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Seating Depth & Magazine Capacity

 
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  #1  
Old 05-08-2014, 02:06 PM
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Seating Depth & Magazine Capacity

Ok, I did a dumb thing today. I am working up a load for 155.5 Berger Fullbores. I loaded the bullets to .015" off the lands but found when I got to the range, I had to feed the cartridges by hand because they were greater than the magazine length.

I found a good node, came back, measured the mag. length and found that in order to magazine feed, I need a jump of at least .066"

Is all of my data wasted? I assume that I can't just load to .066" jump without a pressure spike. Should I start over or should I back down progressively from .015" jump until I'm in the Berger recommended seating test sequence (and below mag length):

.010 off the lands
.050 off the lands
.090 off the lands
.130 off the lands
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Old 05-08-2014, 03:36 PM
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Re: Seating Depth & Magazine Capacity

Shorter COAL raises pressure in pistol cartridges not rifle cartridges. Jamming the bullet into the rifling raised pressure in rifles. Most of the slow burning powder charges are already compressed so a small amount more does not change much.

To keep the mag from battering the bullet nose the COAL must be shorter than the Mag OAL. How much shorter is dependent on the gun itself. Your jump is going to be more than 0.066".

KB
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Old 05-08-2014, 03:41 PM
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Re: Seating Depth & Magazine Capacity

What kind of rifle is it, and what caliber?
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Old 05-08-2014, 06:12 PM
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Re: Seating Depth & Magazine Capacity

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Originally Posted by MudRunner2005 View Post
What kind of rifle is it, and what caliber?
GA Precision. 308.
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Old 05-08-2014, 06:17 PM
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Re: Seating Depth & Magazine Capacity

Quote:
Originally Posted by Kennibear View Post
Shorter COAL raises pressure in pistol cartridges not rifle cartridges. Jamming the bullet into the rifling raised pressure in rifles. Most of the slow burning powder charges are already compressed so a small amount more does not change much.

To keep the mag from battering the bullet nose the COAL must be shorter than the Mag OAL. How much shorter is dependent on the gun itself. Your jump is going to be more than 0.066".

KB
So it's ok to start at .066" and work shorter?
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  #6  
Old 05-08-2014, 06:59 PM
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Re: Seating Depth & Magazine Capacity

If it's a .308 Win, it should shoot fine with the bullets pressed in as far as SAAMI spec, which is an OAL of 2.810". I'd try them like that to see how they shoot. Then work your way further out till you find a good OAL that is still within mag length.

If the rifle is based off a Rem 700 style footprint, you could always send it back to them and have them mill out the reciever and install a Wyatt's Outdoors extended mag box and follower, which will allow for longer OAL cartridges.
__________________
"I'm just a peckerwood who lives in the hills with too many guns..." - Bob Lee Swagger

"Give me a minute...I'm good. Give me an hour...I'm great. Give me 6 months...And I'm unbeatable." - Col. Hannibal Smith

Ignore everything I say, because I have a reading comprehension and memory problem...

Quote:
Originally Posted by WildRose View Post
The 284 is to the STW what a tricycle is to a Ninja.
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  #7  
Old 05-08-2014, 07:22 PM
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Join Date: Jun 2013
Posts: 194
Re: Seating Depth & Magazine Capacity

Quote:
Originally Posted by MudRunner2005 View Post
If it's a .308 Win, it should shoot fine with the bullets pressed in as far as SAAMI spec, which is an OAL of 2.810". I'd try them like that to see how they shoot. Then work your way further out till you find a good OAL that is still within mag length.

If the rifle is based off a Rem 700 style footprint, you could always send it back to them and have them mill out the reciever and install a Wyatt's Outdoors extended mag box and follower, which will allow for longer OAL cartridges.
Just to be sure, can I go right to SAAMI with the powder charge I'm using? Why the difference between pistol and rifle cartridges?
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