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seating consistency problem

 
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  #1  
Old 09-27-2009, 05:11 PM
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seating consistency problem

Trying to reload for my 300winn mag today. New remington brass and barnes 180grain ttsx bullets. Using H1000 - started with 77 grains max load. loaded 3 rounds - bullets would not seat at a consistent depth. First time I seated bullet it would be .04 over where I wanted it - measuring off ogive - I would put the round back in and cycle it again now it would be .03 over and so on. I checked my set up several times - everything was tight and where it was supposed to be. I then loaded 3 at 76, 75 and 74 grains - the same thing happened every time. I am using an RCBS Rock Chucker with RCBS dies. I have never loaded tipped bullets before. I can't believe this is normal but maybe it is. I reloaded some rounds for my 30-06 using sierra game kings with no problem.
I do have a box of factory ammo loaded with the ttsx bullet that also showed variation

HELP

Thanks

Last edited by MN Hunter; 09-27-2009 at 05:25 PM.
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  #2  
Old 09-27-2009, 05:41 PM
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Re: seating consistency problem

With the max load are you compressing powder? Those 180 TTSX's are long.

I have very good dies and competition seaters yet sometimes I get +/- .003 between loads. Never effective my groups.
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Last edited by wadevb1; 09-27-2009 at 07:30 PM.
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Old 09-27-2009, 06:11 PM
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Re: seating consistency problem

The barnes book lists 72min load and 77 max for h1000. The first load I tried was the 77 grain load - I could hear the powder compressing as I cycled the load. I thought that the amount of powder could be the problem. I then went to the 74grain load - again I could hear the powder compressing. Same variation is seating depth. I have never loaded where the load has been compressed. It sounds like what I am experiencing is the nature of the beast??? Currently I am seating for the max coal of 3.40. I do have a wyatts box - my smith suggested it after he measured the chamber - don't remember that number off the top of my head - the gun is a remington sendero - sounds like it might help to seat the bullets out a little farther?
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Old 09-27-2009, 07:28 PM
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Re: seating consistency problem

Nothing like starting out with a max load

I suspected the powder was your problem and you can try seating further but how much is dependant upon how much jump you will want. I have had good results with the 180TTSX jumping .030. You could try a drop to to compress your powder.

Many guys like H1000. I tried it with so-so results. I switched to Reloader 22 and never considered anything else.
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Old 09-27-2009, 07:45 PM
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Re: seating consistency problem

Not sure why I started with 77 - seemed like the thing to do. Normally I start mid range and load a couple close to it. Have not fired them yet. I"ll start with the 74 grain and work my way up. Just surprised that I am still compressing the load at 74grains. There is no notation in the manual that this is a compressed load.
Thanks for the input
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Old 09-27-2009, 10:01 PM
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Re: seating consistency problem

It's really, really, really a good a good idea NOT to start with a max load. Yesterday I started load deveolopment for a 300 RUM. I'm using 3 bullets and 2 powders. Hodgedon lists 100.5 gr of Retumbo as max for a 180 bullet (SPR SPBT). I started with 97.5 with a 180 E-Tip. Then stepped up a half gr to 98 gr - stiff bolt. Dont like to think what would have happened If i tried 100.5 gr right off the bat. Next I moved to H1000 with the 180 E-Tip. Nosler lists 92 as starting and 96 as max. Hodgdon also list 96 as max. I started with 93.5 and then step up a half gr again to 94 - stiff bolt. I was a warm day at 80*.

There are good reasons not to start at max.

-MR
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  #7  
Old 09-28-2009, 02:32 AM
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Re: seating consistency problem

I know what your problem is straight up!
Your neck tension is insufficient!
What's happening is, when you seat the bullet, the seater plug is grabbing/sticking on the bullet and pulling it partially out of the case as it's being withdrawn from the die. The compressed powder isn't helping either, but if you increase the neck tension, the problem will go away!
77gr's of H1000 is not an overly compressed charge, but it will still put a bit of pressure on the base of the bullet.

You can also 'swirl' the charge into the cases using the pan from your scale and a powder funnel, this will give more room for the bullet in the case, and will most likely improve accuracy due to tighter packing scheme of the powder.

I have this problem with my 300WM when the brass is freshly annealed, I use 2 different expander plug sizes, 1 .002" under bullet dia. for normal cases and 1 .004" under bullet dia. for newly annealed cases.
I also use a bushing die with different bushings for the same reasons above. Depends on which rifle I'm loading for, hunting or F-Class.

Last edited by MagnumManiac; 09-28-2009 at 02:36 AM.
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