Need a little help group. I started off using small eyelets as string guides. 1st stringing went fine once i moved to the Southbound Acoustic Light Gauge. Then I opted to remove the middle eyelet and run a small bolt thru the 2 eyelets so that I could better adjust string spacing.
Hi Jim, I saw your question on the main page section but did not know how to respond there, glad you posted here.
So....what Larry said is proberebly correct. Strings are gauged to work within a certain range of their intended tuning/pitch, eg: an high "E" string at say 12g will go lower of course but can become too loose and lack volume.
On the other hand it can go higher up to "G" or "A" for instance, but will break when trying to reach the next "E" which is in the next octave, the string is too thick to stretch that far.
I feel the string you are using as a high string is too thick so will break when too high above its intended pitch [what it says on the packet.] It could be breaking at the hole in the tuner post, sharp edge and excessive tension.
If you are tuning something like G2 D3 G3 and have a 25" scale you are pulling around 28 lbs tension on the high G string. That's not normally break tension, but is a good bit higher than you actually need.
As for tuning to the wrong octave, don't think it doesn't happen. I've done it more than once.
If you have a smart phone, you can download (free) a guitar tuner app that shows not only the note but the octave you're tuned to. Comes in handy for first time tuning.
Let us know hat you find.
Ooops, sorry to mislead you Jim, I must have misunderstood your post.
Checkout my guide to tuning your guitar - tuning to an octave above is the most common cause of string breakage in my experience. https://youtu.be/C-wfo51zAvc
Make sure your not over tuning the strings and check all places the string come into contact with(tuner holes, nut, retainers, bridge, stop tail/tremolo/ferrules) for any sharp edges or burrs.
Where are the strings breaking in relation to the guitar? Near the nut? Tuners? Bridge? that gives you a clue as where to look for sharp edges and burrs.
What are you using to tune your guitar?