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Help identify preasure signs ?

 
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  #1  
Old 01-30-2010, 03:36 PM
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Help identify preasure signs ?

I have been handloading for about 3 years and have ALOT of fun and some sucess with my 22-250 and .243...in the last 6 months I have been loading for my 300 RUM. Its a lilja bbl 700 rem. I have played with rl-25 and retumbo and the 185 berger vld. cci 250 primers or fed 215's. neck sized rem brass at 3.68 coal. still fits mag. I have a brake on it and it still feels like some one punching me in the face when i shoot it. I can get past that recoil and im sqeezing of good shots, i guess... its shooting .7 " at 200. Im hitting fair at 850 yds.. My little experience with big charges has me scared to increase. Im running 94 grains of retumbo and the max listed by bereger is 96 gr. I know what to look for but ive never seen any preasure signs to know what it looks like. ???? (you get where im going yet ?) I know to look for primer flow and ejector marks but don't know what those look like... It's simply a confidence issue with my experience level. My MV with the 185 vld is 3060 to 3073 with the 94 gr. charge. Thats not letting me get to 1000 yd. with one rotation on my scope. 70 1/3 " clicks is well into the second rotation at a grand. I was told to try to get my MV to up around 3200 fps. this would also let me use less wind hold. any advice would be appreciated.. Thanx
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Old 01-30-2010, 07:59 PM
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Re: Help identify preasure signs ?

My number one pressure indicator is how well the brass holds up, specifically the primer pockets, but that doesn't help much at the bench when you are working up. I keep an eye out for ejector marks and flattened and cratered primers along with a sticky bolt. Every rifle and load seem to show signs a little different. With my 700 Sendero 300 RUM I sometimes see ejector marks a grain or so before I see other signs. Flattened and slightly cratered primers tell me in right on the edge and when I get a sticky bolt, that means back off. When I run a half grain below a sticky bolt, my primers are fairly flat with some very light cratering and an occasional ejector mark , but my primer pockets in my Rem brass hold up OK and my bolt moves freely. It's what I consider a "warm" load.

There can be other reasons for sticky bolts, flat primers, etc. and it's possible to get over pressure and miss the signs so you need to be careful. Im my experience, my rifle has always told me when it was time to back off.

Mark
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Old 01-30-2010, 08:35 PM
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Re: Help identify preasure signs ?

I just did some load development with my 6-284 built on a Savage target action.
When I measured the case head web area, I notice that up to .0015" greater than original case diameter still results in smooth bolt operation.
When it gets to .0020" I get noticable increase in bolt lift as well as a small ejector mark.
I will keep my charge at or below whatever charge gives me .0015 case head expansion on the first to second firing.
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Old 01-30-2010, 08:58 PM
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Re: Help identify preasure signs ?

Any pics of ejector signs, I also have not worked a load up to max( havent had to). But i would also like to learn about it.
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Old 01-30-2010, 09:05 PM
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Re: Help identify preasure signs ?

Quote:
Quote:
Originally Posted by yama49 View Post
Any pics of ejector signs, I also have not worked a load up to max( havent had to). But i would also like to learn about it.
\

On the Rem 700 it will be a bright shiny spot near the edge of the brass head. You'll know it when you se it.
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Old 01-30-2010, 09:09 PM
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Re: Help identify preasure signs ?

Something to keep in mind is that a lot of powders show increased pressure with increase of temp. If you work up a load in cool weather, it's probably a good idea to back off one or two grains and then give it another look in warm weather to see where your warm weather threshold is.
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Old 01-30-2010, 10:34 PM
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Re: Help identify preasure signs ?

Quote:
Originally Posted by dustybrown View Post
I have been handloading for about 3 years and have ALOT of fun and some sucess with my 22-250 and .243...in the last 6 months I have been loading for my 300 RUM. Its a lilja bbl 700 rem. I have played with rl-25 and retumbo and the 185 berger vld. cci 250 primers or fed 215's. neck sized rem brass at 3.68 coal. still fits mag. I have a brake on it and it still feels like some one punching me in the face when i shoot it. I can get past that recoil and im sqeezing of good shots, i guess... its shooting .7 " at 200. Im hitting fair at 850 yds.. My little experience with big charges has me scared to increase. Im running 94 grains of retumbo and the max listed by bereger is 96 gr. I know what to look for but ive never seen any preasure signs to know what it looks like. ???? (you get where im going yet ?) I know to look for primer flow and ejector marks but don't know what those look like... It's simply a confidence issue with my experience level. My MV with the 185 vld is 3060 to 3073 with the 94 gr. charge. Thats not letting me get to 1000 yd. with one rotation on my scope. 70 1/3 " clicks is well into the second rotation at a grand. I was told to try to get my MV to up around 3200 fps. this would also let me use less wind hold. any advice would be appreciated.. Thanx
There are several good indicators . The first is any bright places on the case head. This
is normally caused by the case head being pushed into the the ejector hole and then when
the bolt is operated it scrapes of some of the bulge leaving a round bright spot on the case
head the same size as the ejector .

Different primers will flatten differently because of cup thickness and hardness, So it is diffacult
to read them accuratly but if they are smashed flat with no radius on the primer edges it is
probably on the hot side.

Normally If you have heavy bolt lift it is hot and should be backed of by 1/2 to 1 grain of powder
and you will probably see all of the other signs mentioned.

When you really push them the brass will flow and looks kind of like galvanize but only a
different color and the cases get longer and have to be trimmed more often.

Velocity is also another indicator.(If you are getting quite a bit more velocity than the listed
Max loads) then you are pushing it.

J E CUSTOM
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