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Lapua Brass question

 
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Old 08-09-2004, 09:49 PM
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Re: Lapua Brass question

I will give you guys a little back ground on what I am having trouble with. [img]images/icons/smile.gif[/img] I have the same powder that I used in my old cases from last year and I bought 200 new win 284 cases this year because the old ones are starting to wear from being used. If I take a case from last year and fire it with 52.5 grains of IMR-4831 with a 95 grain Ballistic tip I get 3557 fps and a group in the low .2's Now if I take a new case with the same powder and bullet I can only load up to 52.0 grains I still get a group in the low .2' but I only get 3490 fps. If I load to 52.5 grains with a new case the bolt starts to get sticky. All cases are cut to the same length and sized the same. I do not have a tight neck but I turn them because when you neck a 284 down the necks get thick so they are turned the same. The only thing I can come up with is that the case wall on the new cases is different then the old ones but other than that I am at a loss. [img]images/icons/confused.gif[/img] Another thing with the Winchester brass is I can only fire them about 5 to 6 times then they start to wear out and the primer pocket starts to expand and they really start to stretch. I mean I would not change brass for group size because it is a 1/4 inch gun and it will shoot a 1/4 inch group with most bullets so that is not the issue I would just like more consistant brass if possible.
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Old 08-10-2004, 07:55 AM
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Re: Lapua Brass question

dakor, thanks for your load information kind of helps out. You are at max or over according to some manuals and velocity is better than a 240wby. I weighted some of my fires as to capacity with powder and the hornady and win weighted the same laupa had 1/2 gr more volume. I've always gone for groups and for me if I had a non tight neck rifle shooting in the 2's I would leave it alone.
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Old 08-10-2004, 12:13 PM
LB LB is offline
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Re: Lapua Brass question

Dakor, how many rounds are through this barrel? It seems to me that you are going through a lot of brass, therefore you should be aware of the seating depth, as throat errosion occurs.

What do you mean, the brass starts to "wear out"? Two common reasons, split necks and/or enlarged primer pockets. Both can be reduced by backing off the powder charge a few clicks.

Just generally, your data doesn't seem entirely logical; but maybe that's just me?

Good hunting. LB
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Old 08-10-2004, 03:47 PM
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Re: Lapua Brass question

LB I guess I do not know how to explain my data any better the old brass and the new brass are on the same playing field but not performing the same is about all I can say. As for rounds I have around 1000 through it and I seat all my bullets 30k off the lands except VLD bullets wich are about 10K in the lands. What I mean by wear is they really start to stretch after 6 firings and I have to cut them after everytime I fire them wich gets old. The primer pockets start to loosen up around the 7th or 8th firing. My handloads are not hot the bolt does not stick and there is not any ejector marks so I do not know how they could be? [img]images/icons/confused.gif[/img] I talked to my Smith that built the Rifle for me he said that Lapua would be the best bet that is what he shoots and he said the groups might not change that much since I am already shooting 1/4 inch groups but the case life would be about double of what I am getting. So I think after deer season I will be ordering some Lapua brass.
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Old 08-10-2004, 04:17 PM
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Re: Lapua Brass question

Dakor
If the Lapua brass fits the chamber use it.It sounds to me that the newer lot of brass has less internal volume. This is very common when switching lots or brands of brass in a given cartridge.Lapua in my opinion doesn't always measure the best in neck uniformity when compared to Norma but as i neck-turn this doesn't matter as much.It really seems to outlast the Norma which many claim is softer.I don't think the Norma is softer than Lapua just smaller in the web area.What this means is as you fire it the cases will stretch and the pockets will loosen faster as they don't fit the chamber as well.Charles Ellertson of 1000 yard fame brought this up on another forum and some measuring of cases seems to show he is correct.
Lynn
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  #13  
Old 08-10-2004, 05:36 PM
 
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Re: Lapua Brass question

crow mag you are right about the statement about the lapua working in the winchester chamber it won't the lapua brass is what I use after to rechambered for lapua love the lapua brass though. You can't go wrong.
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  #14  
Old 08-10-2004, 06:48 PM
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Re: Lapua Brass question

I have heard of Smith's chambering Ackley's to a certain kinda brass but not anything else. You learn something new everyday [img]images/icons/grin.gif[/img] Mine is a standard chamber well some what standard my smith chambers the rifles he builds to his benchrest specs with zero head space there is no slop in the chamber at all it is nice and tight I am glad I did not ask for a tight neck. [img]images/icons/shocked.gif[/img]

[ 08-10-2004: Message edited by: dakor ]
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