Swiss Arms accuracy
- Thread starter KDX
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here is a thread speaking to the accuracy of the short barrelled versions
http://www.canadiangunnutz.com/forum/showthread.php?t=461795
The non-restricted come in two twists 1/10 1/7 my preference is the 1/7 as they shoot heavier grained bullets more accurately than the 1/10's shoot the lighter grained bullets. Mind you they are all accurate with the right ammo.
Well said, all I could add is I believe the 1:10 is optimal when using the 63gr. RUAG ammo. I could be wrong, but I seem to remember reading somewhere that they were designed to be used together.
Cheers
Correct the GP90 (Ruag 63gr) ammo was designed for the Swiss rifles. This is why even the sniper version is also in 1:10.
This is false.
It is very likely that people on average will find the 10 twists more accurate (especially at shorter ranges like 100-300m).
Regardless, shooting heavier bullets don't make guns more accurate, the bullets themselves tend to buck wind better at longer distances - giving them better performance on target the further the shooting - on average.
Edited to add:
Attached are a couple of photos from a Swiss postal shoot I participated in a few years back:
First 6 rounds were slow rate (centered) followed by 6 rounds rapid. All shot with the apparently inaccurate 10 twist. You know, cause ballistics experts say its so.
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I have a black special 1:7 and it will put a round through a Loonie open sighted no problem at a 100 metres. Quite likely one of the most accurate rifles I have ever fired.
You will love it. The first shot tells you everything. Smooth like butter and solid like a rock.
You will love it. The first shot tells you everything. Smooth like butter and solid like a rock.
op, You will be happier with a 1/7 twist, SAN did develop a sniper rifle with a 1/10 twist for accuracy using gp 90 a 63 gr projectiles. Quite honestly a 1/7 will bring you better overall range results with 68-75gr ammo. Than a 1/10 twist will with any ammo. Some claim this is false, but trust me, those opinions don't come from ballistics experts
1 in 10" rifles are the standard for Swiss service. The acceptance standard is (was) 10 shots with GP90 at 300m, all falling in an 11cm x 11cm square. GP90 uses a 63gr bullet and most would consider this to be a heavier bullet.
1 in 7" barrels are offered, primarily for use by countries using SS109 type ammo. The factory does not have an accuracy acceptance standard for these barrels (although one would expect comparable accuracy).
I have used SS109 type ammo ( C77) in SAN 1 in 10" barrels with excellent accuracy. My rifle stabilizes 77gr ammo, but accuracy is not impressive.
My recommendation is that unless you plan on using 75gr+ ammo in your rifle, a 1 in 10" barrel is probably your best bet. The 1 in 7" fans are driving demand for the faster twist barrels, but I have yet to see any truely superior results from them.
1 in 7" barrels are offered, primarily for use by countries using SS109 type ammo. The factory does not have an accuracy acceptance standard for these barrels (although one would expect comparable accuracy).
I have used SS109 type ammo ( C77) in SAN 1 in 10" barrels with excellent accuracy. My rifle stabilizes 77gr ammo, but accuracy is not impressive.
My recommendation is that unless you plan on using 75gr+ ammo in your rifle, a 1 in 10" barrel is probably your best bet. The 1 in 7" fans are driving demand for the faster twist barrels, but I have yet to see any truely superior results from them.
If you were to come out and shoot more
you would see some of the guys trying to get a bit more performance, at 400, 500 & 600 yards. The heavier, ie. 77 gr bullets seem to do well, and the 1-7" barrels eat that up. I don't think (and haven't done that much for personal testing) that the 1-10" may not provide a noticeable benefit at those ranges. I'm of the understanding that the Swiss standard, and most ofter used distance, is 300m. And the "SS109ish" bullets will do well out to that range.
For those of us who shoot a nipple sized group at 2000 yds, we are always looking for the added 'edge' (OK not so funny pun intended).
BTW, I hope you noticed the dig at getting ur azz out to shoot more.
If you were to come out and shoot more
I'm of the understanding that the Swiss standard, and most ofter used distance, is 300m. And the "SS109ish" bullets will do well out to that range.
For those of us who shoot a nipple sized group at 2000 yds, we are always looking for the added 'edge' (OK not so funny pun intended).
BTW, I hope you noticed the dig at getting ur azz out to shoot more.
While that may be true I would bet you are in the small minority. I think the majority of shooters are using their rifles at sub 300m and are shooting primarily 55gr and some 62/63gr. For these people 1:10 would be a better choice (imo).
If you were to come out and shoot more
I'm of the understanding that the Swiss standard, and most ofter used distance, is 300m. And the "SS109ish" bullets will do well out to that range.
For those of us who shoot a nipple sized group at 2000 yds, we are always looking for the added 'edge' (OK not so funny pun intended).
BTW, I hope you noticed the dig at getting ur azz out to shoot more.
OK, dig noted! I have done quite well at 500m with C77 ammo, but I guess I need to get out a few more times so that someone else notices
You must have far better eyes than me. Without a scope I can't even see a loonie at 100 meters and I had laser eye surgury a year ago.
