doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Old reloading data for the 410

I would think high pressure would show signs on the hull and head before reaching dangerous levels in a .410. Sticky hulls, etc.. Also, keep in mind that a typical .410 firearm is structurally capable of much higher pressures than a typical larger bore, especially a 12ga firearm.

For example, a typical 12ga 1040 steel barrel with .035 wall can handle 6500 psi at that location, which is approximately halfway down the length where pressures should be very low. A .410 barrel of the same steel with .035 wall can withstand 10,900 psi or 167% of the 12ga. The chamber area benefits similarly from the smaller diameter. But that doesn't consider that many .410 barrels have dramatically thicker chamber walls compared to a 12ga., often having wall thicknesses adequate suitable for metallic cartridge use.