Yes, Digby, I'm sure the Russians are going to put in writing that they can't hit a bull in the butt with a bass fiddle when it comes to artillery and let everyone else know about it. The Russian armed forces, as well as their governments, are traditionally that open-handed about their internal problems. Russia has always been an open book to the West.
If you have read what I've written formally about the Russian artillery of the period and not just having to answer or discuss particular questions on the forum you might notice that I found the Russians to be quite interested in improving their artillery arm, though they were behind the British, French, and Austrians during 1792-1815. I made the statement that it was the most improved artillery arm of the period. Officer education was lacking, and both French emigre General Langeron and Sir Robert Wilson agreed on that point. Realistic artillery training was almost nonexistent at the beginning of the period and while great improvements were made with the System of 1805, carriage designs were of the older Prussian and Austrian type, the elevantion mechanism was copied from the Austrians and Prussians, and the sights developed were neither as simple nor as effictive as the French elevator sight. Russian gunnery has never been known for its accuracy, but it has been known for its mass. For example, the Russians massed at least 170 guns against Augereau's VII Corps at Eylau. Their bombardment of Soult's IV Corps caused casualties mainly because there was so much of it. Boulart, a Guard artilleryman, mentions the inaccuracy of Russian artillery fire.
Historical inquiry does require you to draw conclusions based on the available evidence. Based on an assessment of the Russian artillery officers' education and skill level, Russian artillery fire was not a very accurate assumption. The fact that they had a lot of it, combined with the officer education problem, implies to me that quantity over quality was a Russian rule of thumb, so to speak. I don't believe that you have to find a quote from the Russians to state that as a definite possibilty. The evidence points that way.