ilovemyheckler Posted August 13, 2011 Report Share Posted August 13, 2011 having just bought a Miroku MK70 Sport o/u from this site I have been reding the booklet that came with it. The gun has fixed invector chokes - top barrel is 3/4 and the lower barrel is 1/4. However it says that the top barrel (3/4 choke) should not be used with cartridges containing steel pellets - Why is this and what would happen if I did? Am I right in thinking that some shoots don't allow lead pellets? What about clay grounds, does the same apply to some? Thanks Quote Link to comment Share on other sites More sharing options...
Bad Monkey Posted August 13, 2011 Report Share Posted August 13, 2011 Others will be more knowledgeable than me but i believe that generally speaking steel shot shouldn't be used in anything tighter than 1/2 choke, hence it not being suitable for your 3/4 choked upper barrel. I also believe steel is used mainly for wildfowling. Quote Link to comment Share on other sites More sharing options...
mpk Posted August 13, 2011 Report Share Posted August 13, 2011 (edited) As said above steel can't go through anything tighter than 1/2 choke as steel is harder and does not deform like lead Edited August 13, 2011 by mpk Quote Link to comment Share on other sites More sharing options...
JJsDad Posted August 13, 2011 Report Share Posted August 13, 2011 Steel shot should not be used in anything tighter than 1/2 choke with a gun that was originally proofed for lead cartridges. Steel does not compress like lead & you run the risk of bulging the barrel or worse if you decide to use it. If you must use steel, you should really look at getting the top barrel opened out to 1/2 choke by a competent gunsmith. Quote Link to comment Share on other sites More sharing options...
Bad Monkey Posted August 13, 2011 Report Share Posted August 13, 2011 Steel shot should not be used in anything tighter than 1/2 choke with a gun that was originally proofed for lead cartridges. Steel does not compress like lead & you run the risk of bulging the barrel or worse if you decide to use it. If you must use steel, you should really look at getting the top barrel opened out to 1/2 choke by a competent gunsmith. Good point! and can often be done for around £40 ish. Quote Link to comment Share on other sites More sharing options...
chrispti Posted August 13, 2011 Report Share Posted August 13, 2011 If you must use steel, you should really look at getting the top barrel opened out to 1/2 choke by a competent gunsmith. As long as the barrels are proofed for steel! Quote Link to comment Share on other sites More sharing options...
mpk Posted August 13, 2011 Report Share Posted August 13, 2011 As long as the barrels are proofed for steel! Good point Quote Link to comment Share on other sites More sharing options...
EdSolomons Posted August 13, 2011 Report Share Posted August 13, 2011 Also worth noting that a few clay grounds van the use of steel. Only 1 I'm aware of in the country that has banned lead and that is because I think they are on a SSSI or marshland. Quote Link to comment Share on other sites More sharing options...
ilovemyheckler Posted August 13, 2011 Author Report Share Posted August 13, 2011 thanks for all the replies. Am i right in assuming that if 1 barrel can use steel then both barrels (ignoring the choking for now)are proofed for steel? Quote Link to comment Share on other sites More sharing options...
scarecrow243 Posted August 13, 2011 Report Share Posted August 13, 2011 Hi i dont think your gun is steel proofed check the proof marks, also the cartridges are the low velocity ones that your gun will handle heavy loads are a no no Quote Link to comment Share on other sites More sharing options...
JJsDad Posted August 13, 2011 Report Share Posted August 13, 2011 Your Miroku has almost certainly been subjected to normal proof & as stated previously can be used for "normal" steel shot loads providing it is no tighter than 1/2 choke. With due respect to chrispti, he has mislead you slightly. You do not need the special steel proof to fire standard steel loads. You only need the superior steel proof if you are thinking of using high velocity steel loads in for example loads of 1 1/4oz or above. These HV steel loads will invariably make it clear on the box that they are for use in guns with the the higher proof pressure. Quote Link to comment Share on other sites More sharing options...
Ratman2 Posted August 13, 2011 Report Share Posted August 13, 2011 Well I'm going to throw a spanner in the works here, I've shot thousands of Gamebore Super Steel through an MK38 with fixed 3/4 and full chokes, no detrement to the gun at all and fantastic results. There seems to be a lot of scare mongering and myths about steel. Quote Link to comment Share on other sites More sharing options...
HDAV Posted August 13, 2011 Report Share Posted August 13, 2011 Gamebore have soem guidance on their website about it http://www.gamebore.com/page.php?id1=15 however high perfomrance steel or large size steel shot is different to clay loads of 7.5 steel and not all steel carts are the same. Quote Link to comment Share on other sites More sharing options...
Peathag Posted August 15, 2011 Report Share Posted August 15, 2011 having just bought a Miroku MK70 Sport o/u from this site I have been reding the booklet that came with it. The gun has fixed invector chokes - top barrel is 3/4 and the lower barrel is 1/4. However it says that the top barrel (3/4 choke) should not be used with cartridges containing steel pellets - Why is this and what would happen if I did? Am I right in thinking that some shoots don't allow lead pellets? What about clay grounds, does the same apply to some? Thanks As you do not live in Sweden then you have little reason for using Steel shot unless you wanted to go wildfowling with this gun - which I doubt. I have used steel in my old open choked side by side to clear a pond of wildfowl and its performance was poor. Most clay grounds that I frequent don't allow steel due to potential ricochet's so what is the point as it is a poor substitute to lead. Also in your case where one barrel is to tight and the other is ok for steel you could easily load the wrong barrel with the steel - recipe for disaster to me - stick with lead mate Quote Link to comment Share on other sites More sharing options...
EdSolomons Posted August 15, 2011 Report Share Posted August 15, 2011 Yep what he said. Quote Link to comment Share on other sites More sharing options...
poontang Posted August 15, 2011 Report Share Posted August 15, 2011 having just bought a Miroku MK70 Sport o/u from this site I have been reding the booklet that came with it. The gun has fixed invector chokes - top barrel is 3/4 and the lower barrel is 1/4. Thanks Are you sure you've got an MK70? I thought they were multichoke guns The MK60's are fixed choke (1/4 and 3/4) and are generally a game gun. Quote Link to comment Share on other sites More sharing options...
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