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I apologize for showing my ignorance--

Could one fire a 350 No.2 in a 400/350 Double? Are both 35 cal?

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Are their pressure limits different? What are the specific differences if any?

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Yes.

.400/.350 2 3/4" Nitro Express: 43 Cordite/310 grain bullet = 16 tons BaseCUP for 2000 fps from 28" barrels.

.350 No. 2 Nitro Express: 51.5 grains Cordite (but usually loaded with NC)/225 grain bullet = 17.5 tons BaseCUP for 2550 fps from 28" barrels.

Current CIP MAP is 40,610 PSI for the .400/.350 and 47,862 PSI for the .350 No. 2.

The oddity with .350 No. 2 rifles is that, for some strange reason, almost all were marked as having been proved for the .400/.350 load (Cordite 43 - 310 MAX) instead of the No. 2 load.

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"Serious rifles have two barrels, everything else just burns gunpowder."

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