What 3macs1 list shows is the changes in pressure as a result of a primer change.
You cannot assume that the relative "hottest" or "coolest" primer in these loads of 700x will give the same response with other powders.
True but I would bet it would be a similar pattern but would I risk it ???. You can see what is the hottest and coolest primer however and it is known winchester has always been the weaker
Almost impossible to find any exact tests done with blue dot today
Cheers
What we know so far
The Fiocchi 615 primer is a milder primer than the 616.
Not my words
Much has been said/discussed/debated on this subject.
The old rule about primer swapping is still as relevent as ever, however there are instances where some latitude is acceptable.
Whereas most all target ammo is developed on fairly low pressure load data, the substitution of some of the primers is considered as completely safe as there is much room above the listed load pressures and the max allowable pressures set down by SAAMI. A pressure rise may occur, but still will be within the max allowable pressures.
With this in mind, it is then considered safe to sub certain primers in 12 ga., so long as the Book listed pressures are 10,000 PSI or less. The SAAMI maximun for the 12 ga. is 11,500 PSI.
Any load showing pressures of above 10,000 PSI, should be loaded strictly by the book with NO substitution of the listed primer.
It is pretty much an accepted practice on the lower pressure target loads to base your loads on those using, or calling for the W/W W-209 primer. These loads are normally safe to use the W-209, the STS 209P, the CCI-209, or the Fiocchi 616 (209), or the Nobel Sport 209. Also by reducing the powder charge by 1/2 grain, you can use the Cheddite 209 or the REO 209.
It is never permissable to use the CCI 209M or the Federal 209A in any load not specifically calling for that primer. These primers are very hot and can cause excessive chamber pressures if not used as specified.
To directly answer your question as to substituting the Fiocchi primer for the Winchester, yes it is perfectly safe.
My personal testing has revealed the Fiocchi 616 (209) primer most nearly mirrors the STS 209P Remington primer, which is slightly milder than the Winchester 209. No increase in chamber pressures will be incurred by this substitution, in the lower pressure target loads.
The important thing to remember is, that you DO NOT substitute primers in loads that are listed with near max pressures. In these loads follow the Book data to the letter.
