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VarmLR

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About VarmLR

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    http://www.referencefidelitycomponents.co.uk

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    Gloucester
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  1. VarmLR

    6.5 re-barrel options

    As the others have said, as you have the dies etc for a 47, that's the one I'd stick with. If starting from scratch, the CM has a little more versatility with bullet weights. I'm not sure what the match guys' experience is with accuracy comparisons between the two (has any direct testing been done by anyone?) but I'd be surprised if there were anything in it. The whole point of CM development was to produce an inherently accurate and efficient case design, and it does seem to deliver good results. I've been following the debate on 6.5 cal bullet weights and looking at one of the more popular bullets, the Scenar, which weight is best I think may be down to the barrel length. Longer barrels may suit the heavier slightly higher BC bullet better where it can max on velocities. I'm about to try the 123gr variant as I think that the difference in BC may be eclipsed in my 24" barrel with the higher velocities that I ought to be able to run with the 123gr over the 139...we'll see. Common consensus from those who have tried it suggests that there's very little advantage to the 139 over the 123.
  2. VarmLR

    Brass

    Yes, they're perfect. Nice quality. You ought to get 10 or so reloads from those, perhaps a few more, before primer pockets start to loosen up. Best to anneal them every 3 or 4 firings if you can (just the necks).
  3. VarmLR

    6.5CM/RS62 Updates

    All mine are loaded 30 thou off and there is a fairly large sweet spot between 43.7 and 44.2gr where ES is lowest, so your results pretty much mirror my own findngs.
  4. VarmLR

    6.5CM/RS62 Updates

    First shot POI was very close. The barrel has gained some velocity with bedding in which is no big surprise. Temperature likely counts for most of the observed velocity gains the other day. Bullets were kept in the shade where ambient temp was about 22 degrees. I am not really trying to achieve anything....just noting and sharing outputs from SR brass loads for comparison with LR brass. Velocities are on the nail for the purposes but not being reached as efficiently as for LR brass loads which I will be returning to and sticking with when this brass batch is done. For the moment, accuracy is very good, the app has been calibrated with observed shot data over a wide temperature and distance range so the app data for the bullet is now on the nail.
  5. VarmLR

    6.5CM/RS62 Updates

    I don't quite see the logic there as RS 62 is single base (unless comparative load results are for way less charge using RS60), lower energy and the conclusion is that reverting to LR brass and RS62 will give more than adequate velocity for what is a very slippery bullet. 43gr of RS62 in LR brass is not that stiff a load. Most of my shooting is sub 700 yds with perhaps once monthly incursions to 1000 and at that range I have no problems with accuracy using that powder...it's one of the most accurate load combinations that I've shot in fact. I guess the point is that I can't really see much benefit in using SR brass but am quite happy using RS62.
  6. VarmLR

    rebarrel time

    Very nice. Is that an IOR Recon sat atop?
  7. VarmLR

    6.5CM/RS62 Updates

    I thought it might be of interest to those dipping their toes into 6.5CM to share ongoing data. I have now put around 400 rounds through the TAC A1 and the barrel seems to have gained velocity quite considerably over new, with velocities checked every 100 rounds. I have also logged chrony'd velocities with temperature all with the same load. Results as follows: 139 Scenar, 44gr RS62/SR Lapua brass/Murom KVB223 Magnum: 10shot strings. New barrel/fresh brass/5 degrees C 2633fps 31ES/SD10 (not good on any level) 200 Rounds/1F brass/10 degrees 2650fps 16ES/SD9 350 Rounds/1F brass/22 degrees 2701fps 15ES/SD6 400 Rounds/1F brass/24 degrees 2707fps 15ES/SD5.8 I haven't batched bullets or brass and haven't loaded to any greater tolerance than 0.1gr so the stats are respectable enough but can be improved to get everything into single figures with a little more care. Temp sensitivity appears to be 4 to 5fps/degree which is a surprise as I had reckoned this powder to be less temp sensitive than viht,; however, how much of the velocity increase is due to the barrel speeding up with bedding in and how much is temperature related is a moot point so probably not worth drawing too many conclusions. Incidental comparisons with a shooting colleague using LR primers in 6.5 gave 100 fps more (24 degrees C) for almost 1 full grain less powder (same barrel length). The trade off using SR brass is longer brass life but less velocity potential. I was shooting 100% fill ratio loads so 2700fps seems to be the limit with SR brass in my rifle with RS62. I could seat out another 20 thou and compress loads slightly and probably make 2750 to 2800fps max. but it isn't worth going to extremes for the pressure rise. I will update this post further when I have another hundred or so rounds through the barrel just to double check that the increases have been more related to barrel bedding than temperature issues but my own conclusions are that for the ES/SD I'm achieving, it is not worth going to SR brass for CM when many people now seem to get 10 or more reloads from good quality LR brass for less powder used and similar SD results.
  8. VarmLR

    Rebarrel from 223 to 204

    I was being polite. Take your personal comments elsewhere.
  9. VarmLR

    Rebarrel from 223 to 204

    All of which goes to demonstrate that the .204 in reality has no significant advantage over a .223 in terms of scrutinising numbers for realistic shooting distances. If you want to shoot precision, in the wind at 600, pick a more suitable calibre. In terms of velocities, it seems pretty widely known that claimed speeds (ie those not chronographed by the shooter) where .204 is concerned are often over-egged or not representative of what to expect with a typcal 20 inch tube. It's a bit of a well worn and tired argument. Personally, I think worrying about accuracy and bullet selection is way more important than endless debates over trajectory. Once out beyond 100 yards on small quarry, nothing is laser-like and you have to hold off or dial for everything so shooters reading this may be better advised to find out with some precision (and that doesn't mean from exclusive use of drop charts derived from ballistic apps) their actual drops and then practice for holding off for wind etc. Developing accurate drop charts based on your chosen round is frankly more important than agonising over calibre comparisons...all imho of course. Otherwise pick what you fancy or like shooting. End result is practice makes perfect.
  10. VarmLR

    Rebarrel from 223 to 204

    You can't have both "flat shooting" and "little energy". The point about higher velocities besides suffering less wind drift (form factor and BC dependant) and drop, they make for more efficient kills through hydraulic shock, A safe shot is a safe shot so this whole business about bullets carrying with high energy points towards an assumption of no safe backstop. So no, there is no argument for limiting velocities other than where a worked up load proves more accurate at lower velocities. Limiting the carrying of energy is the sort of comment I'd expect from an inexperienced FEO, not a shooter.
  11. VarmLR

    Font Colour

    Loads better.
  12. VarmLR

    Font Colour

    That as well.....LoL.... You know you're getting old when you can't remember Pink Floyd track names.
  13. VarmLR

    Rebarrel from 223 to 204

    That seems about the size of it. I can get close on .204 velocities with 40 to 50grn bullets in my .223 (up to 3500fps) but use a slightly longer barrel than the modern norm. I prefer using heaver higher BC bullets. If you limit your shooting to 300 yards, there really doesn't seem to be a lot of difference or advantage of one cal over the other, the .223 retaining greater versatility imho.
  14. I get the same thing so simply cut my patches down until you don't need the strength of a silver-back gorilla to push them through which also increases the chances of bowing the rod, (bore guide or not,)and makes it easier to control the rod near the crown. I use Pro-shot stainless and Tipton Carbon rods. Pro-shot are more rigid and my preferred cleaning rod.
  15. VarmLR

    Font Colour

    Psychedelic man....it makes me want to spin up Piper at the Gates of Dawn...Intergalactic Overdrive
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