wymberley

The only time I've seen the like was some 50 years ago and they were living under a Nissan hut on a RAF airfield in Scotland.

Yep and I even paid the full whack for the HD rubberied version.

Don't forget that the given length of a cartridge refers to its open (fired) length.

I thought that the cartridges were 73mm. Although I KNOW not, with a proof requirement of 850 would these be a 70mm designate as per a 67.5mm 65mm 12 bore?

For some reason for your last post what is now above, 'lets see what......with' did not appear on my screen, but is there now. No, I don't think that it makes sense as for all intents and purposes one bar equates to one kg/square cm

Please don't act on this for the reason given earlier. However, it looks as though you have a albeit slightly undersize 3" chambered gun proofed at 1100 whatsits and also some either slightly oversized or undersized I know not which 70mm or 76mm cartridges which require a gun proofed at 850 different whatsits. My earlier request remains valid, but I believe the 850 would indicate a non magnum proof requirement.

KGs is a weight - can be confusing because - Italy for example - some countries mark the barrels with their weight. Try Kgs/square cm. One bar equals 1.01972 Kgs/ square cm - so, like for like in practice. I'm avoiding answering your original question as I know nothing about 410s not having shot one for some 70 years.

Welcome to PW. No you're not over thinking it as it's a perfectly sensible question. As you bought both at once, you could put them on the spot and ask the shop.

Is that ballistic calculator or Ballistic Coefficient?

Looks like this "bright future" is short lived.

I keep a half decent pair of Bushnell stashed in the car for serious looking but for a quick shufti I have half a pair in a dash cubby-hole. I don't know what's current, but back along if you found a decent pair in a charity shop there was usually something wrong with them: so one looked until you found a pair for which the defect did not affect the central focusing or the half secured to it and bought them. A quick hacksaw job and a nice little Zeiss 'monocular' which takes up no room and cost all of a £5er does the job nicely.

Brilliant! Thank you very much indeed.

Cheers. I asked because I haven't a clue. However, we have a chandlers so that's sorted but what on earth is, "cut it back by 75%, please? Now have a Screwfix as well. Thank you.

What chance is there of that when although there will be a shot size number given on the packaging what size that physically is is anyone's guess.

Some advice, please, Guys. I have just bought a garden bench seat which is flat pack and has already been pressure treated. Before it arrives in a couple of days could anyone kindly advise me on a quality brush on treatment which I would use annually - starting now before assembly - which hopefully will provide another layer of protection. MTIA