Cci 450 vs 7.5 toughness of cup

[LCazador]

I have been using cci 450, cci br4, federal 205m, 1990 vintage rws srp, new issue rws srp, 1980's vintage rem 7 1/2 (2 anvil) and newer rem 7 1/2 (3 anvil) primers in 6mm BR, .17 rem, 6x47 lap, 222, 223 etc.

Easy chambering and extraction of cases, satisfactory visual inspection of fired primers, continuing firm primer seating and removal etc all indicate pressures are not excessive in these calibres.

However, I no longer use the new 3 anvil rem 7 1/2 's due to the occasional pin hole leaks on the primer edges.

cheers

goodi

You think pin hole leaks are from primer brand or design?

 

[jelenko]

This is where I'm at on the fired cases with xbr and 7.5s. They shoot well just wondering if maybe the 450 or even the 205MAR would be better.

In what way better?

 

[Majday]

In what way better?

In terms of cratering, possibly staying away from a pierced primer if the 450s had a tougher cup. What I'm thinking may not make any sense. It is a thought I have. In the next day or two ill have to use some 450s and work up to the charge with 7.5s. That should tell me what I'm wondering.

 

[L.Sherm]

This is where I'm at on the fired cases with xbr and 7.5s. They shoot well just wondering if maybe the 450 or even the 205MAR would be better.

Only thing I see there is your bolt needs bushed, I use 7.5 with 3- 20p not saying it wouldn't be worth it to test a different primer. If your gonna get the bolt bushed then thats when I would do the test.

 

[Jeff Porter]

For my higher pressure loads I have found 205 MAR and CCI 450 to work well and give very similar results on chrono and on target.
R 7 1/2 will do the job too but personal preference will be to use the 450 or the MAR for those loads. Have never used BR4 so no basis for comparison.

 

[SKWERLZ]

If your not over pressure shoot the 7.5, 205, or 450 whichever is the most accurate.
If your load won't handle those you need to back it down.

Yeah
I treat those the same, all tougher than #400’s and 6 1/2’s.

 

[L.Sherm]

For my higher pressure loads I have found 205 MAR and CCI 450 to work well and give very similar results on chrono and on target.
R 7 1/2 will do the job too but personal preference will be to use the 450 or the MAR for those loads. Have never used BR4 so no basis for comparison.

For bigger cases like a BR ive found the 450 to be better than the 7.5 but smaller like 20P, 20VT etc the 7.5 has won out in accuracy but one should test different primers

 

[L.Sherm]

Yeah
I treat those the same, all tougher than #400’s and 6 1/2’s.

Only problem I've ever had was Rem 6.5 in a 222 rem mag in the early 2000's before I new better, I switched to 7.5 problem solved

 

[SKWERLZ]

Only problem I've ever had was Rem 6.5 in a 222 rem mag in the early 2000's before I new better, I switched to 7.5 problem solved

I had a similar experience with #400’s.
Good primer, just not for my application.

 

[L.Sherm]

I had a similar experience with #400’s.
Good primer, just not for my application.

I've used them in smaller cases like hornet an 30 carbine, work well in Calhoons 19 badger.

 

[SKWERLZ]

I've used them in smaller cases like hornet an 30 carbine, work well in Calhoons 19 badger.

22 hornet.