.223 primers lifting

[skinner]

can anyone exsplain why my primers have lifted slightly i am loading 40g softpoints with 24.6g of 2460 and they are grouping into an inch at 100yrds.oh yes i am using sellier and bellot primers.

[Dougy]

can anyone exsplain why my primers have lifted slightly i am loading 40g softpoints with 24.6g of 2460 and they are grouping into an inch at 100yrds.oh yes i am using sellier and bellot primers.

 

 

pretty new to reloading myself so no great help really, but by lifting what do you mean is the primer protuding from the case base after firing or before ?

 

try different primers see if that makes any difference and check that the over all length OAL is ok

[Sako7mm]

Don't know if that's a stiff load or not. How many times have the cases been used? Primer pockets can get loose as the brass gets 'tired'.

What do the primers on fired factory rounds look like from your rifle?

[Graham M]

Top load is just over 27grns so it shouldn’t be due to pressure. But having said that it doesn’t mean that your not getting higher than normal pressures due to something else. You may have hotter primers than Remington 7½s which would be the normal sort of primer. Or you may have seated your bullets out too far and they are engaging the rifling causing higher pressures.

Try downloading to 24grns or a slightly slower powder such as 27grns of H380. 26grns of AA-2460 shouldn’t be a problem though.

G.M.

[nail]

Bear in mind that primers can also protrude after firing in very mild loads also but this is usually rare and generally can only happen with non-fireformed brass.

 

If you want to see it, just get a case with a primer only in and shoot it, the primer MAY protrude and will vary with case/chamber tolerances.

 

I didnt beleive this but I was prooven wrong with tthis very practical demo.

 

 

 

 

Are your primers flattened or cratered?B)?? Measure your brass at the web on a fired and unfired case and report back on expansion, it shouldnt be more than a few thou'.

[nail]

Bear in mind that primers can also protrude after firing in very mild loads also but this is usually rare and generally can only happen with non-fireformed brass.

 

If you want to see it, just get a case with a primer only in and shoot it, the primer MAY protrude and will vary with case/chamber tolerances.

 

I didnt beleive this but I was prooven wrong with tthis very practical demo.

 

 

 

 

Are your primers flattened or cratered?B)?? Measure your brass at the web on a fired and unfired case and report back on expansion, it shouldnt be more than a few thou'.

[nail]

You are not setting the shoulder back when you are loading them are you and creating a headspace. nail. sorry for the mess up guy,s new to this forum.

[skinner]

thanks guys computer went up the shoot so was unable to reply.

i reloaded another ten useing the same load, this time with unfired brass,the same thing happend only to three of them,the primer was definately seated correctly when loading,and if you hold the case flush with your eye the primer is raised,still looks like factory fired brass to me nothing looks different with the primer except the primer is raised.

very confused dont think i am doing anything wrong,or not to sure what to try next. B)

[nail]

IT SOUNDS LIKE YOU HAVE A LITTLE HEADSPACE TO ME, tO CHECK IT CUT SOME SHIMS OUT OF 1THOU BRASS SHIMM STOCK AND PLACE IT ON TOP OF THE HEAD OF AN EMPTY CASE AND ADD TILL YOU FEEL A SLIGHT RESISTENCE WHEN YOU CLOSE THE BOLT, AND THEN TAKE IT OUT AND MIKE IT , YOU SUOLD HAVE NO MORE THAN 6 THOU. CHEERS, NAIL.