: compressed loads [Re: colt45]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6444
Loc: Wise Co.
Sometimes the best load you can cook up will necessitate a compressed load. One example would be the .35 Whelen with 225-grain Accubonds using Re15.
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Originally Posted By: Cleric
God I am hating caliber threads more and more

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#6479302 - 10/03/16 07:08 PM Re: compressed loads [Re: RiverRider]
jeh7mmmag Online   happy
gramps

Registered: 11/01/04
Posts: 12666
Loc: Colleyville, DFW, TX
Originally Posted By: RiverRider
One advantage of a compressed load for an AR or any semi-auto is that you won't have bullets pushed deeper into the case during feeding, which can raise pressure. There is no downside to a compressed load---unless you're trying to pack so much of a slow burning powder under the bullet that the bullet creeps back out of the neck. That can, and DOES happen.
up

Nothing is wrong with a proper compressed load-It has the advantage of powder not shifting around because case is completely full. But watch for the creepage as stated above.

If you do go with a compressed load try this. Hold a engraver, handheld electric massage or electric shaver to the cartridge or to the cartridge loading tray. The vibration will make the powder settle down in the case. Be careful you will kick some powder out if not careful. Works better than a drop tube.
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