What effects do magnum primers have on pressure.
The reason i ask is I have read that magnum primers are better for igniting compressed loads. I am loading 48 grains of imr 4064 under 110 vmax for my 308.
Would a magnum primer be suitable or would it raise pressure?

I am a reloading newbie so take it easy on me.

Are you having ignition problems? I have a similar compressed load for 7-08 with 48.5gr of imr 4350 and a 150gr bullet which is fine with standard primers.
I'm no expert but I'd assume magnum primers would kick the pressure up a little bit. Even still if you re-worked up the load carefully it should be ok i think.

I believe that magnum primers can kick the pressure up a tad. Loads using them should be worked up just like using any primer.

I load for both magnum and standard cases in both pistol and rifle. Years ago I quit buying standard primers and went to magnum primers for everything just to simplify my loading.

My loads are worked up looking for pressure signs and accuracy. Most of them are 10% under the top loads. I've found that staying at that 10% under loads that show signs of pressure usually gives about 30% better accuracy. I for one would rather give up a hundred feet per second for much better accuracy.

I load:
243 Winchester
280 Winchester
7mm Remington Mag (for a friend)
308 Winchester
8mm Remington Mag
357 Mag (for a friend)
41 Mag
44 Mag
45 ACP (for a friend)
45 Long Colt (for a friend)

Everything I load uses Magnum Primers and I have had no problems for the past 25 years since I decided to only stock one primer for pistols and one for rifles.

Welcome to reloading and I hope you enjoy it as much as I and the other members of this forum do.

None of my reloading manuals recommend magnum primers with 4064 in a .308 Winchester. 4064 is a medium burning rate powder and the .308 is a small case for a large rifle primer. A magnum primer will raise pressure and I'd stop a grain or two short of the standard primer load. A magnum primer may improve accuracy, and it may make it worse. The groups will tell you.

4064 is a bit slow for 110 grain bullets. Most of the books show around 100 fps more with 4895. I realize you're just starting and probably don't want the expense and clutter of a dozen different powders.

Bye
Jack

Thanks guys.
Jack you are exactly right. I use the 4064 because my manual shows it to be one of the fastest loads for my 308,270 and 30-30.I tried 3031 first but 4064 seemed to burn cleaner and was better for the 270.

Nathan i havent really had problems. But the compressed 3031 loads seemed extremely dirty which i attributed to powder not burning properly. I was thinking this due to the powder being compressed. (Am i way off here?)

Faucett so far i love reloading. i am quickly outgrowing my lee anniversary kit.
Between the 3 rifles i have been loading and the 45acp dies I just purchased and the 7.62x25 I ordered Im thinking setup might be simplified by going to a turret press and a turret for every caliber.

Thanks for the info gus.
Any and all opinions are greatly appreciated.

I dont use them unless im having ignition problems(lots of unburnt powder, etc) as ive always found them to make extreme spreads go through the roof and accuracy to suffer.

I agree with Jack. I use 4064 in my .308 Browning Lever and pop 2700 fps with 165 grainers! Using standard primers. This isn't like cooking, where a little creativity probably won't kill you....!

Thanks guys.
Jack you are exactly right. I use the 4064 because my manual shows it to be one of the fastest loads for my 308,270 and 30-30.I tried 3031 first but 4064 seemed to burn cleaner and was better for the 270.

Nathan i havent really had problems. But the compressed 3031 loads seemed extremely dirty which i attributed to powder not burning properly. I was thinking this due to the powder being compressed. (Am i way off here?)

Faucett so far i love reloading. i am quickly outgrowing my lee anniversary kit.
Between the 3 rifles i have been loading and the 45acp dies I just purchased and the 7.62x25 I ordered Im thinking setup might be simplified by going to a turret press and a turret for every caliber.

Thanks for the info gus.
Any and all opinions are greatly appreciated.

I've been using my Lee Anniversary kit now for several years and think I will stick with it. My hunting buddy just bought a Lee turret press and took out the auto index. He has each calibre in one of the drop in turrets and treats it like a single station press, just turns the turret for each operation. I've been eyeing his setup and might go the same way. I always hate it when someone else thinks up a better idea than I do.