NB might well have taught SC to use weapons responsibly from an early age. We have no idea if SC was familiarised further with firearms via school friends and/or the farm hand she had a relationship with.
SC didn't need to be familiar with the new Anshutz per se to load the magazine, attach it, chamber a round, aim and fire.
The pathologist described SC as well nourished and healthy.
Young mothers develop upper body strength from lifting and carrying children and various equipment eg buggies etc. SC was capable of fine motor movement as evidenced by her shaped eyebrows, manicured and varnished nails and applying full face make-up.
To doubt a women's ability to use a firearm is sexist. It is like me doubting a man's ability to hoover. 
She didn't need to know how to load the gun and chamber a round to be able to use it? That is perhaps the dumbest thing you have ever written on this this site.
You are demonstrating how ridiculously biased and irrational you are being. You have to be very desperate to ignore something that basic and dismiss its significance.
Sheila's family said that she had no interest in learning about weapons. Far form being a sexist comment it is reality that fathers taught sons how to shoot not daughters and that in boy schools shooting was taught but girls in school were not taught. This is not posters being sexist but rather being rational, objective and facing evidence. You don't want to face evidence you want to just ignore and dismiss anything that challenges you.
At any rate even if her father forced her to learn about weapons he did not own any semi-automatics so could not have taught her how to use semiautomatics when young. The first semi-auto he ever purchased was not purchased until the end of November 1984 and was purchased at Jeremy's insitience and purchased for Jeremy. he is the one who wanted a semi-auto. Why was he so desperate to have a semi-auto? Quite obviously so that the murders he planned to commit with it would go more smoothly.
SInce it was the first semi-auto, even if Sheial were taught how to load and use a shotgun when young that would not enable her to know how to load and operate the murder weapons because they loaded and operated differently. Ther eis no detachable magazine for a shotgun it is organic to the weapon. There is no need to chamber a round manually first for the shotguns they possessed either. Sheila would thus have no idea that a round even needed to be manually chmabered first let alone know how to do so.
This was pointed out to you multiple times in the past. Your silly way of dealing with it is to claim well who cares she would be able to use any weapon in the world by being trained when young how to use a shotgun even if they load and operate differently. I posted you an article about Lynette Fromme who grew up around shotgun and rifle use when she was young. She tried to shoot US President Ford with a semi-aut handgun but didn't know it needed to have a round manually chambered first and thus the gun didn't fire and she was disarmed without doing any damage.
That is what would have happened to SHeila if she grabbed the weapon, figured out how to insert a magazine and then held it on her father. It woudl nto have fired and he woudl have been able to disarm her.
You ignore this because it is inconvenient to what you decided you want to believe in spite of the evidence. You just dismiss it without any rational basis and make the ridiculous claim itdoesn't matter she didn't know how to load it or chamber a round. It doesn't matter to you because you don't care about the truth but rather what you choose to believe happened in spite of the evidence. To peopel who care about facts, evidence and what relaly happened it is a big deal and matters a great deal.
The issue of her poor hand eye coordination and the side effects of her medicne which woudl cause her to have tremors and inhibit her effective use of firearms is not sexists and has nothign to do with her gender. It has to do with evidence that she had bad hand eye coordination and dexterity issues. You choose to ignore this liek you ignore all evidence and when people bring it up you simply dismiss it's significance as you dismiss anything that detracts from your position. Dismissing it doesn't make it go away. It must be refuted to go away and dissmissing it doesn't refute it.