Ryan Jason Talley. "Over the hills and far away...": a study of the 95th Rifles: their background, discipline, doctrine, and combat employment during the defense of Portugal, 1810-1811. Master's Theses, 1998. iii, 102 p. :
Some additional material of possible use:
Cope. The history of the Rifle Brigade (the Prince Consort's Own) formerly the 95th. 1877. : . The history of the Rifle Brigade (the Prince Consort's Own) formerly the 95th. 1877. Cope. The history of the Rifle Brigade (the Prince Consort's Own) formerly the 95th. 1877. 624 p. : https://archive.org/details/historyofriflebr00cope
Urban, Mark, 1961-. Rifles : six years with Wellington's legendary sharpshooters. 2004. https://archive.org/details/rifles00mark
History of the 95th Rifles: https://www.95thrifles.com/history
Simmons, George; Verner, William Willoughby Cole. A British rifle man; the journals and correspondence of Major George Simmons, Rifle brigade, during the Peninsular war and the campaign of Waterloo. 1899. xxvi, 386 p. : https://archive.org/details/britishriflemanj00simm
Smith, Henry Stooks. An alphabetical list of the officers of the rifle brigade, from 1800 to 1850. 1851. 67, 8 p. : https://archive.org/details/alphabeticallist00smitrich
Raynor, Keith. Riflemen of the 95th Regiment ( Rifles ) at Corunna 1808-1809. : www.militaryheritage.com/riflemen.htm
I will be providing available download urls for the Bibliography in the original post.
Usually they used greased cloth patches, leather ones are unknown to me - at least for the Prussian and Austrian army.
Already the Hessian Jäger in the AWI used cartridges, as they adopted a cartridge box which could contain 40 of them.
In my opinion this changed due to being more and more employed also in battle other than the usual tasks of light infantry in the traditional sense.
I was under the impression that in the field mostly those pre made cartridges were used, didn't one Rifleman mention that he carried 80 of them around with him?