CCI #34 in large volume "magnum" cases?

[Backyardsniper]

I have read this a lot and I was curious if anyone here has actually used these #34 in large cases, in place of magnum primers? I have a large supply of them and I want to test them in my 470. They also appear to be way easier to obtain than the elusive fed 215. I shoot them I most all of my 308, 30/06 type loads and if they are an equal to the magnums then I am just gonna buy a bigger supply of these and stream line my reloading components by only having to worry about finding one kind of primer.
Mostly just curious if anyone has actually tried using these in the big cases.

 

[NTX]

Yes! It’s basically just a CCI 250 with a slightly thicker cup. Works well in .375. Can’t tell you much after that as I still have Fed 215s but I would say if you’d use a 250 in a load, then the 34 will be fine.

 

[Backyardsniper]

I'm gonna give them a go. I have some primed cases with fed 216's in them and I have ran them next to the same load with 215's over the chrono with no difference. I am going to load up some of my go to loads in my 470 with the 34's and shoot them against the 215 and 216 loads and see if there is any difference.

 

[Luvthunt]

Pls let us know how you make out.

 

[Backyardsniper]

Pls let us know how you make out.

Will do. Seems like a pretty good experiment and if it works it will certainly make it easier to only have to worry about tracking down one kind of large rifle primer for all my large rifle needs

 

[Capt_Oscar]

Yes! It’s basically just a CCI 250 with a slightly thicker cup. Works well in .375. Can’t tell you much after that as I still have Fed 215s but I would say if you’d use a 250 in a load, then the 34 will be fine.

Actually they are not... I contacted CCI about this very issue. Here's their reply. I redacted personal info.

 

[NTX]

Actually they are not... I contacted CCI about this very issue. Here's their reply. I redacted personal info.View attachment 547623

Very interesting, thanks for the reply. I wonder at what charge weight that really starts to matter at. Probably would be bad in a large volume case that isn’t densely charged. I have had no issues in an H&H case, but that isn’t high volume and the “safety” is certainly anecdotal evidence

 

[sestoppelman]

All I ever used in my .375 with full charges of slow powder were CCI200, standard large rifle. Worked perfectly

The #34 is aimed at the semi auto battle rifle crowd but I have always understood it to be as above, a 250 with slightly thicker cup. CCI's reply sort of surprises me.

 

[Capt_Oscar]

In my convo with CCI: #34 primer was designed to prevent slam fires in semi-auto/full auto firearms. I asked if that meant they were used for 300Win Mag ball powder ammo. That was a NO. 308win ball powder was what they were designed for to ensure proper ignition in all conditions (Arctic to desert). He elaborated that the case volume of the 300Win Mag called for the CCI250 if you wanted consistent/proper ignition in all conditions. Likewise, similar case volumes and/or larger it was advised to use the CCI250. He had no concerns with anything in the 30-06 case head size using the #34 especially when using ball powder for better ignition. He did say, the #34 will ignite the 300Win Mag, but you may get large swings of velocity deviation and that would present problems at longer ranges.