I forgot to mention this...I have always been pleased with the preformance of my ACCURA, accuracy has been more than I could hope for. The little bit of blowback I got did'nt matter much as it was very minimal. I just wanted to see if I could get it eliminated or just about. The BP does have a hole too big for most Primers and a smaller hole would probably make a big difference. When CVA comes out with the New ACCURA with it's new and improved BP it should be a ML that would make anyone happy to own. The 3 I have now are good enough for me so I cant wait to see the newer ones, they should be a awsome ML for the money.
(BP)

Breechplug
Have you tried any Winchester 209 reloading primers? They are the longest primer and I was wondering if the length would help control the blowback with out an O ring. Lee

Lee do you mean the Win W209 Primers? if so I have them, they are slightly longer but Im not really sure this is the cause. As mentioned above in my other reply, the Primer Hole in the ACCURA's BP it too big, all the primers I have tried in the BP are too loose fitting. Most of the blowback is getting through there I suspect. If the primer hole was smaller Im sure this would eliminate most of the problem.
I have tried the T7, Win W209, Rem. Kleenbore and CCI's, there all loose in the BP. I know the longer primer would lessen the blowback but not eliminate most of it.
(BP)

Breechplug

If you make the primer holder area much smaller you might have a problem getting a spent primer out of the cup.

The primer casing acts much like the brass shell casing in your rifle. As it is shot and pressure is exerted the primer can swell to the walls of the cup to created a seal as does a conventional shell casing. After shooting and with some cooling the primer then should contract back to some where it's orginal size so that it can be easily removed. Problem... aliminum/steel batter cups that you find on on a lot of primers today (less expensive) do not expand as well nor do the contract back done as well or as fast.

One of the reasons that I like the Cheddite and and Rem's are they still have conventional Brass battery cups.

BP you may have experiance this in your trap shooting - Shotgun shells with a true brass base, seem to last longer and work smoother (Winchester AA's or Remington STS's) than the steel bases or steel bases that a plated with a brass color. In my Rem 870 with the 28" factory barrel the steel shotguns shells will actually get stuck unless I really wait for them to cool.

Just thinking off the top of my head....

True about the Primers and Trap Shooting experiences with reloading and shooting, but the ACCURA's BP's primer holding area is the loosest of any BP's I ever had. As you mentioned though after the primer is shot it does fit tight in the primer cup. During the firing of the primer does it expand so fast to fill the gap that it does'nt allow any blowback to escape?
(BP)

Breechplug

That I do not know - but i would think that when the back pressure hits it would cause the primer to enlarge. Again I am not sure, but the certainly got something right with the TC speed breech and the primers wobbles in it also.

Well, i ordered vent liners from Lehigh on the 7th, and had hopes they would have arrived here today, but they didn't. In anticipation of their arrival, i started the work on the breech plug of my Accura toward making it more like the Omega breech plug.





The plug on the left is a brand new Accura plug, the one in the middle is an Accura plug that has seen many shots, modified to accept a vent liner, and the plug on the right is an Omega plug.

Now, when the vent liners arrive here, i imagine the modified plug may require a little more work to be just right, then it will be off to the range.

Ron I cant wait to see your results.
(BP)

Ron, did you get your vent liners yet??? Just wondering how your doing on your BP Project?
(BP)

Both the Savage, and the Lehigh vent liners arrived here yesterday.

I began with the install of the Lehigh, and it seemed to work quite nicely. The unmodified Accura breech plug on the left, the modified Accura breech plug centered, and the unmodified Omega breech plug on the right.





Then, i gave the savage vent liner a try, and it also fit nicely.



I decided to install the Lehigh vent, and loaded the Accura that has factory open sights, with 105g BH209, Harvester Smooth Sabot, 300g xtp, and W209 primer.

This morning i headed for the hills, set out a target, and moved the truck to the place i normally park it, which turned out to be 101yd from target according to the laser range finder.

The first shot was into a stump, and then i fired 8 shots at this target:



The rifle appears to be shooting some high now, with this modification. Ignition was instant, and i ended up loading and shooting the rifle about 16 times before going hunting. Blowback may have been less than what it was before being modified, but then again maybe not.

After returning home from hunting, i replaced the Lehigh vent liner with the Savage vent liner, and will try it out tomorrow morning.