Primers -- Standard Large Rifle VS Large Pistol Magnum

[dale2242]

I have an excess of large pistol magnum primers.
How would these compare with standard large rifle primers in light cast loads.
I am aware of the height difference.
I am talking of loads in the 10 gr. of Unique range.
Have you tried them?...dale

[Larry Gibson]

Dale

You don't mention which cartridge? A purview of posts #1, #14 and #16 in this thread may provide some insight into your question; http://castboolits.gunloads.com/showthread.php?142155-LR-primers-in-the-44-Magnum

[dale2242]

I plan on trying them in 30-30, 7.62X54r and 30-06 size cases.

[Larry Gibson]

The LPPMs will work fine in those cartridges with cast bullet loads.

[dale2242]

Thanks Larry.
I was pretty sure they would be fine.
I`m working with the bullets you sent me in the Mosin Nagant....dale

[skeettx]

Waiting for the report
Should do well

Mike

[Larry Gibson]

Waiting for the report
Should do well

Mike

Me too....!

[ioon44]

This is the opposite of what the OP is trying but I found it interesting.
I wanted to use up some 215 Fed primers so I used a primer pocket tool to seat the 215 LR in .45 ACP cases. I used the same light load that I am loading in .45 ACP with a WSPM primer and run both rounds over the chrno and found the 215 LR primer showed about 50 FPS less than the WSPM primer. This was out of a 5" 1911.

[Larry Gibson]

There is a wide variation in primer "strength" even with standard primers. Changing primers in small cases such as pistol cases can have a drastic effect on pressure if one is pushing max loads for the cartridge or firearm. In larger rifle cases (30-30 capacity and larger) with lower pressure cast bullet loads the difference is smaller because of the case volume. However it still must be accounted for. That's why "start low and work up" is always sage advise when making a component change such as primers. Here the chronograph is your best friend. Drop the charge a bit and work back up to the same velocity as the other primer gave.

With the 30-30, 7.62x54R and 30-06 dale2242 is using the charge 10 gr Unique generates pretty low pressure even with the heavy bullets he is using. A tweak of the charge may be necessary for optimum accuracy though.