dwight Posted February 25, 2008 Report Share Posted February 25, 2008 Hi there.I was thinking of getting a mod fitted to my cz 550 6.5x55.The mod i have my eye on extends past the muzzle by 4-5 inches.. Would it pay to get the barrel shortend by around 3 inches and would this proceedure affect the velocity..factory ammo is all i can use here in the republc of ireland. Any comments would be appreciated Rgds Dwight Link to comment Share on other sites More sharing options...
silentsoulsleave308holes Posted February 25, 2008 Report Share Posted February 25, 2008 factory ammo tends to be a little hot compared to reloading max info so the slight drop in speed may give you a little better accuracy if yaz lucky how long is your bbl now and what twist? Link to comment Share on other sites More sharing options...
Wsm Posted February 25, 2008 Report Share Posted February 25, 2008 Dwight You should only lose about 20-25fps per inch cutting your barrel down but the only real way to find out accurately is chronographing.Unless you`re shooting at distances greater than 300 yards I don`t think you`ll find that much difference.Most factory ammo is loaded hot anyway so its not like you`ll be on the operating on a light load All my stalking rifles are around 21"-22" and I`m happy with the performance on them.You might even find the shorter barrel combined with a mod makes it a wee bit more accurate Link to comment Share on other sites More sharing options...
Wsm Posted February 25, 2008 Report Share Posted February 25, 2008 Sorry Silent I was typing when you made your reply Link to comment Share on other sites More sharing options...
dwight Posted February 25, 2008 Author Report Share Posted February 25, 2008 factory ammo tends to be a little hot compared to reloading max info so the slight drop in speed may give you a little better accuracy if yaz lucky how long is your bbl now and what twist? Im pretty sure the twist is 1in 8.5..I will check on that.the barrel is 24 inch Link to comment Share on other sites More sharing options...
Wsm Posted February 25, 2008 Report Share Posted February 25, 2008 Both the CZ`s in 6.5x 55 I`ve seen have been 1:8.5 up to yet Link to comment Share on other sites More sharing options...
dwight Posted February 25, 2008 Author Report Share Posted February 25, 2008 All the CZ in 6.5x 55 I`ve seen have been 1:8.5 up to yet correct you are..Was just on there web site.. Link to comment Share on other sites More sharing options...
njc110381 Posted February 25, 2008 Report Share Posted February 25, 2008 24" is pretty long, I doubt 3" off it is going to hurt. Link to comment Share on other sites More sharing options...
silentsoulsleave308holes Posted February 25, 2008 Report Share Posted February 25, 2008 Sorry Silent I was typing when you made your reply they say great minds think alike.......you must be as dumb as a box of rocks like me then Link to comment Share on other sites More sharing options...
silentsoulsleave308holes Posted February 25, 2008 Report Share Posted February 25, 2008 gotta take the mrs shopping,,,,,,will be back in about an hour and will do the math then unless someone else does it before I do Link to comment Share on other sites More sharing options...
baldie Posted February 25, 2008 Report Share Posted February 25, 2008 I wouldn,t reduce it at all. There is a lot of powder in a swede, it doesn,t have a lot of effect on a bullet, when its burning in fresh air. Get some predicted figures from something like quickload, with the EXACT loads you intend using, then take it from there. You will lose more than 25fps per inch. Of course it doesn,t really matter, if you need a short range, woodland ride, Roe gun, but if you want to still take 300 yard shots at reds, or whatever, you need all the barrel you have. Swedes generally use slow burning powders, like vhit 160, or vhit 560 [actually developed specifically for it] and they still burnt some outside the barrel of my 28" alpine.That was with 139 grain scenars, and vhit 560. You cant glue it back on. Link to comment Share on other sites More sharing options...
Wsm Posted February 25, 2008 Report Share Posted February 25, 2008 Dave I was basing my info on my .243 which lost 70 fps less the 3" chopped off My 284 lost just over 120fps when going from 26" to 22 I know different cals have different characteristics but like I said if Dwight is shooting sub 200yds I personally wouldn`t worry about lobbing it down to 22ish I forgot to add that we tried to work out what the loss would be using a quickload program and it said we`d lose over 150fps off each but I was prepared lo lose that anyway.Turns out I didn`t have to though Link to comment Share on other sites More sharing options...
silentsoulsleave308holes Posted February 25, 2008 Report Share Posted February 25, 2008 av 69 fps loss Link to comment Share on other sites More sharing options...
Guest northernchris Posted February 25, 2008 Report Share Posted February 25, 2008 My .22-250 went from 3640fps with 25.5" barrel down to 3480fps when i shortened it to 20" I run my swede (202 Sauer) with a 20" tube with no "real world" loss of knockdown power The 1-8.5 twist likes 2680fps with 123gr Scenars and 2745fps with 139gr Scenars. Link to comment Share on other sites More sharing options...
baldie Posted February 25, 2008 Report Share Posted February 25, 2008 My .204 went from 4200 fps, at 26" to 3700 at 22". An expensive mistake.It still kills everything i want, but its not the point is it? The gun was designed for 4200 fps, and i stupidly castrated it. I always try and dissuade customers in the shop from doing the same to a 22-250, after all, why have a 22-250, that doesnt perform any better than a fast 223? Your getting better velocities with the 139 scenars, outa that 20" tube, than i was getting out of a 28" Chris...what powder are you using? I wasn,t running max loads however, but still got muzzle flash with the vv560. Link to comment Share on other sites More sharing options...
Guest northernchris Posted February 25, 2008 Report Share Posted February 25, 2008 Dave The load was 46.2gr of N160,Lapua case,CCI BR-2 139gr Scenar HARD in the lands.That was shot with A-Tec mod on over 2 different chrono,s.Interestingly i was getting 70-80fps MORE with the mod ON. The 3480fps from the short barrelled .22-250 is with 69gr Sierra match kings over a compressed load of N160 or N560!!!! so a wee bit more poke than "a fast .223" A few people on here have seen it performing oh and it works Link to comment Share on other sites More sharing options...
dwight Posted February 25, 2008 Author Report Share Posted February 25, 2008 Thanks guys.. I Think i`ll leave it be..Im more than happy with its performance as is...Was just curious what some thoughts were.. Regards Dwight Link to comment Share on other sites More sharing options...
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