Do we still need both large and small primers?

The only time "more work/more cost" for a manufacturer is when a new product is being manufactured. With the billions of primers made so far and all the different types, the equipment costs are nil. Switching over to one size primer would not save any money except for initial set up with existing equipment. Same compounds, same employees same packaging. I believe there are certain specific needs being met by the different size and "power" primers to keep all in production...

Rule3 said:

This difference in primer cups is thickness not "hardness" Although thicker is construed to be "harder"

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ATLDave said:

Yes, if for no other reason than cup hardness. Some people need federal-soft primers for their soft-springed DA revolvers. Some people need CCI magnum-hard primers to keep hot loads from cratering in a gun with a loose firing pin hole in the breech.

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"Soft Sprung" revolvers are a self made issue and not the correct way to do a "trigger job" SPmagnum primers are only needed with a few hard to ignite powders, mainly H110/W296. Same with LP primers. Rifles are a but different due to the volume of powder to ignite and most is slow burning.

People make more to do about primers than is necessary and there are those that only wish to debate and scrutinize mostly irrelevant factors.
Use the primer brand that works best for your load, gun a personal preference,

ATLDave said:

Yes, if for no other reason than cup hardness. Some people need federal-soft primers for their soft-springed DA revolvers. Some people need CCI magnum-hard primers to keep hot loads from cratering in a gun with a loose firing pin hole in the breech.

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This...
I need both. I have 2 revolvers that won't fire CCI primers.

South Prairie Jim said:

There was a study on the effect of flash hole size on accuracy,
example- Dasher cartridge with a drilled out flash hole suffered in accuracy as the hole was enlarged .

Addendum- I’m trying to stay away from conjectural posts therefore the above is as far as I’ll go.

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no conjecture here. the ppc cartridge line owes its success, in part, to the smaller diameter (.066" instead of .080") flash hole. I believe the 220 swift is more accurate than the 22-250 for the same reason.

murf

Nature Boy said:

I recently made the switch from .308 Win LR primers to .308 Palma SR primers. Primary reason was to get better brass life when running competition loads for F Class. I've read that ES and SD is better with SRP vs LRP when comparing .308 although I've yet to test it myself.

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better structural integrity is probably why the cases last longer with those top pressure loads.

murf