Primer backing out with plastic bullets

[Trigger Guard]

Bought some plastic bullets for my 45LC and the primer is backing out. I have tried to crimp just enough to hold in the shell and it still backs out almost to the point that I cannot open the cylinder. Could it be that insufficient pressure is generated to press the case against the firing pin?

I thought I read in another thread (couldn't find it) that the primer hole must be drilled out and that will alleviate the problem. Will that work, and if so, to what size do i ream the hole?

Thanks

[Chief-7700]

Let see if understand this.
What are you crimping the plastic bullet of the primer.

[Fjold]

Yes, there probably isn't enough pressure.

The primer backs out and there isn't enough thrust on the case to seat it back. You might check that your primer holes aren't oversized due to aggressive crimp reaming or too many reloads.

[7x57]

Yes, there probably isn't enough pressure.

The primer backs out and there isn't enough thrust on the case to seat it back.

What Fjold said. But I've never thought about the firing sequence for plastic bullet loads, so this is sort of interesting.

I want to understand the normal plastic-bullet situation, which I assume doesn't leave the primers sticking out. With full-power loads, at least at rifle pressures, the forward part of the case is stuck by friction while the head stretches the rear part until it stops against the bolt face, re-seating the primer. That can't happen here, so is the normal situation that the pressure is low enough not to seal the case mouth against the chamber but high enough to move the whole case backwards? Or is it that the pressure is too low to even back out the primer? If people are saying to open up the primer hole, I am going to guess the latter.

7x57

[ojisan]

The case does expand slightly and stick in the chamber.
The primer is pushed rearwards, and you are correct, the case does not stretch far enough backwards to push against the breech face and reseat the primer.

Opening up the flash hole is the thing to do...this keeps the primer's own power from compressing in the pocket and pushing it out of the case.
Keep opening the flash hole up a little at a time and test until the primers stay put.
You can use the same case over and over for this.
However, wax /plastic bulleted cases with enlarged flash holes can never be used to load regular ammo again...keep them separate from now on.

[gunboat]

+1 on opening up the flash hole ----

[TKM]

Open them up and mark the cases with a big sharpie or something. Black out the entire headstamp or ring the case. Fix it so that there is no way that anyone can look at it and think it's just a normal case.

I managed to blow the power button out of my vcr by compensating for nonexistent muzzle rise. Be careful playing indoors.

[Trigger Guard]

Thanks, just as suspected. I think I will die the cases with enlarged holes to help identify them as I shoot a lot of LC.

Is this to be expected with all revolver loads shot with plastic projectiles?

[smoothy8500]

X-Ring rubber bullets instruction pamphlet says to drill open the flash hole to prevent primer backing out. Happens with some of my 45 ACP.

[383green]

My old Speer #9 reloading manual says to drill out the flash hole to 7/64" when using their .45 plastic bullets in .45ACP cases to avoid primer setback.