@ the Farm again with ole #09
02-19-2010, 11:58 AM
#1
Boone & Crockett
Thread Starter
Join Date: Aug 2004
Location: Idaho
Posts: 11,703
@ the Farm again with ole #09
Headed out to the farm again this morning after retrofitting my NFPJ breech plug to tighten the fit of the primer in the BP.
The retrofit, adding a thicker stainless washers seems to have worked and accomplished what i was after. I only had time to shoot a few rounds + I wanted to shot a wide range of primers from the longest down to the shortest.
But.... after stopping the blow back - another problem has reared it's head.... Nostradamus, aka Busta has predicted this possible problem in several of his posts. His concern about the Knight firing pin was it was to large and may induce blow back leaking from between the primer and the battery cup. I did not get that problem, but I did get a pressure problem forcing the primer back out of the battery cup and into the bolt face. The problem arises with the size of the opening in the face of the bolt where the firing pin comes through. The backed out primer wedges itself in that opening and will easily fall out of the bolt when you tip the gun to the side. By closing the bolt and dropping the hammer again the the primer is forced out of the face of the bolt and then will fall right out.
Of all the primers I shot only the Remington 209-4 did not exhibit the problem....
so at this point I am done! time to move on...
Here is todays picture....
The retrofit, adding a thicker stainless washers seems to have worked and accomplished what i was after. I only had time to shoot a few rounds + I wanted to shot a wide range of primers from the longest down to the shortest.
But.... after stopping the blow back - another problem has reared it's head.... Nostradamus, aka Busta has predicted this possible problem in several of his posts. His concern about the Knight firing pin was it was to large and may induce blow back leaking from between the primer and the battery cup. I did not get that problem, but I did get a pressure problem forcing the primer back out of the battery cup and into the bolt face. The problem arises with the size of the opening in the face of the bolt where the firing pin comes through. The backed out primer wedges itself in that opening and will easily fall out of the bolt when you tip the gun to the side. By closing the bolt and dropping the hammer again the the primer is forced out of the face of the bolt and then will fall right out.
Of all the primers I shot only the Remington 209-4 did not exhibit the problem....
so at this point I am done! time to move on...
Here is todays picture....
02-19-2010, 01:32 PM
#5
Boone & Crockett
Thread Starter
Join Date: Aug 2004
Location: Idaho
Posts: 11,703
Lee
It is that big... and the hole is just a bit smaller than the primer itself. When you look at the head of the primer you can see where it pushed itself in the hole just enough to stick. Floating, not sure what you mean - but it could be pushed all the way back to re-kock if the bolt face were not present....
It is that big... and the hole is just a bit smaller than the primer itself. When you look at the head of the primer you can see where it pushed itself in the hole just enough to stick. Floating, not sure what you mean - but it could be pushed all the way back to re-kock if the bolt face were not present....
