I think you're on the right track / and it sounds to me like you're getting about the best you can expect out of a Glock model 34 ( not that its bad / it is what it is ) .....
Montana Gold bullets, in my opinion, are very consistent and high quality - so they are not the problem in my opinion. I also use TiteGroup and find it a very good powder, very consistent metering - and I use it in a number of calibers including 9mm, .40S&W and .45 acp ...with very good results.
There are handguns on the market that will guarantee you a 1" group at 25 yards ( Wilson Combat 1911's / Sig X-Five ...) but they are all way above the price point for any of the Glocks - and they will provide a test target with your gun to prove it ....but it means dipping into your check book for the better part of $3,000 or more these days .....
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