Sorry to hijack the thread but...I had thought of going the .243 route when I was building a rifle last year but wanted something with a little longer barrel life. My .257 Roberts AI pushes 75gr V-Max over 3700fps with ease and should last a life time. I've only shot one coyote with it so far but it messed it up pretty good.
6X47L vs 6XC vs 6BR ???
- Thread starter dawgmaster
- Start date
Sorry to hijack the thread but...I had thought of going the .243 route when I was building a rifle last year but wanted something with a little longer barrel life. My .257 Roberts AI pushes 75gr V-Max over 3700fps with ease and should last a life time. I've only shot one coyote with it so far but it messed it up pretty good.
Long, go on the Berger website then to ballistic info. Assuming you're starting them both
at 3000fps they're identical with the only difference being the energy at the far end.
Pretty good info there. A friend of mine in Texas shoots on the US National F-class team
and they use the Berger site.
at 3000fps they're identical with the only difference being the energy at the far end.
Pretty good info there. A friend of mine in Texas shoots on the US National F-class team
and they use the Berger site.
prep'd brass doesnt make one calibre better then another
Realitically, even if the brass prep'ing did help to tighten that 5 shot shot group there's a select few shooters who either own the benchrest tools or have the benchrest capabilites to see an improvement in the grouping.
Realitically, even if the brass prep'ing did help to tighten that 5 shot shot group there's a select few shooters who either own the benchrest tools or have the benchrest capabilites to see an improvement in the grouping.
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- Location
- Saskatchewan
Well seeing as I started the thread, and we have ventured off topic anways and I thinkd I have decided to just stick with the 6AI...here is a couple questions for you knowledgable guys...longshot made comment about the benefit of extra velocity...so if you have a two loads that shoot equally well at 100 are you best to go with the hotter of the two and let's just say the hotter load is two grains more then the other load and say 150ish fps faster...how much harder will that load be on barrel life????
I would never choose a load based on 100 yard performance. You need to shoot them at longer distances to see the long distance potential. If they shot equally well at 300 yards, I would choose the one with the least wind drift at 1000 yards. That is based on the velocity AND the ballistic coeficient, not velocity alone. A quick JBM simulation using a Litz derived NC and the velocities each load is running at will tell you this accurately.
Actually if you were to read about this on 6br very few change their 100 yd load for 1000
The basic reasoning is that reading conditions is the biggest factor. Having a 1/4 inch
load at 100 doesn't mean much if you have a 7 ft drift at 1000. Being consistent in
everything you do is probably the main thing.
The basic reasoning is that reading conditions is the biggest factor. Having a 1/4 inch
load at 100 doesn't mean much if you have a 7 ft drift at 1000. Being consistent in
everything you do is probably the main thing.
barrel life
Barrel life is dependant on the amoount of heat created by individual shots.
This will vary from calibre to calibre and the individual loads.
Best policy is to to not let any barrel get beyond the warm level.
If the barrel is "hot" you could potentially hurt it in a short time.
I've read where benchrest shooters bring a cooler of iced towels which are laid on top the barrel to maintain a cool or warm temperature
Barrel life is dependant on the amoount of heat created by individual shots.
This will vary from calibre to calibre and the individual loads.
Best policy is to to not let any barrel get beyond the warm level.
If the barrel is "hot" you could potentially hurt it in a short time.
I've read where benchrest shooters bring a cooler of iced towels which are laid on top the barrel to maintain a cool or warm temperature
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Or you could go out and try it for yourself, as some of us have many times over.
There is no correlation between wind drift and group size. It doesn't matter how much your bullet drifts if the wind is constant. It's changes in the wind that gets you.
Dawg, your going to have to figure out a few things. Like Komb said 100m isn't really enough to get a good idea about your loads. Some shoot very well at 100 but fall apart at longer distances. Sometimes they shoot like crap at 100 but settle right down farther out.
If I had two accurate loads with the same bullet and one got me another 200fps I'd definately look at that one over the slower. More velocity is going to have good effect on the wind if you can read it. If you cant read it 500fps more isn't going to help a stitch. Does more velocity mean shorter barrel life? Possibly. Depends on what your idea of accuracy is. A benchrester or F class shooter might "burn out" a barrel to a degree where its not good enough for their purposes in 800 rds. That same rifle in the hands of a tactical shooter might have acceptable accuracy for 2800 rds. All depends on what your standards are.
If I had two accurate loads with the same bullet and one got me another 200fps I'd definately look at that one over the slower. More velocity is going to have good effect on the wind if you can read it. If you cant read it 500fps more isn't going to help a stitch. Does more velocity mean shorter barrel life? Possibly. Depends on what your idea of accuracy is. A benchrester or F class shooter might "burn out" a barrel to a degree where its not good enough for their purposes in 800 rds. That same rifle in the hands of a tactical shooter might have acceptable accuracy for 2800 rds. All depends on what your standards are.
- Location
- Saskatchewan
Thanks guys...I went with the hotter load, for now anyhow, and in two trips out it shoots slightly over moa at 1000. The only practical thing to do would be to try the other load now at a 1000! But again, wind conditions on just one trip out maybe my difference! I am pretty pleased with this load so far...good velocity and no signs of pressure. So practise time! Thanks again for the input!
