I gave the Cheddites a go when they started importing them years ago. I recall a friend of mine mentioning "if you got a gun with a light firring pin strike Cheddites would be a good choice to help with reliability". He said this because his A5 would double using those primers. I found out how sensitive they are when one went off in my Ponsness Warren 800C press. No other primer ever did that in that press. I noticed that many of them would have black firring pin indents. I've seen that before with other primers but not to the extent that Cheddites did. I just considered it an annoyance and continued to use them never having any detrimental mishap. One day halfway around the sporting clay course I shot at a target and heard the report and a pop sound near my face. The pop sound was the far side of the stock on my RBL blowing out and falling to the ground. Since the RBL is a box lock, you have space between the parts to accumulate gas from a pierced primer. Can you imagine the effect of say 50+ PSI instantly in that space? Now I know why they put gas relief holes on European doubles! I've always preferred to use WW 209's but the cheaper price got me. If that had happened on a Rem 1100 or many other repeaters there would be no issue but not on a box lock. Makes a lot of sense in what Mr Hoggson said about the anvil length being longer, sounds like that could be the problem. Another issue with Cheddites is the larger diameter. After you use them in your favorite hull you will have to use them or other European primers. American primers will fall out if you try and go back. I have a good supply of the old WW AA compression formed hulls and only use American primers in them for that reason. So my friends be careful with Cheddites in your SxS's. Ballistic Products has them very attractively priced but I'll pass. I stopped using them because of my mishap but I guess I could like them again if I could not get American primers.
