zipdog Posted June 10, 2011 Report Share Posted June 10, 2011 Iv just ordered a ruger 77/17 which comes with a 24 inch barrel, i plan to put a lei sound mod on it which is 4 inches long, it this too long for shooting out of a vehicle? If so and i was to cut it down to 18 inchs would i get any change in velocity or accuracy. many thanks Quote Link to comment Share on other sites More sharing options...
dannywayoflife Posted June 10, 2011 Report Share Posted June 10, 2011 I'd say it would be way too long for my liking! I'm thinking of shortening my "18 Annie I don't know off the top of my head what the optimum length is for hmr. But as anshutz sell the 1517 at 14" I imagine that it's around that! Atb Danny Quote Link to comment Share on other sites More sharing options...
zipdog Posted June 10, 2011 Author Report Share Posted June 10, 2011 ok, is there any accuracy loss when you shorten ? thanks Quote Link to comment Share on other sites More sharing options...
Frenchieboy Posted June 10, 2011 Report Share Posted June 10, 2011 I had my CZ452 17HMR Varnint shortened from a 20 inch barrel to a 16 inch barrel and if anything it not only made it more "handlable" it also helped the accuracy! Quote Link to comment Share on other sites More sharing options...
Blunderbust Posted June 10, 2011 Report Share Posted June 10, 2011 You might lose a small amount of energy but I don't think it would make much difference out to the effective range of the HMR and I doubt it will deplete the accuracy. Quote Link to comment Share on other sites More sharing options...
Beardo Posted June 10, 2011 Report Share Posted June 10, 2011 16" seems like the best bet Quote Link to comment Share on other sites More sharing options...
Shropshire_Lad Posted June 10, 2011 Report Share Posted June 10, 2011 18-19" is said to be the best for hmr. I have a 16" CZ and can't fault it. atvb Paul. Quote Link to comment Share on other sites More sharing options...
dadioles Posted June 10, 2011 Report Share Posted June 10, 2011 18-19" is said to be the best for hmr. I have a 16" CZ and can't fault it. atvb Paul. I would not use the word "best" but that was the length which gave the maximum velocity although in practical terms it is really neither here nor there. I use the 14" Anschutz and really appreciate the short barrel. Accuracy and velocity just is not an issue. Broadly speaking, the shorter the better. I cannot see any advantage in longer barrels for day to day shooting. Quote Link to comment Share on other sites More sharing options...
Shropshire_Lad Posted June 10, 2011 Report Share Posted June 10, 2011 I would not use the word "best" but that was the length which gave the maximum velocity although in practical terms it is really neither here nor there. I use the 14" Anschutz and really appreciate the short barrel. Accuracy and velocity just is not an issue. Broadly speaking, the shorter the better. I cannot see any advantage in longer barrels for day to day shooting. trying to keep things simple, optimum may have been better. a few "'s either way is not realy going to make a lot of difference, all about being handy from where you shoot most. atvb Paul. Quote Link to comment Share on other sites More sharing options...
Vermincinerator Posted June 10, 2011 Report Share Posted June 10, 2011 I shortened my mates stainless 77/17 so that his over-barrel mod was about 1/2 an inch infront of the forend, cant remember the exact barrel length. There was no loss of accuracy and the rifle was so much more handy. Ian. Quote Link to comment Share on other sites More sharing options...
ballistic Posted June 10, 2011 Report Share Posted June 10, 2011 hi guys,new on here..i shortened my cz varmint 17hmr to 16'' with no noticiable results,still shoots as well as it did before the amputation.ideal now for pointing out the truck window. Quote Link to comment Share on other sites More sharing options...
cooter Posted June 12, 2011 Report Share Posted June 12, 2011 The difference between the 20 and 16 inch barrels is around 100fps. A shorter barrel will mean hotter gasses getting into the mod, which can reduce mod life, but a decent mod can handle it. My old shooting buddy and I were target shooting side by side, and he was using a 20" barrel, and there was nothing in it. Quote Link to comment Share on other sites More sharing options...
Dekers Posted June 12, 2011 Report Share Posted June 12, 2011 The difference between the 20 and 16 inch barrels is around 100fps. A shorter barrel will mean hotter gasses getting into the mod, which can reduce mod life, but a decent mod can handle it. My old shooting buddy and I were target shooting side by side, and he was using a 20" barrel, and there was nothing in it. I have spent a lot of time on ballistics historically, (unfortunately not much on HMR), and one area where people always appear to get lost is barrel length over speed. Commonly, the perception is that with a long barrel friction takes over after the propellant is exhausted and power (speed) loss ensues. This is not necessarily; actually it is rarely the case, (unless the barrel is silly long), the pressure does not stop in the barrel when the propellant is burnt out, and even though it is not so intense, there is still greater pressure than friction, hence why longer barrels will "almost" always produce faster bullets, long after the propellant is burnt! Someone quoted 18-19" as the Best HMR length, can you give me some reference to the physics/maths that leads to this suggestion. Cheers! Quote Link to comment Share on other sites More sharing options...
Beardo Posted June 12, 2011 Report Share Posted June 12, 2011 I'm sure in terms of velocity this is true, but practicality must also influence, hence lopping it back to 16", it's going to be slightly slower, slightly more mod wear but easier to point around especially from a motor Quote Link to comment Share on other sites More sharing options...
dadioles Posted June 12, 2011 Report Share Posted June 12, 2011 I have spent a lot of time on ballistics historically, (unfortunately not much on HMR), and one area where people always appear to get lost is barrel length over speed. Commonly, the perception is that with a long barrel friction takes over after the propellant is exhausted and power (speed) loss ensues. This is not necessarily; actually it is rarely the case, (unless the barrel is silly long), the pressure does not stop in the barrel when the propellant is burnt out, and even though it is not so intense, there is still greater pressure than friction, hence why longer barrels will "almost" always produce faster bullets, long after the propellant is burnt! Someone quoted 18-19" as the Best HMR length, can you give me some reference to the physics/maths that leads to this suggestion. Cheers! One piece of research that I have taken note of in the past is this one by Bullberry Barrel Works where they progressively cut down a barrel and 19" gave the highest velocity. Their web page is here http://www.bullberry.com/HMRdata.html Quote Link to comment Share on other sites More sharing options...
willybomber1 Posted June 12, 2011 Report Share Posted June 12, 2011 My CZ452 american is cut and threaded at 16". It is still very accurate, light enough to carry round when walking and pointable enough when shooting from a 4x4. Nuff said really. Quote Link to comment Share on other sites More sharing options...
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