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> Precision long range hunting and shooting
> Maximum point blank range
Maximum point blank range
@ 02:39 pm (GMT) |
KenneyAn interesting topic to bring up in the world of rangefinders and dial up scopes but the knowledge base on this forum is better than any other so I'm going to. A bit of background, I have a ruger hawkeye in .308 that I have been trying to accurise, after working through a few things with Nathan's guidance the final option was to rebarrel, I ended up with a truflite 1:11 twist 20" and slightly beefier contour, still in .308. I refurbished a second hand walnut stock and have topped it off with an old leupold m8 4x scope. Not exactly a long range rig but as they say horses for courses. I wanted a general purpose rifle that was simple, a pleasure to use, could bush hunt target shoot or use to my own personal effective range, it also looks perfectly balanced to me and I hope it stays in my family for generations. Must post photos at some stage. Any way I am curious to know what you think of sighting in for MPBR and going from there, I have sort of done this already but want to make sure I'm on the right track, I think it will be a good combination, considering the fixed power scope with friction adjustments and lack of rangefinder. I'm currently using remmington corelokt 150gn and don't hand load (yet). Rifle is grouping around an inch with this load. Target species is red deer for the most part. I am figuring a vital zone radius of 3-3.5"? Should allow for field errors?Would be interested to see what you all think, Cheers |
Replies
@ 03:27 pm (GMT) |
chris murphyRe: Maximum point blank rangehi Kenney Ive shot a 7mm rm for the last 6-7 years and only in the last 3 got into dial up scopes and range finders now that my wallet allows it before that i had a standard 12 power scope. all i did was plug my load data into a calculator on the hornady site and play round with zero ranges till i got one that suited trajectory. i ended up with a 50yrd zero that put me .5" hight at 100, zero again at 150, 1.7 low at 200, 8.7 at 300 and 21" low at 400 which worked out well with the top of the post (that was long range for me back then) i don't know the drop of the 150s in 308. but i was using 160 AB at 3050. Nathan will have some better ideas but hope this helps. |
@ 03:35 pm (GMT) |
Bob MavinRe: Maximum point blank rangeG:day KenneyI had a similar 308, Sighted 3” H @ 100m it was 3” L @ 250m about 9” L @ 300m with factory 150gn Remington core-lock. I shot a lot of game with that pill including Samba & Red’s Cheers Bob |
@ 04:28 pm (GMT) |
Nathan FosterRe: Maximum point blank rangeHi Kenney, one thing Bob neglected to mention was that he is quite a good shot and by using forwards shoulder shot placement (autonomic plexus), he can tip animals over out to these ranges.For the less experienced or those hunting in adverse conditions, it is important to understand that the .308 Core-Lokt loads have very poor BC's and often fail to generate a great deal of velocity. Once the load goes past 150 yards or so, it loses a good deal of energy. Shot placement becomes important once we start stepping out past 100 yards. If you could choose a more aerodynamic load, that would be great (eg 165gr SST). Hand loading would be even better. Why not put some funds aside each week till Xmas. My book will be out then and it will have a shopping list that will help save you money- maximum milk for minimum moo. But for now, if you could try a more aerodynamic factory load, I think this may suit you as I get the feeling you do want to push ranges ridge to ridge. If you want to use the Core-Lokt, by all means do so. But you need to practice shooting and study wind drift as this will be your enemy as you reach out. The Core-Lokt is well under 2000fps by the time it reaches 300 yards from true MV's of around 2750fps and has limited wounding potential at such velocities if ity does not strike the forwards chest. The Core-Lokt is a very good bullet, but like all bullets it has its limits. A general rule is, sight 3" high at 100 yards, zero around 250 yards, then 6" low at 300 yards, 9" low at 325 yards, 12" low at 350 yards, 16" low at 375 yards and 21" low at 400 yards. Pretty much as Bob said and this basic rule can be used across several brands of ammo and hand loads (150-165gr) without any huge variation. Sorry Bob- I just want to make sure all of this is clearly understood. |
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@ 12:04 am (GMT) |
Bob MavinRe: Maximum point blank rangeNo problem Nathan, I agree. I really like the Remington core-lokt projectile in a 308win, but, 275-300yds is my maximum. |
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@ 04:20 pm (GMT) |
Kenney CrockettRe: Maximum point blank rangeSome good points there guys, the decision to use the corelokt was simple, I had a bunch of it and a bunch of winchester superx, the corelokt was more accurate, not because I'm part of some corelokt fan club or anything. Can't wait for the reloading book nathan, should be a big help. Is a bullet with a higher BC less affected by wind because of the BC or because it is able to travel faster due to the higher BC, or a combination? Not sure if that question makes sense. My current personal limit is about 230yards and I have been doing a lot if practice in field conditions, it's amazing how that can really change things, considering a lot of guys sight in on the bench shoot tiny groups and then think they can shoot game out to x range because the ballistic software says so. |
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@ 05:15 pm (GMT) |
Bob MavinRe: Maximum point blank rangeG’day KenneyCore-Lokts will work well out to your 230yds max. On a good rest I use them out 300yds, they’ve lost their oomph by then. My take on wind & BC is!!!! The higher BC bullet retain velocity from less drag so it get there quicker with less drop and a less amount of time for wind to affect it. I think two projectiles of the same weight are affected by wind the same amount but the higher BC pill gets there quicker, as the lower BC pill slows down it gets blown off course more than the higher BC. Does that make sense? Bob |
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@ 06:05 pm (GMT) |
Kenney CrockettRe: Maximum point blank rangeThanks bob that was what I was leaning to when I was trying to work it out. |
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