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#3003718 - 10/28/12 03:18 PM 243 win pressure spike
SEC
6 Point


Registered: 11/01/10
Posts: 639
Loc: TN

content Online
I worked up a load for my ruger 243 last year. The data came straight from hodgdon's website 95gr nosler partition,h4350. The starting load was 39gr and the max was 42gr. I settled on 40gr accuracy was great and all was well. Today I go to shoot and after the first shot the bolt would hardly come back to extract the brass shot it again same results primers were a little flattened. I have heard of strange pressure spikes with the 243 but its hard to understand why this lot of ammo would be fine last October and not now.
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#3003782 - 10/28/12 04:01 PM Re: 243 win pressure spike [Re: SEC]
mike243
16 Point


Registered: 09/06/06
Posts: 11677
Loc: east tn

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Temp maybe?
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#3003927 - 10/28/12 05:33 PM Re: 243 win pressure spike [Re: mike243]
ratsnakeboogy
10 Point


Registered: 08/28/08
Posts: 3484
Loc: Andersonville, TN

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Pull a couple and re-weigh your charge on a freshly zeroed scale. I had a batch that ended up 3 gr over max one time due to something with the scale. I now weigh every charge 3 times.

Check overall length as well, if you are jamming into the lands, it will spike quick and high.

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#3004917 - 10/29/12 06:18 AM Re: 243 win pressure spike [Re: ratsnakeboogy]
7mminatree
6 Point


Registered: 01/12/12
Posts: 568
Loc: Unicoi Tn.

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Also, you might check your case length. If they are close to 2.045 try timming them down to 2.035, resize and try, providing you didn't over charge.
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#3005700 - 10/29/12 12:28 PM Re: 243 win pressure spike [Re: 7mminatree]
DaveB
10 Point


Registered: 09/03/08
Posts: 3850
Loc: Shelby County

content Online
All the above. That load is not near max, either your COL is too long or you have a load error. Flattened primer with that load is a heads up something not right. I run 43.5 grains of RL19 in my 243, 95 grain partitions, I get flat primers but back it off two grains and its gone.
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#3006686 - 10/29/12 09:24 PM Re: 243 win pressure spike [Re: DaveB]
Mid
4 Point


Registered: 10/06/12
Posts: 200
Loc: Kingston Springs, TN

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.243 is hard on brass...sharp shoulders and high pressures anyway...i reload a lot of them. if you are loading the same brass over and over in .243 they become "case hardned" pretty quick. i anneal my cases every 3rd load and after 3rd anneal i toss them. this is not "the" reason for sticky cases and pressure signs but an other thing to look at. BTW i run 105AMAX over h4350 at +2 over book but i worked up to it very slowly to the accuracy node in my rifle....nasty hunting round
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