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Joined: 13 Sep 2009 Posts: 41

This load came from the spreadsheets but with less powder. I believe there were 2 loads that used 27 and 29 gr. of Longshot with the same components. I just backed off the powder from the 27 gr. as I don't think there was a 24 gr. load listed with the exact same components. Anyway, I may back off a grain or 2 more and see what happens.

John

Fiocchi 16 1-1/8 oz. Longshot 22.5 Fio 616 BPI SG 16 1200 7,700 Lyman 5th
Fiocchi 16 1-1/8 oz. Longshot 23.0 Win 209 Rem SP-16 1181 6,700 Lyman 5th
Fiocchi 16 1-1/8 oz. Longshot 22.0 Fio 616 VP80+14FW20 1300 11,200 Ballistic Products OS 16
Fiocchi 16 1-1/8 oz. Longshot 22.0 Fio 616 VP80+18FW20+spreader 1300 11,200 Ballistic Products OS 16

Fiocchi 16 1 oz. Longshot 23.0 Win 209 BPI SG 16 1248 7,100 Lyman 5th
Fiocchi 16 1 oz. Longshot 23.5 Fio 616 Rem SP-16 1284 7,300 Lyman 5th
Fiocchi 16 1 oz. Longshot 26.0 Fio 616 BPI Z 16+X Spreader 1290 10,400 Ballistic Products OS 16
Fiocchi 16 1 oz. Longshot 28.0 Fio 616 BPI Z 16 1470 9,700 Ballistic Products OS 16

From the spreadsheet

Joined: 16 Jul 2015 Posts: 2126 Location: Hudson,Wy

One thought on the raise in pressure with a once fired hull vs. a new one: with many 2 piece hulls the base wad is somewhat compressible before exposed to the pressure of firing and some of this elasticity dampens the pressure peak. After firing, the base wad looses a bit of that elasticity. How much of the pressure increase is caused by this compared to increased hull friction I am not able to quantify.
I do wonder if compression formed hulls show this same tendency to compact the "base wad" section and to what degree they do.