#1
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17 Mach IV
Tested some new load for the 17 Mach IV using a 25gr Berger with H4198 (16.1gr) with CCI 400 primers. Nice accurate load but I'm seeing a few punctured primers (CCI 400). Should I switch to the BR4 primers? Remington 7 1/2 are hard to find right now.
Last edited by Phillip; 06-06-2016 at 03:23 PM. |
#2
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I would go to a thicker cup, PV has 7.5's in stock
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#3
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BR-4, CCI 450 or Rem 7.5 would work fine.
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#4
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Doesn't the CCI 450 (small rifle magnum) create more pressure? I would think the BR4 primers would be the next primer to try. Did find some Rem 7 1/2 primers today, so I think I'm good for now.
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#5
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Could be, but the thicker shell is what I would be looking for to eliminate the piercing.
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#6
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I believe the only difference between the CCI 400-450 and Rem. 6.5-7.5 is the thicker cup. I think it was james Calhoon who did a test on the SR primers. But as always when you change something it's a good idea to start low and work up.
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#7
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Phillip..........
What is the rifle?
What is the firing pin tip diameter? Kevin |
#8
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Rifle is Cooper model 34.
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#9
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And..........
.....the firing pin tip diameter?
Kevin |
#10
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If I was piercing CCI 400s and the firing pin tip was properly formed and rounded I would back off the load, not look for a thicker primer. Shooting this same load with a thicker primer when it gets real hot out is likely to create worse problems than just piercing.
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