The 5 shot group requires a 1/4 MOA gun. Even expensive custom guns do not guarantee that. see this
custom gun maker, only guanrantee 3 shots group 1/4 MOA, and you must use his $4 USD custom ammo.
A consistent 1 MOA gun would get you 18 points, that is pretty good if you can do it in 500. Load development is time consuming and costly. There is a good reason why most people (who have jobs) do not bother do load development unless the gun is worth it in the first place.
Regarding your last point. I suppose people have differing views on whether
"guns shoot like arse" - "can be made to shoot". I am not so convinced. Most cheap and inaccurate guns are inherently inaccurate. While you can improve certain aspects to make it shoot a little better such as bedding and re-crowning. You cannot do anything about most aspects of the gun that made it inaccurate, such as -
* lower quality materials used for the action and barrel,
* low quality bore and rifling resulting from low quality craftsmanship and tools,
* imprecision of stamped actions,
* thinly made actions that have higher amount of flex,
* cheaply joined barrel and action (I remember reading reviews about one Remington rifle which had the barrel pressed into the action),
* off-centre action and barrel resulting from excess tolerance,
* excess tolerance in the headspace, and
* triggers designed/made to have 6-pound pull with a 3/4 inch of creep and no clear or consistent point of let-off.
And we are not even talking about rifling wear, fouling, pitting, rust and physical damage that comes with age.
(~awaits for someone to tell me that they got a beautiful xxx rifle from 1939 which had stamped action and pressed pencil barrel that had gone through WWII but still shoots like a laser)
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