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Post by ET on Sept 5, 2020 20:41:35 GMT -5
Many moons ago when I first got my 10ML-II I was not impressed with their BP tool. I felt it was awkward to use and didn’t provide the torque for tightening the BP. I wanted to ensure that a good solid contact existed between BP and barrel mating surface to prevent gas cutting. As pressures increased with load developments, I just felt this was a more imperative consideration. After giving this some consideration I decided to weld a 3/8” drive socket onto the end of the BP tool. Now that gave me what I wanted from this tool. I now could provide the tightness to the BP I desired with a smack from a rubber mallet onto the ratchet and vice versa for loosening. Also, the removal and installation of the BP was an easier chore. This thread is not about bragging of what I have done but showing improvement can be achieved in some instances. I know a lot of readers have moved on from the 10ML-II and this is old news. But for any who are using older 10ML-II equipment may find this info useful.
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Post by mrbuck on Sept 6, 2020 4:55:45 GMT -5
Thanks for the post ! Never knew the plug should be that tight ... thought snug was good enough . Chris
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Post by ET on Sept 6, 2020 8:07:35 GMT -5
I don’t know how detrimental this gas cutting on the mated surface is. This can be largely minimized by tightening a BP. Personally I don’t know if this gas cutting can be totally illuminated but seeing a lot less in a way is comforting.
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Post by mrbuck on Sept 6, 2020 15:57:56 GMT -5
I never saw cutting like that on any plug but have been living with some blowback/carbon on bolt faces for many years . Chris
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Post by ET on Sept 6, 2020 19:20:26 GMT -5
When I was using 4759 that came in a 1/2lb can I was generating 35K bore pressure with a 250gr bullet. There I started to see signs of gas cutting. Once I tightened the BP with the modified tool I saw very little signs of gas cutting. Now I'm going to be working with higher bore pressure than 35K and want a tighter fitting BP. In your case I suspect you are generating lower bore pressure with your loads. The only way I know of reducing or eliminating blowback is adjusting the head spacing that allows the primer to be seated deeper into the BP.
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