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CZinZA

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Posts posted by CZinZA

    Steve P.

    in Range Diary

    Posted

    I suck at this sport.

    That is all.

    OK - not quite all. Here is a video of probably my best stage from yesterday's level 2 IPSC match. 15 Alphas, 2 Charlies & 1 Delta in 21,51 seconds. Unfortunately it was pulled from the results because the last few targets were upside down.

    Usually I shoot too many make-up shots (although I typically shoot 90-93% of the available score) and I'm very very slow....

    TS Orange compared to Shadow 2

    in CZ

    Posted

    TS Orange is an upgraded TS - made for IPSC standard division and meant to be bought in .40 for major

    The shadow 2 is a new shadow, based on the SP01 service pistol and designed for production division in 9mm.

    They are completely different guns - although there is also an upgraded Orange version of the original 9mm shadow as well

    Sent by Jedi mind control

    At what point in the firing process does the slide start to cycle ?

    in 1911-style Pistols

    Posted

    CZ, you are quite wrong. 5% is not nearly enough to account for it being necessary to drop 7lb in recoil spring strength to get the slide to operate in the example I gave above.

    If you look at the formula for recoil, you will find that the powder weight is multiplied by 4700 before being squared. So it isn't 4 gr, or 0.0006 lb that is added to muzzle velocity times bullet weight squared. It is 0.0006 * 4700 =2.6857 squared, or 7.2131 lbs that is added in that section of the formula.

    So what you are considering as the effect of powder weight (0.0006 lb) is actually 1202.1769 times too small.

    I don't know this formula for recoil that you're referring to.

    Recoil is caused by conservation of momentum. The momentum of the gun moving back is equal to the momentum of the gas and the bullet moving forward. If both gas and bullet leave the barrel at the same velocity then their contribution to momentum is in the same proportion as their masses. Since the gas weighs less than 5% what the bullet weighs, its contribution is small.

    Sent by Jedi mind control

    At what point in the firing process does the slide start to cycle ?

    in 1911-style Pistols

    Posted

    There should be a slight rearward bias to the recoil forces when the pistol is fired. The lugs are still engaged at this point, so there is no rearward movement of the barrel or slide. Once the bullet leaves the barrel, the balancing forces are gone. A large part of the recoil is actually the jet of gasses exiting the front of the barrel. Without them, action of the slide would be anemic.

    Consider this. Take a 185gr JHP @ 775fps 50 yard bullseye load. Fire it in a 1911 with a 13 or 14lb recoil spring and everything works normally. There is recoil. The slide operates normally, ejects the empty casing and loads a new round.

    Now keep everything the same except use a comp'd barrel. When you fire, there is a little bit of recoil straight back, but no upward rotation of the gun. The slide does not budge. Why? There is very little gas jetting out of the front of the comp. You would have to go down from a 14 to a 7lb recoil spring to get the action to cycle. Even then, the weak spring has problems stripping the next round.

    Unfortunately the science is not quite right. The bullet weighs more than 100 grains and the ejected gas only about 4 grains (since its equal to the powder plus some oxygen). Since we are talking about conservation of momentum, which is directly proportional to mass, its easy to see that the gases probably contribute 5% to the recoil at most.

    The comp doesn't work by stopping the gas going forward. It works by jetting the gas upwards, thus producing a force that counteracts the upwards component of recoil

    Sent by Jedi mind control

    CZ TS Orange

    in CZ

    Posted

    Hello from Greece.

    I am a happy owner of a CZ 75 TS ORANGE. It's my first .40 caliber and ,after 2 months of contact , i love it .

    But i have some FTF (Failure to Feed ) and i am afraid that the problem is the plastic buffer.

    My OAL is 28.8-28.9 mm and my magazines run 18 rounds with factory springs and 5mm cutted legs from the followers.

    I like the feeling of the recoil with the buffer and i wand it .

    So , as i read in other threads

    (http://www.brianenos.com/forums/index.php?showtopic=201948)

    i can "stroke" the slide to give room for the buffer.

    This mean that i must cut the slide like this?

    kapa%20mantel.jpg

    Is it safe ?

    Thank you.

    Manolis

    I would not do anything that drastic without trying simpler solutions first. I load to 28,8 mm as well and I've run through 25 000 rounds without a single malfunction. I always use a buffer. There may be issues with the modified magazines. Alternatively you can change the length (up or down) by maybe 0,5 to 1 mm to see if it makes a difference. There should be no need to make an irreversible change to a TS with a hacksaw. .....

    Sent by Jedi mind control

    Aging Eyes

    in Tips for Improvement

    Posted

    Awhile back my eye dr had me try mono vision and I couldn't adapt. But it's getting harder to see the front sight. For grins I shot a few rounds using my readers (+1.5), and while the target was fuzzy I shot better with a sharp front sight.

    Has anyone tried full lens reader safety glasses? For the price I'd like to try these http://www.amazon.com/gp/aw/d/B00KSJQC8W/ref=mp_s_a_1_7qid=1462048355&sr=8-7π=AC_SX236_SY340_QL65&keywords=full+reader+safety+glasses&dpPl=1&dpID=31sIHB9KiwL&ref=plSrch

    If it works I'd drop the coin for lenses that fit my shooting eye pro. I'm just thinking it might be a cheap way to try it.

    I use those and i think they're fantastic. But i use the +0,5 strength. It's enough to make my front sight crystal clear but i can still see the targets clearly

    Sent by Jedi mind control

    chuck petree journeyback to shooting

    in Range Diary

    Posted

    The pain and embarrassment are good. They will drive you to make sure you never do it again. Nobody was hurt and you'll be a better shooter for having gone through this self-inflicted lesson. (Although it feels pretty crummy at the time of course)

    Sent by Jedi mind control

    Ambidextrous shooters?

    in Handgun Techniques

    Posted · Edited by CZinZA

    In my opinion, someone who can shoot equally well with either hand dominant is going to be better than the rest of us - for the reason you mentioned, that sometimes a course is better for a left or right hander.

    But whether it is a good use of time to develop such a skill, versus training to improve some other aspect of your shooting - well that is a different story

    Sent by Jedi mind control

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