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Sticking bolt

 
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  #1  
Old 02-28-2012, 02:36 PM
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Join Date: Mar 2009
Location: Soldotna, Alaska
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Sticking bolt

Ok so I was working on a load for my 300RUM and finally got a load that I really like. I was using new unfired brass and shot about 30 rounds of my set load at various ranges. All ranges I shot to out to 800 yds held a consistant .5 MOA. However settling on this load I reused the brass, full length resized it and now when i shoot the fired brass with that load just about every time i have a sticky bolt sometimes having to tap it open.
Iam shooting 94 grains retumbo and 200grn nosler acubon.
Nothing else with the brass looks like over pressure, there are no ejector marks, the primer pockets are still tight.

Am i overpressuring the gun or could it be something else?

Thanks, Tony
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  #2  
Old 02-28-2012, 03:06 PM
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Re: Sticking bolt

what resizing process are you using? are they harder to chamber also?
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Old 02-28-2012, 03:15 PM
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Re: Sticking bolt

I full length resize them and they chamber just fine no problems at all there
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Old 02-28-2012, 03:18 PM
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Re: Sticking bolt

what bullet and velocity are you getting? I tend to think your die may be set up incorrectly
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Old 02-28-2012, 03:24 PM
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Re: Sticking bolt

I am shooting a 200grn nosler acubon pushed with 93 grains of retumbo at 3144fps
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Old 02-28-2012, 03:33 PM
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Location: Tillamook, Oregon
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Re: Sticking bolt

I experience a similar situation with my RUM, but do not have a sticky bolt. When I use brand new unfired NC brass with my 89.5 gr. H1000 load with 210VLD's I run 3,050fps. I can go full length resize the same once fired brass, with the same powder charge and my velocity hops up to 3120fps. The pressure indicators on the case are more noticeable but no sticky bolt. Not exactly sure what causes this but my guess would be it's the difference between brass that fits looser in the chamber (new brass) and fired and resized brass that may have a closer fit. To correct for this, when I get a new batch of brass I run the initial firing about 1.5 grains higher and then once all new brass has been fired I drop back down to 89.5 grains.
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Old 02-28-2012, 05:36 PM
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Re: Sticking bolt

First thing I would check is case length they often grow on the first fire second, measure the shoulder set back from a fired case. The RUM I loaded for liked a 3 thou set back any less caused a little stick.
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