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Yes, as I recall, Rick Jamison did a write-up on the mini-30, approx 30 yrs ago. For one of the gun magazines ( I think it was Shooting Times) At that time, he reported that the barrel of the Ruger had a bore of .311 at the chamber tapering to .308 at the muzzle. Ruger did this in the early mini -30's because at the time, .311 cal hunting legal bullets in 7.62x39 in the 120-130 gr. weight range were not available, as components, or manufactured ammo. .308 bullets were readily available in this weight range. Since Ruger marketed their Mini 30 as a Brush gun for Deer hunting, this was an important consideration.

As to Barrel twist rate, the mini 30 is 1 in 10". The person you talked to was incorrect, but some of the .223 mini 14s in that time frame had a 1 in 7" twist rate.

So, do some experimenting with your reloads. .308 and .310 cal bullets would both be safe to use in your early mini-30. Hornady makes bullets in both calibers. Best wishes, and please report back too us your shooting results!!
 

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Not an answer to your question but I had an early mini ,30 shortly after they came out. Had a scope on it and was into reloading at the time. I never did find a combination that was half way accurate. I had a couple mini 14's before that and while they were never known for outstanding accuracy, they were both a lot better than that mini 30. Recently watched a hikok 45 video on YouTube where he was shooting the 30 and it appeared to be more accurate than the one I had.
The New ones are better. Except they still don't shoot steel well, without a new firing pin from firingpins.com
 
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