snipers eye Posted January 15, 2014 Report Share Posted January 15, 2014 would a 20" barrel on a hmr deliver more stopping power at distance over a 16" barrel? Quote Link to comment Share on other sites More sharing options...
crowdie2013 Posted January 15, 2014 Report Share Posted January 15, 2014 I've read that the difference is negligible for the distances you'd be shooting normally. I'm on the look out for my 1st .17hmr and noticed the longer barrel is cheaper. Seems shorter barrel preferred for using out the car window but someone will know better than me and advise you Quote Link to comment Share on other sites More sharing options...
Good shot? Posted January 15, 2014 Report Share Posted January 15, 2014 I have read that all the available energy is expended well before 16" so as previous post there is nothing to be gained other than what you prefer for the use you require. Quote Link to comment Share on other sites More sharing options...
Catweazle Posted January 15, 2014 Report Share Posted January 15, 2014 There will be a difference, but it's very small. I bought a long barreled HMR because I hoped that someone would develop a new powder that would allow a long barrel to get extra from the cartridge - it didn't happen, so now I have an unweildy HMR. Quote Link to comment Share on other sites More sharing options...
snarepeg Posted January 15, 2014 Report Share Posted January 15, 2014 I have a 19inch savage varminter, soon to be shortened as its awkward to get out of the window and 95 percent of my shooting is out of the drivers door, go the 16inch way. John Quote Link to comment Share on other sites More sharing options...
dadioles Posted January 15, 2014 Report Share Posted January 15, 2014 "would a 20" barrel on a hmr deliver more stopping power at distance over a 16" barrel?" Absolutely not. In practical terms for the hunting that we do, barrel length will have no effect whatsoever on either accuracy or power. It can be argued that a longer barrel will actually slow the bullet down through friction as the powder is already expended. Just make your own mind up based on handling. Mine is a 14" Factory Anschutz. Don't forget to factor in the length and weight of a moderator. Quote Link to comment Share on other sites More sharing options...
zx10mike Posted January 15, 2014 Report Share Posted January 15, 2014 yep i have read that the last 2-4" would probably slow it down Quote Link to comment Share on other sites More sharing options...
r1steele Posted January 15, 2014 Report Share Posted January 15, 2014 It won't make any real world difference. My 16" 455 suits me perfectly. An article in Feb's Sporting Shooter has an HMR with a 22" barrel and it gets cut down in 2" increments until they eventually get it down to 12". Results 22" 2527 fps 20" 2481 fps 18" 2472 fps 16" 2451 fps 14" 2470 fps 12" 2405 fps No loss of accuracy either. Quote Link to comment Share on other sites More sharing options...
snipers eye Posted January 15, 2014 Author Report Share Posted January 15, 2014 thanks alot lads. Quote Link to comment Share on other sites More sharing options...
walt1980 Posted January 15, 2014 Report Share Posted January 15, 2014 Anschutz 1517 with 18" barrel and LEI mod, keeps the length down n not had any probs! Quote Link to comment Share on other sites More sharing options...
johnnythefox70 Posted January 15, 2014 Report Share Posted January 15, 2014 I got a thumbhole Cz452 16" varmint barrel wiv a s+b scope and its absolutely awesome! Quote Link to comment Share on other sites More sharing options...
Dekers Posted January 15, 2014 Report Share Posted January 15, 2014 (edited) From Varmint Al's 22 inch = 2517 fps, 103 fps spread21 inch = 2523 fps, 66 fps spread20 inch = 2515 fps, 86 fps spread19 inch = 2538 fps, 83 fps spread18 inch = 2522 fps, 41 fps spread17 inch = 2505 fps, 43 fps spread16 inch = 2492 fps, 53 fps spread15 inch = 2477 fps, 27 fps spread14 inch = 2432 fps, 70 fps spread13 inch = 2419 fps, 32 fps spread12 inch = 2387 fps, 57 fps spread11 inch = 2338 fps, 45 fps spread10 inch = 2276 fps, 45 fps spread Interesting to note that this suggests 19" as optimum! But the difference between a 20" and 16" is negligible. Edited January 15, 2014 by Dekers Quote Link to comment Share on other sites More sharing options...
kent Posted January 16, 2014 Report Share Posted January 16, 2014 would a 20" barrel on a hmr deliver more stopping power at distance over a 16" barrel? No, it will never make a difference to what is hit Quote Link to comment Share on other sites More sharing options...
Brad93 Posted January 16, 2014 Report Share Posted January 16, 2014 (edited) How is the 19" barrel optimum? Obviously it had the highest fps but surely it would be the 15" barrel as that has the most consistent fps spread which would give better accuracy? Edited January 16, 2014 by Brad93 Quote Link to comment Share on other sites More sharing options...
Whitebridges Posted January 16, 2014 Report Share Posted January 16, 2014 My Anschütz is in 14ins flavour and the stuff i've shot with it hasn't noticed any difference. Guns with short barrels are so so much easier to handle in a confined space like the front of a truck IMO. Quote Link to comment Share on other sites More sharing options...
wymberley Posted January 16, 2014 Report Share Posted January 16, 2014 As the calibre is utterly dependent upon velocity, the makers will not under-sell this point and will advertise accordingly. My 16" Anschutz measures the advertised 2550 round at 2560 so no loss. Quote Link to comment Share on other sites More sharing options...
silverhawk Posted January 16, 2014 Report Share Posted January 16, 2014 My cz was 20inch had it cut down to 16inch.no difference in accuracy Just much better to carry and shoot with Quote Link to comment Share on other sites More sharing options...
bullet boy Posted January 16, 2014 Report Share Posted January 16, 2014 I got the 16" barrel and my Dad got the 20" barrel versions of the CZ445 Thumbhole Varmint rifle-there's no real difference tbh only mine is more compact. Quote Link to comment Share on other sites More sharing options...
kent Posted January 16, 2014 Report Share Posted January 16, 2014 From Varmint Al's 22 inch = 2517 fps, 103 fps spread 21 inch = 2523 fps, 66 fps spread 20 inch = 2515 fps, 86 fps spread 19 inch = 2538 fps, 83 fps spread 18 inch = 2522 fps, 41 fps spread 17 inch = 2505 fps, 43 fps spread 16 inch = 2492 fps, 53 fps spread 15 inch = 2477 fps, 27 fps spread 14 inch = 2432 fps, 70 fps spread 13 inch = 2419 fps, 32 fps spread 12 inch = 2387 fps, 57 fps spread 11 inch = 2338 fps, 45 fps spread 10 inch = 2276 fps, 45 fps spread Interesting to note that this suggests 19" as optimum! But the difference between a 20" and 16" is negligible. Funny those figures interested me from the spread point of view. I should like to know how long those shot strings were over that chrono Quote Link to comment Share on other sites More sharing options...
snipers eye Posted January 16, 2014 Author Report Share Posted January 16, 2014 thanks again lads for all the replys,reason for my question was,i looking on the net into that subject,i read abit about 2 mates testing the 17grs on some metal plate,the they said that both fired at the plate, one round kept going through,the other round just made a good dent,they both had the same rifle model,mods,hornady 17gr,the only difference was barrel length,one had a 16",the other had 20", the lad with the 20" had all the rounds go through the plate,so i just thought a 20" barrel would have a bit more power,but you all seem to agree there is not really any difference,so thats fine by me,thanks. Quote Link to comment Share on other sites More sharing options...
izzypop Posted January 19, 2014 Report Share Posted January 19, 2014 Got a 16inch cz varmint brill going over crono wot it says on the box Quote Link to comment Share on other sites More sharing options...
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