AusVarmint

I've just necked up my 220 russian to 6mm. I will uniform the pockets and will sort them into batches by weight. Then I will neck turn them.

The flash hole is too small for a decapping pin to fit thru. Sinclar sell a reamer to open this to just allow the pin thru. I bought one.

Question, is the flashole designed to be so small for an accuracy reason? Does opening it out defeat that reason? Would I be better off having the decapping pin turned down to fit?

G'Day trev,
two things spring to mind.....
1. a small flash hole allows you to achieve higher chamber pressure before you pop a primer as it acts like a restrictor for high pressure gases trying to flow backwards into the primer pocket.
2. It probably intensifies(?) the primer flash to allow it to be more narrow and penetrate further into the powder column for more consistent ignition.

In case your wondering, most precision cartridges have the small flash hole (220russian and the BR case families) and opening them up to a large flash hole is not the usual done thing, certainly reaming them out to suit a small flash hole sized decapping pin is ok.

hope this helps

Cheerio Ned

Trevor,

The flash hole on lapua 220 brass is 59thou....you need to use the flash hole uniformer which is 62thou to get your decapping pin to fit.

If the flash hole uniformer is for the PPC then go ahead.....if its just for standard small flash holes then dont touch them.

The de=priming pin should be small than the usual one so it fits in the 220R case. Everything that I have ordered, be it PPC bases or BR case based, the pin fits everytime... because its a smaller pin!

You can buy the smaller pins. I would not touch the flash hole personally!

Cheers
AI

steven wrote:Trevor,

The flash hole on lapua 220 brass is 59thou....you need to use the flash hole uniformer which is 62thou to get your decapping pin to fit.

If the flash hole uniformer is for the PPC then go ahead.....if its just for standard small flash holes then dont touch them.

it is that one, sinclairs tool designed specially for PPC cases.

I checked the spare pin as too lazy to pull the die apart as I hadnt expanded the necks. Will try the pin in the die.

If I can get a smaller pin (Procal?) would it be beter not to deburr the flash holes at all and leave them at 59tho. I dont know that 3 thous more would make a lot of difference. Suppose when i learn to shoot it I can try some done and some at 59 thou.

just buy the smaller pins-
Please order a few of them-
I forgot about this issue when I was necking up 6BR to 30 BR and jambed a standard pin into a case- so I'll buy a couple of spares off you.

the smaller pins means there is not issue any more

LAter
p

Trevor.

De-burr and uniform the flash holes with your uniformer....thats what everyone else does...even the Wilson neck die wont let you de-prime your cases until you uniform the flash holes and they have right size pin....as far as i know you cant buy a pin smaller then the ones used for PPC cases so if your die de-capping pin is for standard small rifle flash holes you will have to by the PPC ones to fit.

Steve

Steven

I have the Wilson Neck die, and the pin fits the 220R case no problem. I have the flash hole uniformer, but wont use it.. I just deburred the flash hole by hand, which took hardly anything out as they were very good.

Check the photo out. Thats the Wilson neck die... I have taken the decapping pin out and stuck it into the PPC case. You can see the pin hanging out. There is no resistance, and you can feel movement between the pin and the hole.

Are we talking about the same die??



Cheers
AI

the sized cases now fit in the sleeve, guess what, the pin in the die fits!

Now why would they put a spare one in the box that doesnt fit? (redding comp dies)Huh

Chuck the pin up in a cordless drill and some wet and dry and the pin will fit,I personally don't open the holes up.

Regards Chris.

I wont either.

What powder and projies do you guys use?

BM2,BM2,BM2,BM2,BM2,My rifle likes,you guessed it 2219,no bm2 workes a treat,I get good load density,accuracy with this powder.I have also got a reasonable load using 2219 but why bother as it just cant match the bm2.
I have tried a few projectiles and am using Pro-cal 68gn 7 ogive's at the moment.

Regards Chris.

BM2 and Barts 68 grainers

cheers
Rinso

My rifle came together with

28.7grains 2219
68 Barts light jam (0.2mm more than a very soft jam)
CCI BR4's.

I think the 28.7g of 2219 is starting to get warm. I do not know how much of this stuff you can put in a case though!

Verdict’s still out on this load though as my test day was F*$% shit conditions!

Cheers
AI

i've got some bm2 as the 223 loves it, i'll get some 2219 to try as well.