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Extra powder for longer OAL

 
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  #1  
Old 03-15-2012, 02:22 PM
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Join Date: Feb 2011
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Extra powder for longer OAL

I have a .223 that im loading up some 62gr TSX bullets for.

Im using Varget, barnes info says OAL 2.25." If looking for accuracy, should start around .03-.07 off the lands.

On my rifle .05 off lands is @ 2.36". Soooo, im seating out aprox an extra .1".

How much more powder do I use to make up this extra capacity. Some one told me 2-3 extra grains.

I understand always start low, but im looking for a decent starting point rather than starting 2-3 grains too low.

TKS
JPB
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  #2  
Old 03-15-2012, 02:34 PM
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Join Date: Jan 2012
Location: Hot Springs, South Dakota
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Re: Extra powder for longer OAL

Quote:
Originally Posted by jpbaker View Post
I have a .223 that im loading up some 62gr TSX bullets for.

Im using Varget, barnes info says OAL 2.25." If looking for accuracy, should start around .03-.07 off the lands.

On my rifle .05 off lands is @ 2.36". Soooo, im seating out aprox an extra .1".

How much more powder do I use to make up this extra capacity. Some one told me 2-3 extra grains.

I understand always start low, but im looking for a decent starting point rather than starting 2-3 grains too low.

TKS
JPB
I understand always start low, follow by a "but"? Evidentially you don't.
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Old 03-15-2012, 02:56 PM
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Re: Extra powder for longer OAL

Quote:
Originally Posted by JackiinSD View Post
I understand always start low, follow by a "but"? Evidentially you don't.

I do start low, sorry if I wasent to clear.

Data changes when you change COAL.... why would I start at 23.5gr "book min" when I should be starting at 26gr. because of the extra COAL. (by the way yes I have some started at "book min" and worked up. These are loaded at an OAL of 2.25".)

That I what im looking for. For instance, if I did this with a 300WM and loaded out to the lands and did not exceed "book max" loads, my 300wm would be more like a 30-06 because of decreased pressures, due to the fact im out an extra .2" with my COAL


TKS
JPB

Last edited by jpbaker; 03-15-2012 at 04:00 PM.
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  #4  
Old 03-15-2012, 07:44 PM
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Join Date: Jan 2012
Location: Hot Springs, South Dakota
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Re: Extra powder for longer OAL

Quote:
Originally Posted by jpbaker View Post
I do start low, sorry if I wasent to clear.

Data changes when you change COAL.... why would I start at 23.5gr "book min" when I should be starting at 26gr. because of the extra COAL. (by the way yes I have some started at "book min" and worked up. These are loaded at an OAL of 2.25".)

That I what im looking for. For instance, if I did this with a 300WM and loaded out to the lands and did not exceed "book max" loads, my 300wm would be more like a 30-06 because of decreased pressures, due to the fact im out an extra .2" with my COAL


TKS
JPB
I hope someone else chimes in. There is so much wrong with your statements that I don't want to seem like a jerk trying to correct them all.
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  #5  
Old 03-15-2012, 09:36 PM
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Join Date: Feb 2011
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Re: Extra powder for longer OAL

Ok, now im severly confused.

I found that post that I got this info from... It was regarding a 300wm load.

There is the post:

Re: .300wm 165gr SST LOAD
You have to have an old manual to get the truth, to many lawyers involved in the newer ones, if your looking for accuracy then your probably going to start loading at a longer oal to get you closer to the lands, rule of thumb with bt bullets is for every .100" further your out you will need 2.7-3.1grns more powder, obviously the lighter bullets get the 3.1 example take. What you want to load a 165 with 75.5grns at 3.34 if you load it to 3.44" that same load would be 78.6grns, this is to maintain the charge density. Iff accuracy is what you want use Imr4350 starting around 69grns and cci br2 or fed210m primers and not magnum primers, this will likely give you the best results in all aspects.

__________________________________________________ _________

Someone please unconfuse me,

TKS
JPB
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  #6  
Old 03-15-2012, 09:59 PM
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Join Date: Jan 2012
Location: Hot Springs, South Dakota
Posts: 504
Re: Extra powder for longer OAL

To correct one thing you posted earlier: The Importance of Bullet Seating Depth | The Reloading Press

Straight from Hornady 4th Edition page 15.

"When the bullet is seated to tough the rifling, it does not move when the pressure is low. It takes greatly INCREASED pressure to force it into the rifling. As the rapidly expanding gases now find less room than they should have at this time in their burning, the pressure rise under these conditions is both rapid and excessive."

So, going over the "book max" when touching the lands is an extremely bad idea.

While creating more room for powder sounds great, and many guns shoot best when loaded close to the lands, touching the lands or even jammed. It will depend on the combination of components involved to insure that putting that extra powder in does not create too much pressure.

Loading the bullet to touch the lands or jammed, it is highly recommend that you never use a max listed load.

Comparing any of load data from a 300 WM to a 223 just won't work.

If you correctly worked up a load for 2.25" OAL do the same for one with a 2.36" OAL. Just remember that if you are touching or jammed into the lands you must lower your max load and watch for pressure signs are you go through the process.
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  #7  
Old 03-15-2012, 11:06 PM
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Join Date: May 2010
Location: Central Ohio
Posts: 253
Re: Extra powder for longer OAL

I am in agreement with with JackinSD, the closer to the lands you seat a bullet the higher the pressure with a given powder charge. I have experimented with this working up loads.

To prove this (you need a chronograph) using a given powder charge (same amount of powder thru whole process) load up 3 rds. at a oal of 2.25 then load 3 rds. at 2.30 continue this pattern till bullets are almost touching lands. You will find as the bullets get closer to the lands velocity will increase, which means your pressure is increasing.
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