CCI 300 instead of CCI 350

[snapbang]

I have a few of the CCI 350s left. Enough for a year or two because I dont shoot them much. If I substitute the 300s for the 350s will there be much difference? Im loading 44 mag for a Ruger carbine, 240 grain Hornady XTP, and Win296 powder. The Win296 is the same as H110. Im loading 24.5 grains of Win296.

Reason I ask is I used CCI200 and CCI250 primers for many types of bottle necked cartridges. 243 win, 308 win, 270 win, 30-06 Springfield, 338 Winmag, and others for 35 years. Never could tell a difference between the two primers for any gun for any load.

Im not looking at same hole accuracy but 1" groups at 100 yards are sufficient.

 

[MTY]

Ball powder pretty much requires a mag primer for consistent ignition.

 

[snapbang]

I have some IMR 4227. Would that be better with the 300 prime?????

 

[Les Harris]

Try a few and see what the results are. Let your gun tell you what it likes. Except for Ball powders I do not use Magnum primers.

 

[snapbang]

Thats what it always boils down to isnt. You just need to let your gun tell you what it likes.
Thanks Les.

 

[michiganmuzzy]

Im loading w296 in some 450 bushmaster rounds and everyone told me the same thing, 'only use mag primers with that powder'.

 

[MTY]

If you are running this ammo in a gas operated carbine, you also want to make sure the pressure curve of your reloads matches the pressure curve of ammo the gun was designed for. That is standard factory 240 grain. If the peak of the pressure curve hits the gas port at the wrong time, it can damage the rifle. For instance, it the peak hits the port late, and the action has started to unlock, the bolt will be driven rearward at too great a speed.

 

[snapbang]

 

[D55]

I agree with the statements of others and though I no longer shoot anything but sml's, I can attest to, use the primer called for in load data/manuals as slower rise to peak powders require a little hotter ignition. Several yrs back I tried a lg rifle primer,should have used lrmp, with retumbo and ruined a rifle. I was not hurt but it could have been much worse. I understand with the shortage of components wanting to use something else. If you go hotter primer back off the powder a couple gr. JME

 

[snapbang]

Thats why I asked. Thank you folks for sharing.

 

[MTY]

I dug out some old Ken Waters articles on the carbine and the powders you listed. According to him all three will work, but require mag primers.

 

[snapbang]

thank you MTI. I had no idea such articles existed. Nice to know I stumbled in the right direction.

Ive made a commitment to the mag primers.

 

[MTY]

Ken Waters wrote for Handloader magazine. His articles are available in book form. The title is "Pet Loads." My copy is the original, there have been several updates. There were about 40 years worth of articles included in the latest update. I am sure he missed some cartridges, but not very many.
Waters' book is the one manual no handloader should be without. It provides information about the whys and hows of handloading a particular cartridge along with the data.